AUDITORY-CORTEX IN GREY SQUIRREL - TONOTOPIC ORGANIZATION AND ARCHITECTONIC FIELDS
AUDITORY-CORTEX IN GREY SQUIRREL - TONOTOPIC ORGANIZATION AND ARCHITECTONIC FIELDS
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DOI：
10.1002/cne.901660402
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发表时间：
1976-01-01
影响因子：
2.5
通讯作者：
ROTH, GL
中科院分区：
文献类型：
--
作者：
MERZENICH, MM;KAAS, JH;ROTH, GL
用微电极标测技术研究了灰松鼠听觉皮层内声音频率的表征。检查了映射的皮质表面的细胞和骨髓结构，并与记录数据相关。根据生理学和解剖学标准定义主要视野。它占据了松鼠近一半的听觉反应区域。在垂直穿透初级视野活跃的中皮质层(S)内，神经元的最佳频率相对恒定。在主场内定义了190赫兹-33千赫范围内的最佳频率。声场内的声音频率(和耳蜗区)有一个有序的表示，最低频率表示在吻部，最高频率表示在尾部。一个给定的频带(基底区的扇区)横跨一条宽度大致恒定的大致笔直的皮质带，横跨初级视野的内侧维度。能量场内较高频率倍频程的表面积相应较大。在不同的松鼠中，主场的位置和主场内频率表征的方向存在显著差异。在至少2个二次听野内记录听觉反应。根据Kaas等人的定义，对音调刺激作出反应的整个区域大致对应于前颞区。
The representation of sound frequency within auditory cortex was investigated with microelectrode mapping techniques in grey squirrels [Sciurus carolinensis]. The cyto- and myeloarchitecture of mapped cortical surfaces was examined and related to recording data. A primary field was defined on the basis of both physiological and anatomical criteria. It occupied nearly half of the auditory responsive area in the squirrel. The best frequency of neurons was relatively constant within vertical penetrations across the active middle cortical layer(s) of the primary field. Best frequencies ranging from 190 Hz-33 kHz were defined within the primary field. There was an orderly representation of sound frequency (and of the cochlear partition) within the field, with lowest frequencies represented rostrally and highest frequencies represented caudally. A given frequency band (sector of the basilar partition) was represented across a roughly straight belt of cortex of approximately constant width that crosses the medio-lateral dimension of the primary field. There was a proportionately greater surface area of representation of higher frequency octaves within the field. In different squirrels, there was significant variation in the location of the primary field and in the orientation of the frequency representation within it. Auditory responses were recorded within at least 2 secondary auditory fields. The total region responsive to tonal stimulation approximately corresponded with the anterior temporal field, as defined by Kaas et al.