Vision for perception and vision for action in the primate brain

Area of Science:

• Neuroscience
• Evolutionary Biology
• Cognitive Science

Background:

• The evolution of visual systems predates 'sight,' initially serving motor control.
• Primate vision has evolved into two distinct processing streams.

Purpose of the Study:

• To elucidate the dual functions of visual processing streams in primates.
• To differentiate the roles of the dorsal and ventral visual streams.

Main Methods:

• Analysis of primate cerebral cortex visual processing pathways.
• Examination of dorsal and ventral stream projections and functions.

Main Results:

• The dorsal stream (primary visual cortex to posterior parietal cortex) controls motor acts.
• The ventral stream (primary visual cortex to temporal lobe) supports cognitive operations.
• Both streams process object structure and spatial location, modulated by attention.

Conclusions:

• The dorsal stream uses egocentric reference frames for moment-to-moment action control.
• The ventral stream forms enduring object representations for cognition.
• Coordinated action between both streams enables goal-directed behavior.