Abstract
Representation of the best frequencies (BFs) was studied by a tungsten microelectrode method in the auditory cortex of Wistar-strain rats (200–350 g) anesthetized with Nembutal (40 mg/kg of initial and 5 mg/kg/h of supplement doses). BFs of 0.5–63 kHz were represented in the auditory cortex concentrically, with high BFs in the center and low BFs in the periphery. From the tonotopic representation, this area can be separated into two areas: the primary auditory area (AI) (posterior half), and the anterior area (A) (anterior half). However, the response latency distributions in these areas (6–14 ms were not significantly different. Other smaller areas with concentrations of high BFs were located anteroventrally (AV) and posterodorsally (PD) to the main area (AI and A). The response latencies of the neurons in AV and PD (12–24 ms) were significantly longer than those in the main area. Sixty-seven percent of the 33 tuning curves obtained from the neurons in the main area were closed (showing nonmonotonic intensity functions); 33% were open; 55% were multi-peaked; and 45% were single-peaked.
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