Godde B, Hilger T, von Seelen W, Berkefeld T, Dinse H R
Institut für Neuroinformatik, Theoretische Biologie, Ruhr-Universität Bochum, Germany.
Neuroreport. 1995 Dec 29;7(1):24-8.
We measured reflectance changes by means of optical imaging of intrinsic signals to study the topography of the paw representations in rat somatosensory cortex. Following circumscribed tactile stimulation of single digits or pads, we found large and partially overlapping areas of reflectance changes (delta R). The diameters of their focal zones defined at 75% maximal delta R were in the range of 150 microns and preserved all details of the underlying maps. Zones of overlap were in the range 15-25% measured at half-maximal delta R. In contrast, we found sharp boundaries with no overlap between the fore- and hindpaw representations. The data suggest that large and overlapping cortical maps constitute a normal type of neural representation supporting the idea of a distributed neural processing scheme.
我们通过对内在信号进行光学成像来测量反射率变化，以研究大鼠体感皮层中爪部表征的地形图。在对单个趾或垫进行局限性触觉刺激后，我们发现了反射率变化（ΔR）的大区域且部分重叠。在75%最大ΔR处定义的其焦点区域直径在150微米范围内，并保留了基础图谱的所有细节。在半最大ΔR处测量的重叠区域在15 - 25%范围内。相比之下，我们发现前爪和后爪表征之间有清晰的边界且无重叠。数据表明，大的且重叠的皮层图谱构成了一种正常类型的神经表征，支持了分布式神经处理方案的观点。
