Gamma-Band Correlations in Primary Visual Cortex

Abstract

Neural field theory is used to quantitatively analyze the two-dimensional spatiotemporal correlation properties of gamma-band (30 - 70 Hz) oscillations evoked by stimuli arriving at the primary visual cortex (V1), and modulated by patchy connectivities that depend on orientation preference (OP). Correlation functions are derived analytically under different stimulus and measurement conditions. The predictions reproduce a range of published experimental results, including the existence of two-point oscillatory temporal cross-correlations with zero time-lag between neurons with similar OP, the influence of spatial separation of neurons on the strength of the correlations, and the effects of differing stimulus orientations.\n\nGraphical Abstract\n\nO_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=87 SRC=\"FIGDIR/small/339184_ufig1.gif\" ALT=\"Figure 1\">\nView larger version (44K):\norg.highwire.dtl.DTLVardef@12be853org.highwire.dtl.DTLVardef@1a1b228org.highwire.dtl.DTLVardef@b785dcorg.highwire.dtl.DTLVardef@b53a2a_HPS_FORMAT_FIGEXP M_FIG C_FIG HighlightsO_LIIncorporate orientation preference map into patchy connectivities of neurons in V1.\nC_LIO_LIGeneralize spatiotemporal correlation function of neural activity to 2D spatially.\nC_LIO_LIReproduce experimental results: synchronization of neural activities in gamma band.\nC_LIO_LITemporal correlation between 2 measurements decreases with increasing separation.\nC_LIO_LIPredict 2D spatial map of temporal correlation strength between 2 measurement sites.\nC_LI