Psych And Soc Flashcards
What does the hind brain consist of?
The cerebellum, medulla oblongata, and reticular formation
What are the components of the midbrain?
Inferior and superior colliculi
What are the components of the forebrain?
Thalamus Hypothalamus Basal ganglia Lambic system Cerebral cortex
What are the methods of studying brain activity?
EEG electroencephalogram and regional cerebral blood flow
What is the function of the thalamus?
It is a relay station for sensory information
** except smell
What is the function of the hypothalamus?
Maintains homeostasis and integrates with the endocrine system through the hypophyseal portal system that connects it to the anterior pituitary
What is the function of the basal ganglia?
Smoothness movements and helps maintain postural stability
What is the function of the limbic system? And what does it contain?
Contains septal nuclei amygdala and hippocampus
Controls emotion and memory
What are the septal nuclei a part of and what is it involved in?
It’s a part of the limbic system
Involved with feelings of pleasure, pleasure-seeking behavior, and addiction
What is the amygdala a part of and what does it do?
A part of the limbic system
Controls fear and aggression
What is the hippocampus a part of and what does it do?
It’s a part of the limbic system
It consolidates memories an communicates with other parts of the limbic system through the fornix
What part of the brain communicates with other parts of the limbic system through an extension called the fornix?
The hippocampus
The cerebral cortex is divided into four lobes, what are the lobes?
Frontal lobe
Parietal lobe
Occipital lobe
Temporal lobe
What does the frontal lobe control?
Executive function
Impulse control
Long-term planning
Motor function
Speech production
What does the parietal lobe control?
Sensations of touch, pressure, temperature and pain
Spatial processing
Orientation
Manipulation
What does the occipital lobe control?
Visual processing
What does the temporal lobe control?
Sound processing
Speech perception
Memory
Emotion
The brain is divided into two hemispheres, left and right. Which hemisphere is dominant hemisphere for language?
The left hemisphere
Which nervous systems is acetylcholine used in and what does it tend to do in those systems?
Used by somatic nervous system: to move muscles
The parasympathetic nervous system: dominant neurotransmitter in this system
The central nervous system: for alertness
What is the function of dopamine and where are high concentrations usually found?
Plays an important role in movement and posture
High concentrations of dopamine are normally found in the basal ganglia
What is associated with imbalances in dopamine transmission?
Schizophrenia
*** the dopamine hypothesis of schizophrenia argues that delusions , hallucinations, and agitation associated with schizophrenia arise from either too much dopamine or from an oversensitivity to dopamine in the brain
What disease is associated with a loss of dopamergic neurons in the basal ganglia?
Parkinson’s disease
What are the neurotransmitters further classified as catecholamines? And what is the role of the catecholamines?
Dopamine
Epinephrine
Norepinephrine
Play an important role in the experience of emotions
Neurotransmitters are classified as monoamine or biogenic amine neurotransmitters?
Serotonin
Dopamine
Epinephrine
Norepinephrine
What role does serotonin play?
Plays a role in regulating mood, eating, sleeping, and dreaming.
What neurotransmitters play a role in depression and mania?
Norepinephrine
Serotonin
What happens when serotonin is oversupplied? Undersupplied?
Oversupplied: thought to produce manic states
Undersupplied: thought to produce depression
What is the function of GABA? And how does it exerts its effects?
Produces inhibitory post synaptic potentials
Plays a role in stabilizing neural activity in the brain
Exerts its effects by causing hyperpolarization of the postsynaptic membrane
What is the function of glycine as a neurotransmitter? And how does it exert its effects?
An inhibitory neurotransmitter in the CNS
Exerts its effects by increasing chloride influx into the neuron to hyperpolarize the postsynaptic membrane
What is the function of glutamate?
It acts as an excitatory neurotransmitter in the CNS
Opposite function of glycine
What is the function if endorphins and enkephalins?
Acts as natural painkillers
What is the function of GABA and Glycine?
Act as brain stabilizers
What hormone is a stress hormone that is released by the adrenal cortex?
Cortisol
What are the functions of testosterone and estrogen? Where are the released and what other places can they be produced?
Mediate libido
Testosterone increases aggressive behavior
Both are released by the adrenal cortex
Testes can produce testosterone
Ovaries can produce estrogen
What are the functions of norepinephrine and epinephrine? What secretes them?
