Transcript Binocular neurons

How do we see in 3 dimensions?
STEROVISION
Retinal Disparity
 Objects that are far or near project slightly
different images on our retinas.
 This creates “retinal disparity”, which
provides clues to distance.
To Achieve Stereovision, Our Eyes Must Converge on a Point
Convergence point
Positive disparity
The Convergence Point and Disparity
Positive disparity
Convergence point
HOW DOES THE BRAIN PROCESS
THE IMAGES FROM THE TWO
RETINAS?
Visual aferences
Ocular Dominance Columns
Orientation
specificity
Eye
specificity
Ocularity of Neurons in V1
 Monocular neurons respond to the activity of
one eye, either the right eye or the left eye.
 Binocular neurons respond to the
simultaneous activity of both eyes.
Monocular Neurons
Activated by one eye only
Example is left eye monocular neuron
LGN
LGN
Inactive
Active when left eye is stimulated
Binocular Neurons
Stimulating only one eye is not sufficient to activate
LGN
LGN
Inactive
Inactive
Binocular neuron
Activated only when both eyes are stimulated
LGN
Active!
The right and left eyes project to
different adjacent regions of the visual cortex:
Ocular dominance columns
Left
Right
Left eye closed
Visual Cortex
Formation of Ocular Dominance Depends on Activity