1. Example of coherence modulation by the perturbation of spatial structure in the stimuli.
Example of coherence modulation by the perturbation of spatial structure in the stimuli. The black traces in the plots represent the coherence between cells, whereas the gray dotted curves above and below represent the 95% confidence intervals of the coherence derived from the jack-knifing method. The straight gray dotted line draws the theoretical 95% confidence limit for the coherence estimated via multivariate statistics. A, With regular drifting sine-wave gratings, the coherence spectrum exhibited prominent elevation at ∼10 and 50 Hz, respectively. B–E, The coherence between cells, especially in the gamma band, decreases with the percentage increase of the spatial noise level in the image. F, With 100% drifting spatial noise, the spatial structure of stimulus is destroyed, whereas the temporal coherence was maintained. Only a small amount of coherence was preserved in the low-frequency band (<10 Hz), whereas gamma coherence disappeared completely.
Zhiyi Zhou et al. J. Neurosci. 2008;28:
©2008 by Society for Neuroscience