Wakefulness and alertness
Mediate fight or flight response
The adrenal medulla
What reflexes exist in infants and should disappear with age?
Primitive reflexes
What is a rooting reflex?
When an infant turns his head toward anything that brushes their cheek
What is the Moro reflex?
The infant extends the arms, then slowly retracts them and cries in response to a sensation of falling
What is the babinski reflex?
The big toe is extended and the other toes fan in response to the brushing of the sole of the foot
What is the grasping reflex?
The infant grabs anything put into his or her hand
What do photoreceptors respond to?
Electromagnetic waves in the visible spectrum
Sight
What do hair cells respond to?
Movement of fluid in the inner ear structures
Hearing, rotational and linear acceleration
What do Nociceptors respond to?
Painful or noxious stimuli
Somatosensation
What do osmoresceptors respond to?
The osmolarity or blood (water homeostasis)
What do olfactory receptors respond to?
Volatile compounds
Smell
What is absolute threshold?
The minimum intensity at which a stimulus will be transduced (converted into action potentials)
What is the absolute threshold for normal human hearing?
10^-12 W/m^2
What is the just noticeable difference fro sound frequency?
.68 percent (3 Hz / 440 Hz)
jnd is 3 Hz.
*** MCAT questions typically will focus on applying a ratio
What law has to do with the jnd?
Weber’s Law
What does the signal detection theory focus on?
Changes in our perception of the same stimuli depending on both psychological and environmental context
What does signal detection allow us to explore?
Response bias
What does response bias refer to?
The tendency of subjects to systematically respond to a stimulus in a particular way due to nonsensory factors
What is adaptation?
Detection of a stimulus changing over time
What part of the retina contains only cones and is the center most point?
Fovea
From the optic chasm, the information goes to several different places in the brain. What are those places?
The lateral geniculate nucleus of the thalamus
Through radiations in the temporal and parietal lobes to the visual cortex in the occipital lobe
Inputs into the superior colliculus (which controls some responses to visual stimuli and reflexive eye movements)
What is parallel processing?
The ability to simultaneously analyze and combine information regarding color, shape, and motion.
Then these features can be compared to our memories to determine what is being viewed
What is an example of parallel processing involved with cars?
Most people can recognize a moving car very easily from a distance because they are familiar with the usual motions and shapes of cars
What type of cells detect shape? And what do they consist of?
Parvocellular cells which have:
very high color spatial resolution which permits us to see very fine detail when thoroughly examining an object
Low temporal resolution so can only work with stationary or slow-moving objects
What cells specialize in motion detection?
Magnocellular cells
What are the components of the outer ear?
Pinna or auricle
External auditory canal
What are the components of the middle ear?
Tympanic membrane
The ossicles (malleus, incus, and stapes)
Inner ear sits within a bony labyrinth which contains what?
Cochlea
Vestibule
Semicircular canals
The structures of the inner ear are continuous with each other and are mostly filled with what? And what is the potassium-rich fluid that it is bathed with?
Membranous labyrinth
Bathed with endolymph
The cochlea is divided into three parts called scalae that run the entire length of the cochalea. What does the middle scale house?
The actual hearing apparatus, the organ of Corti
The Organ of Corti is the actual hearing apparatus which rests on a thin, flexible membrane called the basilar membrane. What is the organ of Corti composed of?
Thousands of hair cells which are bathed in endolymph
What structures of the ear are sensitive to linear acceleration, so are used as part of the balancing apparatus and to determine one’s orientation in 3D space?
The utricle and saccule
The vestibule a portion of the bony labyrinth that contains the urticle and saccule
What do the urticle and saccule contain and how to they work?
Modified hair cells covered with otoliths
As the body accelerates, these otoliths will resist that motion which bends and stimulates the underlying hair cells, which send a signal to the brain
What component of the ear is sensitive to?
Rotational acceleration
The semicircular canals are arranged perpendicularly to each other and each ends in a swelling called the ______, where ___________ are located
Ampulla, where hair cells are located
Describe the auditory pathways in the brain
Most information passes through the
Vestibulocochlear nerve —–> brain stem —–> medial geniculate nucleus of the thalamus—-> auditory cortex in the temporal lobe for sound processing
What other places can sound be sent to? And what do these places do with the sound?
