PSY 200: Visual Imagery
20 Cards in this Set
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visual imagery
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the mental invention or recreation of an experience that in at least some respects resemble the experience of actually perceiving the object or event
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there is some debate over whether mental representations are analog (___) or propositional (___)
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visual
verbal
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Kosslyn's Size Experiment
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picturing an elephant and a bunny or a bunny and a fly
the amount of time it takes you to respond about a detail of an imagined picture depend on the size of that image
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Kosslyn's Map Experiments
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memorize significant features of a map
reaction time has a linear relationship with the distance away an object was that Kosslyn told them to shift their attention to
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alternative view: propositional codes
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based on nodes and verbal descriptions
more nodes will make RT longer
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Finke's visual field/activity experiment
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method: measure visual acuity for actual or imagined grating at different eccentricities
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Brook's Interference in an Imagery: two types of cognitive tasks
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visually based = F* showed quickly on screen then they ask you to visually move astrix clockwise around letter and say yes if the corner is at the extreme top or bottom of the letter
language based = hear a sentence, start at the beginning of sentence and respond yes for each word that…
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Brook's Interference in an Imagery: two types of responses
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visually based = point to the 'Y' or 'N'
language based = say "yes" or "no"
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the same neuron can be excited for __
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perception and imagery
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multi-voxel pattern analysis (MVPA)
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feed each trial's entire set of voxel activations into a pattern classifier (machine learning algorithm).
train the machine to differentiate patterns that equal shoes from those that equal chairs
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basic-level objects
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stimuli: multiple images
test if fMRI activity patterns can successfully classify objects, in same vs. opposite visual field
bird or dog
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subordinate-level object categories
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doberman vs terrior
pigeon vs dove
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stokes, thompson, cusack, duncan
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1) classify letters seen
determine brain activity to determine what letter person was looking at
2) image a letter you hear
brain is scanned and compared with the perceptual task to determine what they were thinking of
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we can tell what people are imagining from activity of ___
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visual "what" pathway
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serences
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method: delayed match to sample; do MVPA during delay or after trial is over (ITI)
task: remember the orientation of the grating or the color
if you're suppose to remember the orientation it can classify the thing you're holding but not color, and vise versa
once you're done you can't…
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imaging uses some parts of brain as ___
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perception
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visual neglect
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people with right parietal lobe damage who deny seeing the left half of the world
if you have them draw a clock they only draw the right side
if you show them a burning house only on the left side and ask them if they would stay there they say "no" and when you ask why they say "I don't…
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areas are active during ___ along with reality
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hallucinations
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how is imagery different from perception?
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order of activation and relative strength of different brain areas may be different
also imagery relies or recreating an experience from memory
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mental images are __
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not like photographs
no detail: penny example
initial encoding effects the images we create
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PSY 200: Visual Imagery