Lecture 27 Flashcards
simple cells
have clearly defined regions1
complex cells
do not have clearly defined regions
ocular dominance columns
vertical comuns in area V1
organized in in an inter digitized “left-priming” and right-priming” manner
orientation columns
vertical columns in area V1 whose orientation preferences changes in a regular manner until all possible orientations are represented
each column is sensitive to input from ______ and respond to ______
same eye
similar orientation
Hubel and Wiesel suggested
that one pair of ocular dominance columns including all orientation columns represents one discrete module called hyper column essentially processes info from a particular location in space
intrinsic optical imaging
shine a constant amount of light onto the brain and then record amount of light reflected, improve access by drilling or scraping skull
use subtractive images
red=active
optical imaging
each colour represents a group of neurons activated my a specific orientation
organized like a radial pinwheel fashion
thick bands represent ocular dominance bands
dark= left
light= right
what are blobs
in V1 process colour
how do you see blobs
cytochrome oxidase staining
how do we investigate properties of cortical neurons
using adaptation
the tilt after effect
adaptation to a pattern at a given orientation
adaptation to spatial frequency
We need more contrast in order to see spatial frequencies we could see before
Where are the neurons that encode adaptation?
inputs rom the two eyes do not converge until V1, adaptation must happen in cortical neurons
High-frequency channels tell us about
detail
