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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Neuronal basis for evaluating selected action in the primate striatum.

Hiroshi Yamada¹, Hitoshi Inokawa, Naoyuki Matsumoto

¹Department of Physiology, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan. hyamada@nyu.edu

The European Journal of Neuroscience

|July 26, 2011

Summary

The striatum represents action values and task strategies, crucial for decision-making. Neuronal activity in the striatum encodes outcome feedback and guides adaptive search or repeat behaviors.

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Area of Science:

Neuroscience
Cognitive Science
Behavioral Economics

Background:

Decision-making involves evaluating action outcomes and predicting rewards.
Behavioral norms like rules and strategies also govern choices.
The striatum is a key brain region where value, rule, and strategy signals converge.

Purpose of the Study:

To investigate the role of the striatum in value- and strategy-based decision-making.
To examine how target values and task strategies are represented in striatal neuronal activity.
To understand the neural mechanisms underlying adaptive choice behavior.

Main Methods:

Recorded striatal neuronal activity in macaque monkeys during a trial-and-error reward search task.
Monkeys performed a task involving target selection, reward acquisition, and repeated choices.
Analyzed neuronal responses related to outcome feedback, chosen actions, and adaptive strategies (search/repeat).

Main Results:

Substantial portions of striatal neurons encoded positive and negative outcome feedback.
Signals related to chosen actions, their values, and search/repeat actions were modulated and persisted.
Specific neuronal populations showed tonic activity increases reflecting adapted task strategies (win-stay-lose-switch).

Conclusions:

The striatum exhibits a heterogeneous representation of decision variables.
These neural signals contribute to the reinforcement- and strategy-based evaluation of actions.
Findings illuminate the striatum's role in complex decision-making processes.