WACE Flashcards
Cerebral Cortex
• Part of the forebrain (outer layer)
• Largest part of the brain, separates us from animals
• Divided into four anatomical areas (lobes)
o Frontal
o Parietal
o Occipital
o Temporal
Frontal lobe
- Personality
- Higher order processes (attention, impulse, organization etc)
- Contains the following functional areas: primary motor cortex and brocas.
Primary motor cortex
o Located at the back of the frontal lobe
o Different areas responsible for different body parts
• Laid out in the order of body parts
• Body parts involved in fine motor movement have more area dedicated to them
Broca’s
o Located on the left side of the frontal lobe o It controls; • Muscles responsible for fluent speech • Structures that understand grammatically rules o If damaged; • Speech isn’t fluent • Grammatically incorrect • However speech usually makes sense
Temporal lobe
o Contains the primary auditory cortex and Wernicke’s areas
o Responsible for creation of new memories
Primary auditory cortex
- Left hemisphere is responsible for verbal sounds
* Right hemisphere is responsible for non verbal sounds
Wernicke area
o Left side of temporal lobe o Language comprehension center- retrieves meaning of words from memory o If damaged: • Unable to understand speech of others • Unable to produce meaningful speech • Fluent gibberish
Occipital
- Contains primary visual cortex
* Responsible for vision
Primary vision cortex
- Receives visual information and transforms it
- Right to left side, left to right
- If damaged:
- Tumors
- Schizophrenia
Parietal lobe
o Contains primary sensory cortex
o Therefore responsible for sensations
Primary somatosensory cortex
- Similar layout to the primary motor cortex
- Areas which are more sensitive (mouth, fingers etc) have more area dedicated to them
- Creates meaning from raw sensory information (ie touching something that gets translated to pain)
- Damage results in:
- Problems with co-ordination, as well as sensation
- Hemi spatial neglect
- Other issues with spatial awareness
Central nervous system
- Also known as CNS
- Includes the brain and spinal cord
- Integrate and co-ordinate all in coming neural information and to initiate messages sent to different parts of the body.
- It does not have contact with the outside of the body and therefore relies on the PNS.
Spinal cord
- Passes sensory information from the PNS to the brain
* Passes motor information from brain to PNS
Peripheral nervous system
- Complete set of neurons outside the brain
- Links the central nervous system to the rest of the body
- Divided into two sections; somatic and autonomic
- Responsible for; carrying information to the CNS from the body’s muscles, organs and glands (about internal body) and from sensory organs; carry information from the CNS to the body’s muscles, organs and glands.
Somatic
- Transfer sensory information from the environment to the central nervous system
- Afferent (sensory) neurons receive information from the environment and send them inwards towards the CNS
- Efferent (motor) neurons transfer information outwards from the CNS to co-ordinate movement
- Controls voluntary muscle only
Autonomic nervous system
- Non voluntary body functions, glands, non skeletal muscles
- Unconsciousness
- Consists of the sympathetic nervous system and parasympathetic
Sympathetic nervous system
- Involved in fight or flight response
- When activated; heart rate increases, breathing rate increases, sweat glands increases, digestion decreases and pupils dilate.
Parasympathetic nervous system
- Responsible for bringing the body back to homeostasis after the sympathetic nervous system has been activated
- When activated; heart rate decreases, breathing rate decreases, sweat glands decrease and digestion increase.
Neural transmission
- Chemicals in the brain, which aid in the transmission of activity between neurons.
- Serotin and dopamine
- Neurotransmitters are created in cell body and are stored in synaptic vesicles.
- An action potential occurs and transports the vesicles down the axon.
- The neurotransmitters are released into the synapse.
- Neurotransmitter cross the synaptic cleft and attach to receptor sites on the dendrite of the post synaptic neuron
- Neurotransmitters have an inhibitory or excitatory effect, and if the action potential is strong enough, the process then continues in the next neurons.
- Excess neurotransmitters are then re-up taken to the presynaptic neuron and recycle.
o Inhibitory effect
calm neural activity balancing mood
o Excitatory effect
stimulates brain activity
Serotonin
• Regulation of mood, sleep, appetite
• Neurotransmitter
• Too little= depression,, increased appetite, sleep problems, OCD
• Too much= anorexia
• Factors influencing production:
o Antidepressants prevent the reuptake, increase the availability.
