lecture 14 Flashcards
occipital lobe
function and place in the brain of the occipital lobe
vision, and posterior of brain
function of and location of V4
colour processing, sits below and behind V3, ventral
function and location of V5
motion area and lateral above occipital lobe
primary visual cortex function and location
process colour, form, and motion, surrounds the calcarine sulcus in the occipital lobe
blobs vs interblobs
blobs - colour
interblobs - cells between blobs, form and motion
makes up V1
what is the secondary visual cortex made of
thick, thin, and pale stripes
function of thick, thin, and pale stripes
thin - colour
thick - form
pale - motion
where does visual processing start
V1, then projects to V2, then to other major visual areas
the visual field can be divided into ____ (halves, thirds, quadrants, sixths)
quadrants (contralateral)
- bottom fov goes to dorsal (top) visual cortex, top fov goes to ventral visual cortex
dorsal stream is visual guidance of ____
movement, where and how stream
ventral stream is _____ perception
object and motion
Superior Temporal Sulcus is ___ perception
object and motion, ventral stream
what is the STS stream good for and why
hint: location is why
lands in secondary facial area and good for movement so its best for facial recognition in motion
V3 function
dynamic form processing, shapes of objects in motion
object agnosia
what is it and where is the damage
blindness to object categorization, damage to lateral occipital area
achromatopsia
blind to colour, only see in black and white, damage to V4
akinetopsia
blind to motion, see in stopframe, damage to MT (V5)
higher visual areas are more ____ but can still ____, whereas V1 and 2 are ____ and process ____
specialized, integrate multiple aspects, heterogenous, all types of info
dorsal stream is ____ for ____
vision for action, where and how
T/F
in the dorsal stream movement can be done without attention
True, it can be done with or without attention or awareness
processing visual info about a target in order to catch it requires interaction of multiple ____s, largely where?
visual areas, in parietal lobe and dorsal stream
action for vision example
when you look at someones face you typically focus on the parts of their face that move - the eyes and mouth
when a subject performs mental rotation they often move their eyes
primary function of vision
to guide movement, not to recognize objects
how does info from V1 get to parietal areas
the dorsal stream projects info for visually guided movements to the parietal areas
damage to the Lateral Occipital Area (LO)
can shape hand to grasp an object they cannot see
dorsal stream damage
can see objects but cannot reach for them or grab them
dorsal stream provides ____ action
real-time
when the brain is acting on visual info (not just looking at an object), what neurons are active
posterior parietal visual neurons
when asked if two faces are the same, what stream is active
ventral
when asked where on a face a dot was, what stream is active
dorsal
