FORM AND SPATIAL PERCEPTION

Question 1

perception of form

Answer 1

Neurons in the striate cortex are sensitive to spatial frequency.
these neurons send info to area V2 then to ventral stream and extrastriate cortex

Question 2

what occurs when the extrastriate cortex is damaged?

Answer 2

visual agnosia= inability to identify common objects by sight, can still read
this indicated reading involves different areas of the brain

Question 3

What is the lateral occipital cortex?

Answer 3

this is part of the ventral stream that responds to a wide variety of shapes and objects

Question 4

prosopagnosia

Answer 4

inability to recognise faces

linked to damage of the fUSI-FORM FACE AREA (ffa) LOCATED IN THE TEMPORAL LOBE BASE

Question 5

what did Carlson and Brikett find?

Answer 5

25% of the cerebral cortex is devoted t the visual system

Question 6

how does the striate cortex contribute to perception of spatial location and perception of orientation

Answer 6

mot neurons in the striate cortex are bincoluar meaning they respond to visual stimulation of either eye and contribute to the perception of depth
binocular vision provides vivid perception of depth through stereopsis

orientation= neurons in straite cortex are sensitive to orientation- neurons fire at a different rate depending on how an object is orientated

Question 7

how do we determine distance of objects?

Answer 7

retinal disparity= each eye sees 3d scenes differently and in different locations

Question 8

what does the dorsal stream do?

Answer 8

important in spatial perception
primary role is to direct movement

Damage to dorsal stream= unable to determine distance of objects

Question 9

Bilateral damage to medial temporal area=

Answer 9

inability to percieve movement
this is called akinetopsia (motion blindess)
you see a series of still images instead of smooth movement
they can see still images well