Polianskiĭ V B, Alymkulov D E, Evtikhin D V, Chernyshev B V
Zh Vyssh Nerv Deiat Im I P Pavlova. 2011 Sep-Oct;61(5):595-605.
Electrodes were implanted into cranium above the primary visual cortex of four rabbits (Orictolagus cuniculus). At the first stage, visual evoked potentials (VEPs) were recorded in response to substitution of threshold visual stimuli (0.28 and 0.31 cd/m2). Then the sound (2000 Hz, 84 dB, duration 40 ms) was added simultaneously to every visual stimulus. Single sounds (without visual stimuli) did not produce a VEP-response. It was found that the amplitude ofVEP component N1 (85-110 ms) in response to complex stimuli (visual and sound) increased 1.6 times as compared to "simple" visual stimulation. At the second stage, paired substitutions of 8 different visual stimuli (range 0.38-20.2 cd/m2) by each other were performed. Sensory spaces of intensity were reconstructed on the basis of factor analysis. Sensory spaces of complexes were reconstructed in a similar way for simultaneous visual and sound stimulation. Comparison of vectors representing the stimuli in the spaces showed that the addition of a sound led to a 1.4-fold expansion of the space occupied by smaller intensities (0.28; 1.02; 3.05; 6.35 cd/m2). Also, the addition of the sound led to an arrangement of intensities in an ascending order. At the same time, the sound 1.33-times narrowed the space of larger intensities (8.48; 13.7; 16.8; 20.2 cd/m2). It is suggested that the addition of a sound improves a distinction of smaller intensities and impairs a dis- tinction of larger intensities. Sensory spaces revealed by complex stimuli were two-dimensional. This fact can be a consequence of integration of sound and light in a unified complex at simultaneous stimulation.
将电极植入4只家兔（穴兔）初级视觉皮层上方的颅骨中。在第一阶段，记录对阈限视觉刺激（0.28和0.31坎德拉每平方米）替代的视觉诱发电位（VEP）。然后将声音（2000赫兹，84分贝，持续时间40毫秒）同时添加到每个视觉刺激中。单个声音（无视觉刺激）未产生VEP反应。结果发现，与“简单”视觉刺激相比，对复合刺激（视觉和声音）的VEP成分N1（85 - 110毫秒）的振幅增加了1.6倍。在第二阶段，对8种不同视觉刺激（范围为0.38 - 20.2坎德拉每平方米）进行相互配对替代。基于因子分析重建强度的感觉空间。以类似方式重建复合刺激的感觉空间用于同时的视觉和声音刺激。比较空间中代表刺激的向量表明，添加声音导致较小强度（0.28；1.02；3.05；6.35坎德拉每平方米）占据的空间扩大了1.4倍。此外，添加声音导致强度按升序排列。同时，声音使较大强度（8.48；13.7；16.8；20.2坎德拉每平方米）的空间缩小了1.33倍。有人认为，添加声音改善了对较小强度的辨别，而损害了对较大强度的辨别。复合刺激揭示的感觉空间是二维的。这一事实可能是同时刺激时声音和光在统一复合体中整合的结果。
