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PSY1005 - Sensation and Perception > Neuroscience and Behaviour > Flashcards

Neuroscience and Behaviour Flashcards

1
Q

What do neurons consist of?

A
  • Dendrite - tree
  • Cell body - soma
  • Axon - myelin
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2
Q

Diagram of neuron

A
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3
Q

What are gilal cells?

A

Support cells

Cells that support the functionality of neurons by providing physical support, supplying nutrients and enhancing neuronal communication

Very important in brain function

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4
Q

Where are gilal cells found?

A

central nervous system (brain and spinal cord)

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5
Q

What does synpase do?

A

electrical signal (the action potential) into a chemical signal in the form of neurotransmitter release, and then, upon binding of the transmitter to the postsynaptic receptor, switching the signal back again into an electrical form

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6
Q

What are the three major neuron types?

A

–sensory

–motor

–interneurons/relay

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7
Q

What are neurons?

A

Cells in the nervous system that communicate with one another to perform information-processing tasks

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8
Q

What is cell body other name as?

A

Soma

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9
Q

What is cell body?

A

Largest component of the neuron

Coordinates the information-processing taska dn keeps the cell alive

Functions such as protein synthesis, energy production and metabolism take place here

Contains nucleus which has chromosomes contains DNA/genetic bllueprint

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10
Q

What is the cell body surrounded by?

A

Porous cell membrane that allows molecules to flow into and out of the cell

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11
Q

What are the two types of specialised extensions of the cell membraneto allow communication?

A

Axons and dendirtes

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12
Q

What are the dendrites?

A

Recieve information from other neurons and relay it to the cell body

Many dendrites that look like tree brances

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13
Q

What are axons?

A

Transmit information to other neurons, muscles or glands

Each neuron has a single axon that sometimes can be very long

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14
Q

What are axons covered by?

A

Myelin sheath

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15
Q

What are myelin sheath?

A

Insulating layer of fatty material made up of glial cells

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16
Q

Advantages of myelin seath

A

When axons insulated with myelin it can more efficiently transmit signals to other neurons, organs or muscles

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17
Q

What happens in demyelinating disease e,g multiple sclerosis

A

Myelin sheath deterioates causing a slowdown in the transmission of information from one neuron to another

Variety of problems such as loss of feeling in limbs, partial blindess and difficulties in corrdination

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18
Q

What is synapse?

A

Junction or region between the axon of one neuron and the dendrites or cell body of another

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19
Q

Who discovered the neurons?

A

Cajal

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20
Q

What are sensory neurons?

A

Receive information from the external world and convey this information to the brain via the spinal cord

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21
Q

How are sensory neurons specialised?

A

Specialised endingson their dendrites that recieve signals fro light, sound ,touch , taste and smell

e.g sensory neurons’ endings are sensitive to light

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22
Q

What do motor neurons carry?

A

Signals from the spinal cord to the muscles to produce movement

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23
Q

How are motor neurones specialised?

A

Long axons that can stretch to muscles at our extremeities

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24
Q

What are interneurons?

A

Connect sensory neurons, motor neurons or other interneurons

Carry information from sensory neurons into the nervous system , others carry info from nervous system o the motor neurons

Perform variety of information-rpocessing functions within the nervous system

Work together to perform simple tasks e.g identifying location of sensory signal, recognising a familiar face

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25
Q

What are Purkinje cells?

A

Interneuron that carries information from the cerebellum to the rest of the brain and spinal cord

Dense,elaborate dendrites that resemble bushes

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26
Q

What are pyramidal cells?

A

Found in the cerebral cortex

Triangular cell body and single long dendrite among many smaller dendrites

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27
Q

What are biploar cells?

A

Type of sensory neuron found in the retinas of the eye

Have a single axon and few dendrites

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28
Q

Diagram of purkinje cell , hippocampal pyramidal and biploar cell

A
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29
Q

Our thoughts, feelings and action depend on neural communication but how does it happen?

A

Communication of information within and between neurones go in two stage

conduction and trasmission

conduction - conduction of electrical signal over relatively long distances within neurons from dendrites to cell body throughout axon

Transmission - electrical signal between neurons over the synapse

these are electrochemical action of neurones

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30
Q

Neurons have an natura electrical change called what?

A

Resting potential

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31
Q

What does resting potential mean?

