Two Visual Pathways in Primates Based on Sampling of Space: Exploitation and Exploration of Visual Information

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• The visual pathway is traditionally segregated into ventral (object identity) and dorsal (location/action) streams.
• Existing models face challenges from recent evidence suggesting broader functions for each stream.
• A need exists for a unified framework that reconciles current findings.

Purpose of the Study:

• To propose a new dichotomy for visual stream function based on spatial sampling.
• To re-interpret existing neuropsychological and experimental data within this new framework.
• To provide a unified model for visual processing, multisensory integration, and sensorimotor control.

Main Methods:

• Theoretical model development based on embodied cognition principles.
• Re-evaluation of existing experimental and neuropsychological evidence.
• Bayesian framework application to multisensory integration in the dorsal stream.

Main Results:

• A proposed dichotomy: ventral stream samples high-resolution/focal space, dorsal stream samples broad space with reduced foveal bias.
• This dichotomy explains object recognition, spatial vision, and sensorimotor control functions.
• The model accounts for multisensory integration and predicts stream utilization in object recognition.

Conclusions:

• The proposed spatial sampling dichotomy offers a unified explanation for visual stream functions.
• This model integrates exploitation (ventral) and exploration (dorsal) dichotomies.
• It reconciles diverse findings and provides a foundation for future research on visual perception and action.