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The Journal of Neuroscience, December 12, 2007, 27(50):13750-13755; doi:10.1523/JNEUROSCI.2693-07.2007

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Brief Communications
Neuronal Activity Related to Reward Size and Rewarded Target Position in Primate Supplementary Eye Field

Yusuke Uchida,^1 * Xiaofeng Lu,^1,2 * Shogo Ohmae,¹ Toshimitsu Takahashi,^1,2 and Shigeru Kitazawa^1,2

¹Department of Neurophysiology, School of Medicine, Juntendo University, Bunkyo-ku, Tokyo 113-8421, Japan, and ²Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan

Correspondence should be addressed to Dr. Xiaofeng Lu, Department of Neurophysiology, Juntendo University School of Medicine, 2-1-1 Bunkyo-ku, Hongo, Tokyo 113-8421, Japan. Email: riku{at}med.juntendo.ac.jp

Several areas of the macaque brain are known to be related to the reward during the performance of saccadic eye-movement tasks. Neurons in the supplementary eye field (SEF) have been reported to be involved in the prediction and detection of a reward. We describe a group of neurons in the SEF that became active during the period of reward delivery after saccades toward a specific direction, but showed weaker activity in other directions, although the same amount of reward was given in each direction. Moreover, this directional reward activity was modulated by the reward size. Our results demonstrate that the SEF cells may reflect both reward amount and target positions toward which a movement was rewarded, and suggest that they may play an important role in providing information about the value of each saccade according to the spatial target location.

Key words: saccadic eye movement; reward amount; directional bias; motivation; monkey; neural activity

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Received June 14, 2007; revised Oct. 7, 2007; accepted Nov. 2, 2007.

Correspondence should be addressed to Dr. Xiaofeng Lu, Department of Neurophysiology, Juntendo University School of Medicine, 2-1-1 Bunkyo-ku, Hongo, Tokyo 113-8421, Japan. Email: riku{at}med.juntendo.ac.jp

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