A

Difference in electric charge between the inside and outside of neuron’s cell membrane

–natural electric charge

–concentration of ions inside and outside cell

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32
Q

How does the resting potential arise?

A

From difference in concentrations of ions inside and outside the neuron’s cell membrane

Ions carry + or -charge

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33
Q

Resting potential

sodium and potassium ion gradient

How this test shows differences in K+ concern is basis of resting potential

A
  • Resting state: High con of K+ inside neuron compared to low K+ outside neuron
  • Raising K+ in fluid outside neuron to match conc of K+ inside causing resting potential to disappear
    *
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34
Q

Resting potential

sodium and potassium ion gradient

A

The concentration of K+ inside and outside an axon controlled by axon membrane that allow molecules to flow in and out of the neuron

Resting potential Chanells allow K+ molecules inside the neuron so K+ molecules move out neurons through the open channels leaving the inside of the neuron with charge of -70 millivolts to outside

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35
Q

Conduction of large electrical impulse down the length of axon

What is this called?

A

Action potential

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36
Q

What is an action potential?

A

Electrical signal that is conducted along the length of a neuron’s axon to the synapse

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37
Q

When does action potential occur?

A

Only when electric shock reaches a certain level or threshold

Change in state of axon’s membrane

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38
Q

What happens when an electric shock is below this threshold?

A

Researchers recorded only tiny signals which dissipated rapidly

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39
Q

What happens when the shock reaches the threshold?

A

A much larger signal the action potentia, onbserved

Did not increase the strength of action potential

occurs same magnitude regardless of whether stimulus is at or above threshold

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40
Q

What is the myelin sheath?

A

Made up of glial cells

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41
Q

The axons end in what?

A

Terminal buttons

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42
Q

What are terminal buttons?

A

Knoblike structures that branch out from an axon

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43
Q

What are the terminal buttons filled with?

A

Tiny vesicles that contain neurotransmitter

Neurotransmitter - transmit information across the synapse to a receiving neuron dendrites

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44
Q

What do dendrites of the recieving neuron contain?

A

Receptors - part of the cell membrane that receive neurotransmitters and initiate new electric siignal

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45
Q
A
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46
Q

How would dendrites know which of the neurotransmitters flooding to the synpase to reiceve and which to ignore?

A
  1. Neurons tend to form pathways in the brain that are characterised by specific types of neurotransmitters; one neurotransmitter might be prevalent in one part of the brain and other may be prevalent in a different oart
  2. Neurotransmitter and receptor act like lock and key model. bind to receptor specificlly.
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47
Q

What happens to the leftover neurotransmitter left in the synpase after chemical message is relayed to postsynaptic neuron?

Three processes where neurotransmitter leave the synapse

A
  • Reputake occurs when neurotransmitters are reabsorbed by the terminal buttons of the presynaptic neuron axon
  • Neurotransmitters can be destroyed by enzymes in synapse in process called enztme deactiviation where specific enzymes bind to receptor sites called autoreceptor on presynaptic neurons
  • Autoreceptors detect how much of a neurotransmitter has been released into a synpase and signal the neuron to stop releasing the neurotransmitter when excess is in process
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48
Q

What is acetlycholine (ACh)

A

Neurotransmitter involved in a number of functions including voluntary motor colour

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49
Q

Diagram of neurotransmitter and functions

A
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50
Q

How can drugs affect the nervous sytem?

A

Increasing , interfering with or mimicking the manufacture or function of nuerotransmitters

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51
Q

What are agonists?

A

Drugs that increase the action of a neurotransmitter

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52
Q

What is anatagonists?

A

Drugs that block the function of a neurotransmitter

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53
Q

Agonists vs Antagonists?

