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khan academy mcat psych/soc Exam Questions And Correct Answers

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  • Mcat Psych/soc

©THEBRIGHT EXAM STUDY SOLUTIONS 8/22/2024 12:54 PM khan academy mcat psych/soc Exam Questions And Correct Answers Perceptual organization - answerdepth, form, motion, constantly binocular cues - answerdepth retinal disparity - answereyes are 2.5 inches apart convergence - answerdepth based o...

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  • August 28, 2024
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©THEBRIGHT EXAM STUDY SOLUTIONS 8/22/2024 12:54 PM



khan academy mcat psych/soc Exam
Questions And Correct Answers

Perceptual organization - answer✔✔depth, form, motion, constantly

binocular cues - answer✔✔depth

retinal disparity - answer✔✔eyes are 2.5 inches apart

convergence - answer✔✔depth based on how much eyes are turned, far away eyes are relaxed,
close up eyes contract

monocular cues - answer✔✔form of object, relative size, interpositoin (overlap), relative height,
shading and contour

motion parallax - answer✔✔relative motion, things farther move slower, things closer move
faster

constancy - answer✔✔perception of object doesnt change despite image on retina changing, we
are smarter, size/shape/color constancy

size constancy - answer✔✔if object is closer we dont perceive it as bigger just because its close,
we know its the same size

sensory adaptation - answer✔✔inner ear muscle (higher noise contract, to dampen vibration in
inner ear, protect ear drum)


sight: down regulation of light adaptation, when bright constrict pupils and desensitize rods and
cones, or up regulatoin, when dark dilate pupils and rods and cones synthesize light sensitive
molecules

Weber's law - answer✔✔JND= just noticeable difference
- threshold at which youre able to notice any change in sensation


- 2 vs. 2.2 weight is noticeable
dI= .1 (noticeable intensity difference)

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/22/2024 12:54 PM


linear relationship betwen threshold and intensity
I vs. dI= linear

absolute threshold of sensation - answer✔✔differences based on the individual


minimum intensity of stimulus needed to detect a particular stimulus 50% of the time


influenced by expectations, experience, motivation, alertness

subliminal stimuli - answer✔✔stimuli below the absolute threshold of sensation

somatosensation - answer✔✔intensity, timing, location


temp, pressure, pain, position

intensity - answer✔✔how quickly the neurons fire

timing - answer✔✔non-adapting= constant firing rate, temp


slow-adapting= neuron fires in beginning and calms down after a while, pressure/pain


fast-adapting= fires as soon as stimulus starts then stops firing then starts again when the simulus
stops, proprioception, and some pain

vestibular system - answer✔✔balance and orientation


inner ear= semicircular canals (posterior, lateral, anterior)


filled with endolymph to detect motion of the fluid with rotation


otolithic organs= utricle and saccule, detect linear acceleration and head positioning, calcium
carbonate crystals attached to hair cells in viscous gel, when we move they pull on hair cells and
trigger AP, depend on gravity!

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/22/2024 12:54 PM


dizziness and vertigo

Signal Detection Theory - answer✔✔how we make decision under conditions of uncertainty,
discern between importnat stimuli and unimportant "noise"


ex. if given 2 lists in psych experiment and then person asks which words came from first list,
they would be uncertain


or traffic light in the fog and can't tell

type I error - answer✔✔false positive

type II error - answer✔✔false negative

d' - answer✔✔*dick is strong= strength
hit>miss when there is a strong signal


miss > hit when there is a weak signal

c' - answer✔✔C= strategy


Celeste is always conservative


always say no unless you are 100% sure the signal is present


might get some misses


liberal strategy= always say yes even if you get false alarms

signal detection theory pt 2 - answer✔✔"noise" distribution and signal distribution


the difference between the 2 is d'

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/22/2024 12:54 PM

if signal shifted to the R, d' would be big and easy to detect


strategy C expressed via choice threshold


Beta= set value of threshold, ratio of height of signal distribution to height of noise distribution

bottom-up processing - answer✔✔begin with stimulus, data driven, always correct, inductive
reasoning


no preconceived cognition constructs of the stimulus (never seen it before)

top-down processing - answer✔✔use background knowledge to influence perception, ex. where's
waldo


theory driven, deductive reasoning


ex creating a cube image when its not there based on the tricky image

gestalt principle - answer✔✔items similar to one another are grouped together


things are reduced to their simplest form possible




ex. brain organizes them into columns of circles and squares


objects close physically together are grouped together


continuity, smooth lines


closure, objects grouped together are seen as a whole

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