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J Neurophysiol (October 18, 2006). doi:10.1152/jn.00689.2006
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Submitted on July 4, 2006
Accepted on October 13, 2006

A New Field with Tonotopic Organization in Guinea Pig Auditory Cortex

Masataka Nishimura1, Hiroshi Shirasawa2, Hiroyuki Kaizo3, and Wen-Jie Song1*

1 Department of Sensory and Cognitive Physiology, Kumamoto University, Kumamoto, Japan
2 Division of Electrical, Electronic, and Information Engineering, Osaka University, Suita, Japan
3 Division of Electrical, Electronic, and Information Engineering, Osaka University, Suita, Japan; Suita, United States

* To whom correspondence should be addressed. E-mail: song{at}ele.eng.osaka-u.ac.jp.

In guinea pig auditory cortex, two core areas, a primary area (AI) and a dorsocaudal field (DC), and two belt regions ventral to AI and DC (VRB and VCB) with an intermediate zone (T) in between, together with a small field (S) rostral to AI, have been reported in single electrode studies, although field S and zone T have not been observed in imaging studies. Using a high-resolution in vivo optical imaging system with the voltage-sensitive dye RH-795, here we report the successful imaging of a rostral small field and zone T and a ventral-to-dorsal frequency gradient in zone T. Further, we found that VRB can be subdivided into two areas, a ventrorostral field (VR) with properties similar to those reported for VRB, and a ventrocaudal field (VC) with novel properties. With increasing stimulus tone frequency, activation in VR shifted caudally while activation in VC shifted rostrally. Thus we have newly identified field VC that has mirror-symmetric tonotopy to that of VR.




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