A

Drugs alter a step in production or release neurotransmitter

Whereas others have a chemical structure so similar to a neurotransmitter that the drug is able to bind to neuron receptor

If bind to receptor, drug activates neurotransmitter agonist

If blocks the action of the neurotransmitter it is antagonist

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54
Q

Diagram of agonist vs antagonist

A
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55
Q

More information on L-dopa

A
  • Developed to treat Parkinsons movement disorder characteristced by terms and difficulty to initiate momvent caused by loss of neurons that use the neurotransmitter dopamine
  • Dopmaine is created by amount of L-dopa in the brain and spur the surviving neurons to produce more dopamine
  • L-dopa is an agonist for dopamine
  • Effectiveness of L-dopa decreases when used over a long period of time
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56
Q

Evidence for central role of dopamine to regulate movement and motor performance

1982 study

A
  • 6 people ranging from age (25-45) from San Franciso Vay admitted to emergency rooms with symptoms: paralysis, drooling and inability to speak
  • Diagnoise of Parkinson was made
  • Unusal for 6 people to have Parkinson this young with advanced at the time at same area
  • None had Parkinson but were heroin addicts
  • They thought they were ingesting a synthetic form of heroin MPPP but instead ingested derivative called MPTP effect of destroying dopamine producing neurons in brain crucial for motor performance
  • Recovery recieeving L-dopa acts agonist by enhancing properties of dopamine
  • Drugs like MPTP act as antagonists destryoing dopamine producing neurons
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57
Q

How can Amphetamine alter neurotransmitter function

A

Stimulates release of noradrenaline and dopamine

Both amphetamine and cocaine prevent the reuptake of noradrenaline and dopamine

Combination of increased release of noradrenaline and dopamine and prevention of their uptake flood synapse with neurotransmitter resulting increased activation of their receptor

Both drug strong agonist

Noradrenanline and dopamine play role in mood control either neurotransmitter result in euphoria, wakefulness and burst of energy

However, noradrenaline increase heart rate

Overdore of amphetamine or cocaine cause heart to contract so rapidly that heartbeats di not last long to pump blood effectively leading to fainting and sometimes to death

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58
Q

How does Prozac work?

A

Drug used to treat depression e.g agonist

Blocks the reuptake of neurotransmitter serotonin (drug is elective sertonin reuptake inhibiter SSRIS)

Depression have reduced levels of serotonin in brain

Blocking reuptake more of the neurotransmitter reminas in synapse longer and produces great activation of sertonin receptor

Help elevate mood relieve depression

59
Q

What is beta blockers

Antagonist?

A

Obstruct a receptor site for noradrenaline in heart

Noradenline cannot bind to receptor heart rate slows down which is helpful for disorders which heart beats too fast or irreguarly

Prescribed to reduce agitation , racing heart and nervousness associated with stage fright

60
Q

What is nervous sytem?

A

Interacting network of neurons that conveys electrochemical information throughout the body

61
Q

What are the two major divsions of the nervous system?

A
  1. Central Nervous System CNS
  2. Peripheral Nervous System PNS
62
Q

What is CNS?

A

Composed of brain and spinal record

Recieve sensory information from the external world, processes and coordinates this information and sends commands to the skeletal and muscular system for action

Rests the brain which contain sutrctures that support complex perceptual, motor, emotional and cognitive functions of the nervous sytem

Spinal cord branches down from the brain; nerves process sensory information and relay commands to the body connect to the spinal cord

63
Q

What is PNS?

A

Connects the central nervous system to the body’s organ and muscle

Composed of two major subdivisions

64
Q

What are subdivsions of PNS?

A
  • Somatic nervous system
  • Autonomic nervous system
65
Q

What is somatic nervous system?

A

Set of nerves that convey information in and out of CNS

Humans have conscious control over this system and use it to perceive, think and coordinate behaviours

e.g pick up coffee cup involves elegantly orchestrated activities of somatic nervous system

info from receptor in eye travels to brain registering cup from table

signals from your brain travel to arm and hand

Feedback from muscles tells your brain that cup has been grasped

66
Q

What is ANS Autonomic nervous system?

A

Set of nerves that carry involuntary and automatic commands that control blood vessels, body rogans and glands

System works on its own to regulate bodily system and largely outside conscious control

67
Q

What is ANS two major subdivisions?

A
  1. Sympathetic nervous system
  2. Parasympathetic nervous system
68
Q

What is sympathetic nervous system?

