Funke K
Institut für Tierphysiologie, Ruhr-Universität, Bochum, Federal Republic of Germany.
Exp Brain Res. 1989;76(3):603-19. doi: 10.1007/BF00248917.
Two somatosensory regions in the pigeon's telencephalon were investigated electrophysiologically with recordings of field potentials as well as single- and multi-unit responses which were evoked by electrical stimulation of all four extremities or by feather movements produced with airpuffs or by hand. The outline of both areas, was studied in detail with the use of grid-like recordings of single or multi-units. One somatosensory area is located rostrally in the hyperstriatum accessorium (HA), rostral to the visual "Wulst". A caudal area comprises the medial aspects of two different cell layers: the neostriatum intermedium (NI) and adjacent neostriatum caudale (NC) as well as the overlying hyperstriatum ventrale (HV). The two areas differ considerably in their response characteristics. Field potentials of the NI/NC-HV area were more complex than those of the HA area and their shapes and latencies varied mainly in dependence of the recording site (NI, NC, HV). Multi-unit responses showed strong excitation and short latencies in NI/NC and weak excitation and longer latencies in HV. Both responses and latencies were uniform in the HA area and latencies generally longer than in NI/NC but shorter than in HV. The HA area processes somatosensory information more specifically. Its neurons have relatively small receptive fields which seem to be arranged in a somatotopic order in such a way that rostral parts of the body are represented superficially and caudal parts in deeper layers. In contrast, the NI/NC-HV area was found to be largely multimodal, receiving also auditory and visual information. Neurons in this region have large somatic receptive fields, often including one and sometimes even both sides of the body surface. A somatotopic arrangement could not be recognized. The whole body surface was representated in both areas, but there was a dominance of wing and back receptive fields in the NI/NC-HV area and leg and neck receptive fields in the HA area.
采用记录场电位以及单单元和多单元反应的方法，对鸽子端脑的两个体感区域进行了电生理学研究。这些反应是通过电刺激鸽子的四肢、用吹气或手动产生的羽毛运动诱发的。利用单单元或多单元的网格状记录详细研究了这两个区域的轮廓。一个体感区域位于上纹状体副核（HA）的前部，在视觉“Wulst”的前方。一个尾侧区域包括两个不同细胞层的内侧部分：新纹状体中间部（NI）和相邻的新纹状体尾部（NC）以及上方的腹侧上纹状体（HV）。这两个区域的反应特征有很大差异。NI/NC-HV区域的场电位比HA区域的更复杂，其形状和潜伏期主要取决于记录部位（NI、NC、HV）。多单元反应在NI/NC区域表现出强烈的兴奋和较短的潜伏期，在HV区域表现出较弱的兴奋和较长的潜伏期。HA区域的反应和潜伏期较为一致，潜伏期通常比NI/NC区域长，但比HV区域短。HA区域处理体感信息更为特异。其神经元具有相对较小的感受野，这些感受野似乎以躯体定位的方式排列，使得身体的前部在浅层代表，后部在深层代表。相比之下，发现NI/NC-HV区域在很大程度上是多模态的，也接收听觉和视觉信息。该区域的神经元具有较大的躯体感受野，通常包括身体表面的一侧，有时甚至包括两侧。无法识别出躯体定位排列。两个区域都代表了整个身体表面，但在NI/NC-HV区域中翅膀和背部的感受野占优势，在HA区域中腿部和颈部的感受野占优势。
