Shevelev I A, Tsicalov E N
Department of Sensory Physiology, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow.
Neuroscience. 1997 Jan;76(2):531-40. doi: 10.1016/s0306-4522(96)00206-0.
Fast thermal waves spreading over the cerebral cortex were found in the white rat by infrared neuroimaging (thermoencephaloscopy) in the range of 3-5 microm. Thermal waves appeared under visual stimulation (the probability of their appearance = 0.92), and under background conditions (probability of appearance = 0.42). Typically, they moved during the period from 15 s before to 25 s after each light flash that was presented rhythmically (1.5-3 per min). The waves spread over the cerebral cortex along the limited number of typical trajectories, which are specific for the hemisphere of their origin (ipsilateral or contralateral with the side of stimulation). The waves were never recorded in a dead animal or in a thermal standard. The amplitude of the thermal waves was in the range of 0.005-0.1 degrees C, with the extent of the pathway of 2-56 mm, length of 10-15 mm, duration of 1.2-11.4 s, and velocity of 1-33 mm/s. In about half of the cases the waves appeared in the contralateral visual cortex (areas 17 and 18a), spread to the midline and crossed to the ipsilateral hemisphere (areas 17, 18a and 7). Local waves moving along a circular trajectory and rotating around the central part of the contralateral area 17 were also revealed, as well as wave rotation around the dorsal (mainly parietal) cortical fields. Possible biophysical and neurophysiological mechanisms and the functional significance of the revealed effects are discussed.
通过红外神经成像（热脑镜检查）在3 - 5微米范围内，在白鼠大脑皮层中发现了快速热波。热波在视觉刺激下出现（出现概率 = 0.92），在背景条件下也会出现（出现概率 = 0.42）。通常，它们在每次有节奏呈现的闪光（每分钟1.5 - 3次）前15秒到后25秒期间移动。这些波沿着有限数量的典型轨迹在大脑皮层上传播，这些轨迹对于其起源的半球（同侧或与刺激侧对侧）是特定的。在死动物或热标准体中从未记录到这些波。热波的振幅在0.005 - 0.1摄氏度范围内，传播路径长度为2 - 56毫米，长度为10 - 15毫米，持续时间为1.2 - 11.4秒，速度为1 - 33毫米/秒。在大约一半的情况下，波出现在对侧视觉皮层（17区和18a区），扩散到中线并交叉到同侧半球（17区、18a区和7区）。还发现了沿着圆形轨迹移动并围绕对侧17区中心部分旋转的局部波，以及围绕背侧（主要是顶叶）皮层区域的波旋转。文中讨论了所揭示效应的可能生物物理和神经生理机制以及功能意义。