A

Set of nerves that prepare the body for action in threatening situations

Nerves emanate from top and bottom of spinal cord and connect to variety fo organs such as eyes, salivary glands, heart and lungs, digestive organs and sex organis

Coordinate control of these organs so body can take action by fleeing the threating situation/ prepare fight of flight

69
Q

Sympathetic nervous sytem

e.g fight or flight

A
  • Hear footsetps behind you in a dark ally
  • Feel frightened and turn to see someone approaching you from behind
  • Dilates pupils to let in more light, increases your heart rate and respiration to pump more oxygen to muscles
  • Diverts blood flow to brain and muscle to activate sweat glands and to cool body
  • Converse energy Sympathetic nervous system inhibit salivation and bowel movement and immune responses and suppresses to pain and injury
  • Likelhood to deal threat on ground or making escape
70
Q

What does parasympathetic nervous system help?

A

Body to return to nomral resting state

e.g Far away from attacker body doesn’t need to remain on red alert and kick in reverse effects of the sympathetic nervous system and return the body to a normal state

Mirror connection of the sympathetic nervous system

e.g parasympathetic constricts your pupils and slows down heart rate and respiration

diverts blood flow to your digestive system and decreases activity in your sweat gland

71
Q

How do synpathetic and parasympathetic nervous system coordinate to control many bodily functions

e.g Sexual behaviour

A
  • In men the parasympathetic nervous system enorges the blood vessels of the penis to produce an erection
  • However, sympathetic nervous system is responsible for ejacuation
  • In women: parasympathetic nervous system produces vafinal lubritication but sympathetic nervous system underlies orgasm
72
Q

How do synpathetic and parasympathetic nervous system coordinate to control many bodily functions

e.g Sexual behaviour

Men and women successful suxal experience depends on balance of two systems

anxiety about sexual performance disrupt this balance

e.g

A
  • Sympathetic nervous system activation caused by anxiety can lead to premature ejaculation in males and lack of lubrication in females
73
Q

Connections between sensory inputs and motor neurons in the spinal ord mediate what?

A

Spina reflexes

74
Q

What are spinal reflexes?

A
  • Simple pathways in the nervous system that rapidly generate muscle contractions
75
Q

Example of using spinal reflexes

A

If you touch a candle flame, the sensory neurons that register pain and send inputs directly into the spinal cord

Through a few synaptic connections within the spinal cord, interneurons relay these sensory inputs to motor neurons that connect to your arm muscles and direct you to quickly retract your hand

76
Q

What could happen to elaborate tasks?

A

Collabration of spinal cord and the brain

Peripheral nervous system communicates with CNS through nerves that conduct sensory info into the brain carry commands out of the brain or both

Brain sends commands for voluntary movement through the spinal cord to motor neurons whose axons project out to skeletal muscles and send message to contract

77
Q

What happens if spinal cord is damaged?

A

Severs the connection from the brain to the sensory and motor neurons that are essential to sensory perception and movement

78
Q

Location of spinal injury often determine the

A

extent of abilities are lost

different regions of spinal cord control different systems of the body

79
Q

What happens with paitents with damage at particular level of spinal cord?

A

Lose sensation of touch and pain in body parts below of the level of injury as well as loss of motor control of muscles in same area

80
Q

What happens if higher area of spinal cord is damaged?

A

Usually predicts a more poorer pognosis such as quadriplegia (loss of sensation and motor control over all limbs)

breathing through a respirator and lifelong immobility

81
Q

Where is the hindbrain?

A

Follow spinal cord from your tailbone to where it enters your skull you will find it difficult to determine where your spinal cord ends and brain begins

because spinal cord is continuous with hindbrain

82
Q

Definition of hindbrain

A

Area of the brain that coordinates information coming in and out of the spinal cord

83
Q

What is the hindbrain sometimes known as?

A

Vrain stem

84
Q

What does the hindbrain control?

A

Most of the basic functions of life:

respiration

altertness

motor skills

85
Q

What does the three antaomical structures include in hindbrain?

A
  1. Medulla
  2. Cerebullum
  3. Pons
86
Q

What is the medulla?

A

Extension of the spinal cord into the skull that coordinates heart rate, circulation and respiration

87
Q

What does the medulla inside?

A

Small cluster of neurons called reticular formation

88
Q

What is reticular formation?

A

Brain structure that regulates sleep, wakefulness and levels of arousal

89
Q

What happens if the reticular formation is damaged?

A

Large consequences of behaviour

E.g Researchers stimulated recticular formation of sleeping cat

Caused animal to awaken almost instantouesly and remain alert

However, serving connections between this and rest of brain caused animal to relapse into a coma

90
Q

Where is the cerebullum located?

