Bermudez Maria A, Vicente Ana F, Romero Maria C, Perez Rogelio, Gonzalez Francisco
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain.
Vis Neurosci. 2009 Jul-Aug;26(4):421-8. doi: 10.1017/S0952523809990198.
We studied the correlation between the spatial frequency of complex stimuli and neuronal activity in the monkey inferotemporal (IT) cortex while performing a task that required visual recognition. Single-cell activity was recorded from the right IT cortex. The frequency components of the images used as stimuli were analyzed by using a fast Fourier transform, and a modulus was obtained for 40 spatial frequency ranges from 0.3 to 11.1 cycles/deg. We recorded 82 cells showing statistically significant responses (analysis of variance, P < 0.05) to at least one of the images used as a stimulus. Seventy-eight percent of these cells (n = 64) showed significant responses to at least three images, and in two thirds of them (n = 42), we found a statistically significant correlation (P < 0.05) between cell response and the modulus amplitude of at least one frequency range present in the images. Our results suggest that information about spatial frequency of the visual images is present in the IT cortex.
我们在猴子颞下（IT）皮质执行视觉识别任务时，研究了复杂刺激的空间频率与神经元活动之间的相关性。从右侧IT皮质记录单细胞活动。通过快速傅里叶变换分析用作刺激的图像的频率成分，并获得了40个空间频率范围（从0.3到11.1周/度）的模量。我们记录了82个对至少一种用作刺激的图像表现出统计学显著反应（方差分析，P < 0.05）的细胞。这些细胞中有78%（n = 64）对至少三张图像表现出显著反应，其中三分之二（n = 42）的细胞，我们发现细胞反应与图像中至少一个频率范围的模量幅度之间存在统计学显著相关性（P < 0.05）。我们的结果表明，视觉图像的空间频率信息存在于IT皮质中。
