Lecture 8: Vision and the Brain Flashcards
The left half of our visual world is processed by the right visual cortex and vice versa for the right half of our world
Net Effect
The first of the cortical regions to receive and process information and also the best-understood portion of the visual cortex
Primary Visual Cortex or V1
V1 neurons that respond to stimuli with particular orientations to objects within their receptive field
Simple Cells
V1 neurons that respond to stimuli with movement and directionally selective
Complex Cells
Neurons in V1 are selective to the orientation of ______
Lines/Bars
When cells respond more strongly to stimulation of one eye versus the other
Ocular Dominance Columns
When neurons become active local blood flow to those brain regions ______
Increases
Capture functional changes in the brain caused by neuronal activity by measuring the differences in magnetic properties between oxygenated and deoxygenated blood
fMRI
Neurons in _____ are selective to specific patterns and shapes
V4
The idea that there would be a neuron so specific it would only respond to the sight of your own grandmother
Grandmother Neuron Hypothesis
Why was the grandmother neuron hypothesis debunked?
Insufficient, our concepts outnumber our neurons
Visual pathway that leads to the parietal cortex and tells us where an object is in space
Dorsal
Visual pathway that leads to the temporal cortex and tells us what an object is
Ventral
The _____ stream appears to be important for encoding how things are moving through space
Dorsal
Arises due to damage to the parietal cortex (dorsal stream), patients have difficulty reaching for objects but can tell you about the object they are reaching towards
Optic Ataxia
