Convergence of processing channels in the extrastriate cortex of monkeys.
The first (V-I) and second (V-II) visual areas of primates contain three types of anatomical segregations of neurons as parts of hypothesized "P-B" or "color", "P-I" or "form," and "M" or "motion" processing channels. These channels remain distinct in relays of P-B and P-I information to the inferior temporal lobe via V-II and dorsolateral visual cortex for object recognition, and "M" information to posterior parietal cortex via the middle temporal visual area (MT) for visual tracking and attention. The present anatomical experiments demonstrate another channel where "P-B" modules in V-I and "P-B" and "M" modules in V-II merge in the projections to the dorsomedial visual area (DM), which relays to MT and posterior parietal cortex. This integrative area may function in unifying our perception of the visual world, and may allow "color" as well as "motion" to play a role in visual tracking and attention.
Krubitzer
L
L
Department of Psychology, Vanderbilt University, Nashville, TN 37240.
Kaas
J
J
D000818:Animals; D001029:Aotus trivirgatus; D003118:Color Perception / Q000502:physiology; D006735:Horseradish Peroxidase; D009039:Motion Perception / Q000502:physiology; D014793:Visual Cortex / Q000033:anatomy & histology / Q000502:physiology*; D014795:Visual Pathways / Q000033:anatomy & histology / Q000502:physiology*; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins
D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins; D006735:Horseradish Peroxidase