A

Behind the medulla

91
Q

What is the cerebullum?

A

Large structure of the hindbrain that controls fine motor skills

Orcherstates proper sequence of movement when e.g riding bike, playing piano

92
Q

What does the cerebullum contain?

A

Layer of Purkinje cells

Largest neurons in the brain and sole output for motor coordination and orginating the cerebellum and spreading it to the rest of the brain

93
Q

What happens if the cerebellum is damaged?

A
  • Produces impairment in coordination and balance
  • NOT paralysis or immobility
  • Role in crebullum as contributes to fine tuning of behaviour rather than initiation of bheaviour
94
Q

What is pons?

A

Structure that relays information from the crebullum to the rest of the brain

Acts as relay station or bridge between the cerebellum and other structures in the brain

95
Q

Where is midbrain?

A

Sitting ontop of the hindbrain

96
Q

What two structures do the midbrain contain?

A

Tectum and tegmentum

97
Q

What is the tectum?

A

Orients an organisim in envirnoment

Recieve stimulus input from eyes, ears and skin and moves organism in a coordinated way to stimulus

e.g when studying in quiet room and hear click behind and to the right of you, body swivel and orient to the direction of the sound

98
Q

What is tegmentum ?

A

Involved in movement and arousal and helps organism orient towards sensory stimuli

abundance of dopamine producing neurons found in midbrain structure

dopamine contributes to motor , behaviour, motivation and pleasure

seretonin also contributes to mood

99
Q

How to survive with only hindbrain and midbrain?

A

Structures in hindbrain would take care of all the boduily functions necessary to sustain life

Structures in midbrain would oreint you towards or away from pleasuring or threatening stimuli

100
Q

What is the forebrain?

A

Highest level of the brain

Controls complex cognitive, emotional, sensory and motor functions

Forebrain divided into main sections :crebral cortex and subcortical structures

101
Q

What is cerebral cortex?

A

Outermost layer of the brain visibile to the naked eye and divided into two hemispheres

102
Q

What is subcortical structures?

A

Areas of the forebrain housed under the cerebral cortex near the very centre of the brain

103
Q

What is the thalamus?

A

Relays and fitlers information from the senses and transmits the information to the cerebral cortex

Recieves inputs from all the major senses expect smell which has direct connections to the cerebral cortex

Closes pathway of incoming sensations during sleep, providing valuable function is not allowing information to pass to rest of the brain

104
Q

What is hypothalamus?

Below thalamus

A

Regulates body temperature, hunger, thrist and sexual behaviour

Overseas wide range of behaviours

e.g make sure body temp, blood sugar levels and metabolism kept within an optimal range

105
Q

What happens if there is lesions in hypothalamus?

A

Result in overeating whereas ther areas leave animal no desire for food at all

106
Q

e.g sex

hypotalhalamus role

A

Messages from cerebral cortex are sent to hypothalamus to release hormones

107
Q

Electrical stimulation in cats prduce

A

e.g hissing and biting

when hypothalamus can also produce intense pleasure for an animal

108
Q

What did James Olds and Peter Milner found?

A

Small electric current delivered to certain region of rat’s hypothalamus was extremely rewarding for the animal

When allowed to press bar attached to electrode to initiate their own stimulation

Rats do it repeatedly to point of exhausation

Therefore, hypothalamus in charge of behaviour: fighting, fleeing, feeding and mating

109
Q

Where is pituarity gland located?

A
  • Below hypothalamus
110
Q

Definition of pituarity gland

A

Master gland of the body’s hormone producing system

Releases hormones that direct functions of many other glands in the body

Hyothalamus sends hormone signals to pituarity gland and sends hormonal signals to other glandsto control stress, digestive activities and reporductive process

e.g when baby suckles on its mother;s breast sensory neurons in breast send signals to her hypothalamus then piturarity gland to release hormone oxytocin into blood stream to release milk

111
Q

How is pituaritty gland related to stress?

A
  • When we sense a threat
  • Sensory neurons send a singal to the hypothalamus which stimulates release of ACTH hormone from the pitruarity gland
  • ATCH stimulates adrenal glands (above kidneys) to release hormones that activate sympathetic nervous system
112
Q

The hypothalamus is part of limbic system what doesn’t that mean?

