Visual System - UAB School of Optometry
... ‘BLINDSIGHT’: preservation of very limited ability to perform visually guided tasks after destruction of the retina to LGN to cortex pathway, in the apparent absence of conscious perception. Bottom line: take out the LGN-cortical system and you are for all practical purposes completely blind. Les ...
... ‘BLINDSIGHT’: preservation of very limited ability to perform visually guided tasks after destruction of the retina to LGN to cortex pathway, in the apparent absence of conscious perception. Bottom line: take out the LGN-cortical system and you are for all practical purposes completely blind. Les ...
Check out figures to understand this tricky wiring pattern… After
... • Neurons in different parts of the brain are responsive to different aspects of the stimulus (= do different things). ...
... • Neurons in different parts of the brain are responsive to different aspects of the stimulus (= do different things). ...
After leaving the retina, the outputs of each eye are split
... • Bars of light must be oriented correctly, but can appear anywhere in the receptive field • Moving the bar through the field produces a sustained response • Complex cells often show direction-selectivity: – they fire more when the bar moves in one direction, and are suppressed by motion in the oppo ...
... • Bars of light must be oriented correctly, but can appear anywhere in the receptive field • Moving the bar through the field produces a sustained response • Complex cells often show direction-selectivity: – they fire more when the bar moves in one direction, and are suppressed by motion in the oppo ...
Visual Field and the Human Visual System
... PET Activations of Word vs. Nonword Stimuli Brain shows much greater activation as subjects look at visual words (2nd row) than when they view a static fixation point (top row). ...
... PET Activations of Word vs. Nonword Stimuli Brain shows much greater activation as subjects look at visual words (2nd row) than when they view a static fixation point (top row). ...
Visual Awareness - People.csail.mit.edu
... our present knowledge of the visual system. The first is how much we already know—by any standards the amount is enormous… The other surprising thing is that, in spite of all this work, we really have no clear idea how we see anything.” ...
... our present knowledge of the visual system. The first is how much we already know—by any standards the amount is enormous… The other surprising thing is that, in spite of all this work, we really have no clear idea how we see anything.” ...
Visual pathways cortical and sub
... inability to reach for food in slots of different orientation Electrophysiological studies in monkeys 1970s Mountcastle & Hyvarinen electrophysiological recordings from dorsal stream neurons neurons that fire during reaching neurons firing during saccades towards stationary objects neurons respondin ...
... inability to reach for food in slots of different orientation Electrophysiological studies in monkeys 1970s Mountcastle & Hyvarinen electrophysiological recordings from dorsal stream neurons neurons that fire during reaching neurons firing during saccades towards stationary objects neurons respondin ...
Blue= rods Green = Cones
... • V1 appears to be organized into modules • Each module receives input from both eyes about one small part of the visual field • Input from each eye is separated into “ocular dominance columns” within the module • CO Blobs: color and low spatial frequency • Outside of CO Blobs: orientation, movement ...
... • V1 appears to be organized into modules • Each module receives input from both eyes about one small part of the visual field • Input from each eye is separated into “ocular dominance columns” within the module • CO Blobs: color and low spatial frequency • Outside of CO Blobs: orientation, movement ...