Multiple patterns of selectivity in superior colliculus control visual search.

Area of Science:

• Systems Neuroscience
• Cognitive Neuroscience
• Neurobiology

Background:

• Efficient visual search relies on integrating target information with past search behavior.
• The superior colliculus (SC), a midbrain structure, is crucial for controlling spatial attention and eye movements.

Purpose of the Study:

• To investigate how the superior colliculus (SC) integrates target guidance and behavioral history during multi-target visual search.
• To explore the neural mechanisms (mixed, dynamic, or pure selectivity) underlying this integration in the SC.

Main Methods:

• Monkeys performed a multi-target visual search task involving saccades to stimuli in a grid.
• Analysis of neuronal activity in the SC during the search task.
• Introduction of a novel time-series partial information decomposition analysis.

Main Results:

• Evidence found for SC neurons exhibiting mixed, dynamic, and pure selectivity patterns.
• The SC participates in circuits for target similarity, previously fixated locations, and signal integration.
• The novel analysis provided insights into neuronal representational capacity allocation.

Conclusions:

• The superior colliculus (SC) is vital for flexible cognitive control in visually-guided behavior, going beyond a simple priority map.
• SC neurons integrate multiple signals, including target salience and search history, using sophisticated neural mechanisms.
• The findings advance our understanding of how the brain controls complex visual search behaviors.