A

Group of forebrain structures which also include the amygdala and the hippocampus which are involved in motivation, emotion, learning and memory

113
Q

What does the limbic system form?

A

Boundary where subcortical structures meet the cerebral cortex

Two remaining structure of limbic system are hippocampus and amygdala

114
Q

What is the hippocampus?

A

Critical for creating new memories and integrating them into a network of knowledge so that can be stored indefinitely in other parts of cerebral cortex

115
Q

What if people damage their hippomcapus?

A

Acquire new information and keep it in awareness for few seconds but forgot

116
Q

What is amygdala?

A

Located at the tip of each horn of hippocampus

plays central role in many emotional process particular the formation of emotional memories

Attaches to significance to previously neural events that are associated with fear, punishment and reward

117
Q

Example of amygdala

A

A car came speeding towards you as you cross the road

Stimuli car - don’t have a panic attack each time

Emotional connection to events e.g fearful

118
Q

What is basal ganglia?

A

Set of subcortial structurs that direct intentional movements

located near the thalamus and hypothalamus and they receive inputs from the cerebral cortex and send outputs to the motor centres in the brain stem

119
Q

One part of the basal ganglia is the striaum involved in what?

A

Control of posture and movement

120
Q

Paitents suffering from Parkinsons

A

Show symptoms of uncontrollable shaking and sudden jerks of the limbs and unable to initiate a sequence of movements to achieve a specific goal

Happens because dopamine-producing neurons in the substantial nigra are damaged

Undersupply of dopamine then affects the striatum turns to visible behavioural symptoms

121
Q

Is the cortex highest level of brain?

A

Yes

Responsible for complex aspects of perception, emotion, movement and thought

122
Q

What is the smooth surface of the cortex called?

A

Gyri

123
Q

Identation or fissures of brain are called?

A

Sulci

124
Q

Cerebral cortex can be understoof by three levels?

A

Separation of the cortex

Two hemispheres

Function of each hemisphere

Role of specific cortical areas

125
Q

First level of organisation in cerebral cortex

A

Dvided cortex into left and right hemispheres

They are symmetrical

Each hemisphere controls the function of the opposite side

126
Q

What does contralateral control mean?

A

Right cerebral hemisphere percieves stimuli from and controls movement on the left side of your body

Whereas left cerebral hemisphere perceives stimuli and controls movement on the right side of body

127
Q

What are cerebral hemispheres connected by?

A

Commisures

Bundle of axons that mkae connuncation between parallel areas of the cortex in each half

Half o the commissions is corpus callosum

Info received in right hemisphere e.g pass along corpus callosum and registered virtually instanteously in left hemisphere

128
Q

What is corpus callosum?

A

A thick band of nerve fibres that connect large areas of the cerbral cortex on each side of the brain and supports communication of information across the hemispheres

129
Q

The second level of organisation

A

Cerebral cortex distinguishes the functions of different regions within each hemisphere

Each hemisphere is divided into four areas or lobes from front to back

130
Q

Where is occitpal lobelocated at?

A

Back of the cerebral cortex

Processes visual information

Sensory receptor in eyes send info to thalamus which turns info to primary areas of occiptal lobe where simple features of the stimulus are extracted

Proceed to complex map of stimulus onto occital cortex leading to comprehension of what is being seen

131
Q

What happens if occipital lobe is damaged?

A

Person with partial or complete blindless

Info still enter eyes which are functioning as normal

But without the ability to process and make sense of information at the level of cerebral cortex the information is as good ad lost

132
Q

What is parietal lobe?

A

Located at the front of the occipital lobe

Carries out functions that include processing information about touch

Contains somatosensory cortex (outer layer of pariteral lobe containing representation of the body)

Each part of somatosensory cortex maps onto particular part of body

If body area is more sensitive larger part of somatosensory cortex is deovated to it

e.g part of samtosensory cortex that corresponds to lips and tongue is larger than area for feet

133
Q

What does motor cortex initiate?

A

Voluntary movememnts and sends messages to basal ganglia , cerebellum and spinal cord

Motot and somatosensory corticies are sending and receiving areas of the cerebral cortex taking in information and sending out commands as the case might be

Type of premotor neuron seems to be capable to more socially relevant coordination for communication

Around one in ten neurons in motor cortex classified as mirror neurons

134
Q

What are mirror neurons?

