ch 4 - visual cortex and beyond Flashcards
feature detectors
neurons that fire to specific features of a stimulus
simple cortical cell
neuron in the visual cortex that responds best to bars of a particular orientation
complex cortical cell
a cell in the visual cortex that responds best to a bar of a particular size and orientation anywhere within a particular area of the visual field
end stopped cortical cell
cell that responds to corners, angles, or bars of a particular length moving in a particular direction
retinotopic map
two dimensional representation of the retinal image in the neurons of the primary visual cortex
cortical magnification
the percentage of cortex that is dedicated to a particular area of the visual field.
why does cortical magnification occur?
There is more space in the cortex devoted to some sensory receptors than others.
what pathway (temporal/ventral stream)
Neural pathway Responsible to determine the object’s identity
where pathway (parietal/dorsal stream)
responsible for determining the object’s location
akinetopsia
inability to see objects in motion
what happens when the temporal lobe tissue was removed in the monkey experiment
resulted in problems with the OBJECT discrimination task
what happens when the parietal lobe tissue was removed in the monkey experiment
resulted in problems with the LANDMARK discrimination task, monkeys couldnt locate the object
why is object perception challenging?
- The stimulus on the receptors is ambiguous (Inverse projection problem)
- objects can be hidden or blurred
- objects look different from different viewpoints (viewpoint invariance)
inverse projection problem
an image on the retina can be caused by an infinite number of objects
viewpoint invariance
the ability to recognize an object regardless of the viewpoint
