Functional coupling between target selection and acquisition in the superior colliculus

Area of Science:

• Neuroscience
• Systems Neuroscience
• Behavioral Neuroscience

Background:

• Goal-directed behaviors require animals to select, move toward, and acquire spatial targets.
• The superior colliculus (SC) is a key brain region involved in movement selection and initiation.
• It remains unclear how SC circuits link target selection with successful movement termination (acquisition).

Purpose of the Study:

• To investigate the hypothesis that SC circuitry couples target selection and acquisition.
• To determine if SC neuronal activity during target selection contributes to a motor plan for acquisition.
• To elucidate the neural mechanisms underlying goal-directed spatial behaviors.

Main Methods:

• Electrophysiological recordings from mouse superior colliculus (SC) neurons during a spatial choice task.
• Optogenetic identification of GABAergic neurons involved in target selection.
• Activity recordings from rostral and caudal SC regions.
• Computational modeling using an attractor network to simulate SC circuitry dynamics.

Main Results:

• Choice-predictive SC neurons, including GABAergic neurons, showed increased activity during movement toward the selected target.
• Rostral SC neurons exhibited higher activity than caudal SC neurons during target acquisition.
• An attractor model demonstrated that caudal SC activity related to target selection could generate observed rostral SC activity patterns during acquisition.

Conclusions:

• SC functional circuitry provides a mechanism for coupling target selection and acquisition.
• Choice-related activity in the SC may generate a default motor plan for successful target acquisition.
• This study elucidates a key neural circuit mechanism for goal-directed behavior in unpredictable environments.