A

Cells that are active when performing an action onself or when observing the same action performed by another

discovery have neural basis for how we imitate and copy each other - important social skills

135
Q

Where it temporal lobe located?

A

Lower side of each hemisphere

Responsible for hearing and language

Auditory cortex in temporal lobe is analogous to somatosensory cortex in parietal lobe and primary visual areas of the occpital lobe

Recieves sesnory information from ears based on frequencies of sounds

Secondary areas of the temporal lobe then process info into useful units e.g speech and words

Temporal lboe house the visual association areas that interpret the meaning of visual stimuli and help us recognise common objects in the environment

136
Q

Frontal lobe sits behind the forehead

Has specialised areas for movement, abstract thinking, planning, memory and judgement

A

Contains motor cortex which coordinate thought processes that help us manipulate information and retrieve memories which we can use to plan our behaviours and interact socially with others

Frontal cortex allows u to do the kind of thinking, imagining and planning that sets humans apart from most species

137
Q

Third level of organisation in cerebral cortex involves representation of information within specific lobes in the cortex

Hierarchy of processing stages from primaryareas handling fine details of information all the way up toassociation areas

composed of nueorns that help provide sense and meaning to information registered

e.g

A

Primary visual cortex

Outermost layer of the occital lobe area where visual information is processed are highly specilaised

detect features of enivnroment that are in horizontal orientation others detect movement and still process information about humans vs nonhuman forms

138
Q

What is primary auditory cortex?

A

Outermost layer of temporal lobe where auditory information is processed and register sound frequences

association areas of temporal lobe that allow you to turn to noises

139
Q

Neurons in the association areas are usually less specialised and

A

more fliexibile than neurons in primary areas

Shaped by learning and experience to do their job more effectively

This kind of shaping of neurons by environmental forces allow the brain flexibility or plasicity

140
Q

What is not fixed in brain?

A

Sensory cortices

Adapt to changes in sensory inputs

a quality researcher called plasticity ability to be molded

Functions assigned to certain areas of the brain may be capable of being resigned to other areas of brain to accommodate changing input from envirnoment

Suggests sensory inputs compete for representation in each cortical area

141
Q

Example of plasicity

A
142
Q

Phantom limbs and brain plasicity

A
  • Limb amputated many paitents feel sensations where missing limb would be - phantom limb syndrone
  • Feel missing limb moving and some report pain in their limb
  • Evidence suggest that phantom limb syndrome arise due to plasticity in brain
  • Experiment: Researchers stimulated skin surface in various regions around face, torso and arms while monitoring brain activity in amputees and control
  • Scan displayed somatosensory cortical areas activated when skin was stimulated
  • Allowed researchers to map how touch represented in somatosensory cortex for different area of the body
  • e.g face touched, determine areas in somatosensory cortex most active
  • Brain scans of amputees relevaed stimulating areas of face and upper arm activated area in somatosensory cortex that is previously would be activated by missing hand
  • Face and arm were represented in somatosensory cortex in area adjcaent to person’s ahdn now amputated
  • Stimulating face or arm produced phantom limb sensations in amputees reported feeling sensation in missing limb
  • Brain plasticity explain findings
  • Cortical representations for face and upper arm normally lie on either side of the representation for hand
  • Somatosensory areas for face and upper arm larger in amputees and had taken over the cortex normally representing hand
  • New face and arm representations now adjacent to each other filling space occupied by hand representations
  • Some of these new mappings ere concise
  • e.g specific areas of facial skin activated in amputees, patient reported sensation in one finger of phantom limb
  • Research suggests brain plasticity adaptive process and established new mappings led to novel sensations
143
Q

Plasiciity doesn’t only componestate for missing digits or limbs e.g violinists

A

Asymmetry in their motor and somatosensory cortex with greater activity for the region that represents left hand more dexterous than right hand

144
Q

Asymmetry absent in non-musicians and appears to be related with movement

A

Similar findings with quilt makers who have highly developed areas for thumb and forefinger

Critical to their performance and taxi divers

Overdeveloped brain areas in hippocampus that are used during spatial navigation

Studies of rats and non human animals indicate that exercise such as this increases the no of synpases and promotes the development of new neurons in the hippocampus

PSY1005 - Sensation and Perception (7 decks)

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