o Ecstacy increases short term decreases long term
Dopamine
- Involved in the rewards pathway and motor control
- Neurotransmitter
- Create feelings of pleasure and linked to formative of addictions
- Problems associated with balance
- Too little= Parkinson’s, Anxiety, depression
- Too much= schizophrenia
- Factors influencing production
- Alcohol and drug use
Alcohol and drug use - Physiological effect
- An effect on the body
- A change in neurotransmitters levels
- Cause psychological effects
Alcohol and drug use - Psychological effect
o An effect on the mind
o A change in behavior
o Caused by physiological effects
Hormones
- Chemical messengers created by the endocrine system
- Adrenaline and Noradrenaline
- Both produced by adrenal gland in the kidney
- Both involved in fight or flight response
Adrenaline
o Physiological o Increased heart rate o Raises blood pressure o Psychological • Anxiety • Increases alertness • Fear
Noradrenaline
o Physiological • Increased heart rate • Increases rate in muscles contracting o Psychological o Anxiety o Increase alterness o Fear
Empirical research - noradrenaline
o Mezzacappa
o Sample of male university students
o Control group injected with saline
o Experimental group injected with adrenaline
o Showed them a series of clips
o Overall, experimental group showed a more intense emotional response (measure by facial expressions)
o The experimental group also showed significally more fear during the ‘fear’ clips, no difference during ‘amusement’ and ‘anger’ clips
Psychoactive drug
• Drugs that alter the activity of the central nervous system and cause a change in behavior, thoughts and emotion
Depressant
• Psychoactive drugs which decrease activity of the CNS
• Example is alcohol
• Physiological effects include:
o Increased endorphins
o Long term decreases regulation of dopamine
o Decreases activity in the cerebral cortex
o Use in adolescence impairs the development of frontal lobe
• Psychological effects include:
o Relaxation
o Addiction
o Decrease inhabitation
o Impairment of working memory
• Empirical research:
o Tapert et al
o Sample of young women
o Experimental group were alchoholics
o Control groups were no drinkers
o Conducted FMRIs while participants completed memory tests
o Less activity was found in the frontal lobe and more performance in experimental group
Stimulant
• Psychoactive drugs which increase activity of the CNS
• Example is Ecstasy
• Physiological effects include:
o Increased heart rate and blood pressure
o Increased production of serotonin in short term
o Long term destroys neurons which create serotonin
• Psychological
o Euphoria in short term
o Depression in long term
o Decreased attention and memory
o Hallucinations
• Empirical research
o Mc Cardle
o Experimental group was long term ecstasy users
o Control group was non ecstasy users
o Conduction of memory tests and attention tests and surveys on depression level
o It was found that ecstasy users reported higher levels of depression, poor performance on attention and memory tasks
Hallucinogens
- Psychoactive drugs which cause an altered state of consciousness
- Example is ecstasy
Hereditary
• The fact that genes are passed fro parents to children
• Genotype (the genes/alleles)
• Phenotype (physical expression of genes)
• Research has indicated that our genes influence the way we blame, think and feel in several ways, including:
o Intelligence (Bouchard twin study)
o Personality
o Psychological disorders
Epigenetics
• How your environment effects how your genes are expressed, without changing your DNA.
• Research: Yehuda et al
o Did a series of studies on pregnant women who had been involved in 911 and had developed PTSD
o They had lower Cortisol levels and therefore children were born with lower cortisol levels
o 16 of the childrens genes were expressed differently compared to those with PTSD
Memory
• The storage, organization and retrieval of information.
Multi model of memory
• Created by Atkinson and Schiffiren
- Includes capacity, duration and encoding.
- Capacity is how much information can be stored in your memory.
- Duration is how log information can be stored in your memory.
- Encoding is the process of transforming sensory information into a form where it can be stored in your memory. There are four types which include:
Types of encoding - Acoustic
encoding information verbally, for example, repeating the information you are trying to process.
Types of encoding - visual
usually used for processing visual information, involves creating a mental image of the information youre trying to process.
Types of encoding - sematic
adding context or meaning to the information youre trying to process, for example, chunking information into categories.
Types of encoding - Elaborative
relating new information to old information or past experiences.
Sensory memory
- Information enters through your sensory organs.
- If you pay attention to this then it goes to your short term memory.
- Two types are Iconic and echoic.
Iconic memory
• The visual component of sesnort memory, allows you to hold on ‘icon’ which is an unprocessed image in your mind for a brief period of time.
• Structural features include
o Capacity: theoretically unlimited
o Duration: 0.2 seconds-0.4 seconds
• Research includes Sperling
o Showed participants a set of 12 letters for 0.2 seconds, he then asked them to verbally recall.
o Participants only recalled 3-4 letters.
Echoic memory
• The verbal component of sensor memory
• Structural features include
o Capacity: Theoretically unlimited
o Duration: 3-4 seconds, longer duration allows us to hear spoken language as complete words, and not individual symbols.
• Research by Cowan:
o Got participants to read a story while numbers were read aloud.
o Participants were able to recall more of the later numbers, than the earlier numbers.
o Also better recall if participants were asked to recall straight away.
Short-term memory
- The most active part of the memory, which can store a limited amount of information for a limited amount of time.
- Encoding is predominantly acoustic and some visual
- Information is transferred to long-term memory via rehearsal.
- Duration is 18-30 seconds
- Capacity: 7 pieces of information
Rehearsal
used to keep information in STM, and transfer it to LTM.
Maintenance
Passive process, which is effective at keeping simple information in the STM, for example, continuously, repeating a phone number.
Elaborative
active process which is more effective at transferring complex information to STM, involves linking new info to info already in the LTM, for example, creating memories, stories, mind maps etc.
Short term memory - Brown Peterson technique
o Experiment showed that showed without rehearsal, memory has a limited duration.
o Participants were shown a series of trigram and were then asked to count back from a specified number for a period of time before recalling trigrams.
o The counting back was meant to prevent rehearsal
o The longer the participants had to count back, the less trigrams they could recall- less than 10% after 18 seconds.
o After that time, the information ‘decayed’ out of short term memory as it wasn’t being rehearsed
Short term memory -• Research: Glazner and Cunitz
o Presented participants with a series of numbers, and then asked them to recall them.
o Found that participants recalled more of the earlier numbers (receny effect) compared to the middle.
o If participants had to wait more then 30 seconds before recalling, the serial position effect disappeared.