Vision Flashcards
What shape are the receptive fields in the retina?
Circular
What do the receptive fields of the retina project to?
The lateral geniculate
How is V1 arranged?
In cortical modules (columns)
- Oriented to one point in visual space (shape, color, movement)
- One column for each eye
What are the subunits of the cortical modules of vision? Which is the functional unit?
Blobs (functional unit)
Interblobs
Which stream is the where pathway, and which is the what pathway?
Dorsal: Where
Ventral: What
What structures make up the dorsal stream of vision?
Parietal lobe
Striatum
What is the MT portion of the dorsal stream’s function?
Visual perception of motion
What is the MST portion of the dorsal stream’s function?
Neuronal response to complex motion-sensitive properties
What is the general function of the dorsal stream of vision?
- Visual coordinates
- Spatial orientation
What structures form the ventral stream of vision?
Striatum
Temporal lobe
What is the function of the ventral stream?
Puts information together to form object (colro, shape, name)
What is the function of V4?
- Afferents from blob and interblob areas
- Shape and color perception
What is the function of IT?
- Visual perception/ memory
- Force
- Faces
- Name and recognition of objects
What can result form a lesion of IT?
Prosopagnosia
can’t recognize faces even though vision is normal
What percentage of fibers of vision project to the autonomic nervous system? What is their function?
20 %
- Arousal
