Perception Flashcards
When does aud percept start
In womb! can recognize mom voice/nativization for language starts with intonation
prefer with higher sucking/heart rate slow
important to screen for deafness
High-amplitude sucking
suck hard until habituated, suck hard if new stim is surprising
Visual habituation
same as sucking but with looking time
Condition Headturn
train with speaker to side, reward if turn, test stimuli (do they turn?)
Neuroimgaing
byproducts of neural firing
EEG/NIRS/fMRI
Visual acuity at birth
Really bad, bad contrast/color
gets good at 8mo ish
3 days olds Can recognize mom if got experience of looking at her
Testing visual acuity
grading acuity/vernier acuity
25x worse than adults
Optokinetic nystagmus - reflex for tracking
Why poor optics at birth
Retina has few cones rn
Neural network NEEDS PATTERNED INPUT TO DEVO
Orientation/motion direction local and global need input to devo
Color vision
Newborns see red vs gray, green at 1mo, basics at 3mo
Need to be intense diffs, pastels don’t work
Depth in infants
yes they can percieve depth
looked longer at novel sized cube (same retinal image as close small one)
Stereopsis
first at 3.5 mo, rapidly improves after
Prob from OCULAR DOM. COLUMNS DEVELOPING
Abnormal visual devo
Strabismus - misalignment, causes amblyopia (lazy eye)
Over time, brain favors good eye leading to no stereopsis
Need to intervene early to get brain to readjust bad eye (eyepatch/video games using both eyes)
Visual devo needs input
Devo depends on experience
Cats raised in horizontal environment had exquisite tuning to hor. orientation, poor vert.
Intermodal perception
Babies could put together touch and vision sense (lumpy object vs smooth, look at what felt)
Can translate between sense
Fetuses learn!
Patterened input