Superior olive: localized the sound
Inferior colliculus: involved in the startle reflex and helps keeps the eyes fixed on a point while the head is turned
What is somatosensation and what are the four modalities of it?
Often reduced to taste
Modalities are
- pressure
- vibration
- pain
- temperature
What type of receptor responds to deep pressure and vibration?
Pacinian corpuscles
What type of receptors respond to light and touch?
Meissner corpuscles
What type of receptors respond to stretch?
Ruffini endings
What type of receptors respond to pain and temperature?
Free nerve endings
What is a two-point threshold?
The minimum distance necessary between two points of stimulation on the skin such that the points will be felt as two distinct stimuli
When temperature is judged relative to physiological zero, when does an object feel cold? Warm? What is physiological zero?
Cold because it is under physiological zero
Warm bc it is above Physiological zero
Physiological zero is the normal temperature of the skin (between 86 and 97 degrees F)
What is the gate theory of pain?
Special gating mechanism that can turn pain on or off, affecting whether or not we perceive pain
Explains why rubbing an injury seems to reduce the pain of the injury
What is the kinesthetic sense? Where are their receptors found?
Called porprioception
Refers to the ability to tell where ones body is in space
Receptors are found mostly in muscles and joints and play a critical role in hand eye coordination balance and mobility
What is bottom up processing? And what is another name for it?
Refers to object recognition by parallel processing and feature detection.
The brain takes the individual sensory stimuli and combines them together to create a cohesive image before determining what the object is
Also called data-driven processing
What is top down processing and what is another name for it?
Is driven by memories and expectations that allow the brain to recognize the whole object and then recognize the component s based on these expectations
What does bottom up processing allow us to do?
Allows us to discriminate slight differences between similar objects
***less prone to mistakes
What does top-down processing allow us to do?
Allows us to be efficient at recognizing objects
W/o it , it would be like we are looking at thing s for the first time each time we saw them
***more prone to mistakes
How is the form of an object usually determined?
Through parallel processing and feature detection and through the motion perceived by the magnocellular cells
What do gestalt principles do?
They are ways fro the brain to infer missing parts of a picture when a picture is incomplete
What are the gestalt principles?
Proximity
Similarity
Good continuation
Subjective contours
Closure
What is th law of proximity ?
Elements close to another tend to be perceived as a unit
What is the law of similarity ?
Objects that are grouped together tend to be similar
What is the law of good continuation?
Elements that appear to follow in the same pathway tend to be grouped together
There is a tendency to perceive continuous patterns in stimuli rather than abrupt changes
What is the law of pragnanz
Gesalt prinicples are governed by it
Says that perceptual organization will always be as regular, simple, and symmetric as possible
What is the visual pathway from the eye?
Eye—> optic nerves—> optic chiasm —-> optic tracts—> lateral geniculate nucleus of he thalamus—> visual radiations (run though the temporal and parietal lobes) —> the visual cortex in the occipital lobe
How are all senses processed?
Parallel processing
How is the middle ear connected to the nasal cavity?
Euchstachian tube
What is classical conditioning?
An unconditioned stimulus that produces an instinctive, unconditioned response is paired with a neutral stimulus
With repetition the neutral stimuli becomes a conditioned response
What is operant conditioning?
Changed through the use of consequences
- reinforcements
- punishments
What part of operant conditioning increases the likelihood of the behavior? And what part of it decreases the likelihood of a behavior?
Increases: reinforcement
Decreases: punishment
What is observational learning and what is another name for it?
The acquisition of behavior by watching others
Another name for it is modeling
What is explicit memory and what is another name for it?
Declarative memory
Stores facts and stories
What is implicit memory and wat is another name for it?
No declarative memory (procedural memory)
Stores skills and conditioning effects
How are facts stored?
Via semantic networks
What is responsible for the conversion of short term memory to long term memory ?
Long term potentiation
What is the difference between negative reinforcement and positive punishment?
Negative reinforcement is the REMOVAL of a bothersome stimulus to ENCOURAGE a behavior
Positive punishment is the ADDITION of a bothersome stimulus to REDUCE a behavior
What is negative punishment ?
The reduction of a behavior when a stimulus is removed