Phase-locked oscillatory ∼15- to 30-hz response to transient visual contrast stimulation: neuromagnetic evidence for cortical origin in humans

阅读量：

作者：

L Narici a b，S Carozzo c，L Lopez d，C Ogliastro e，W.G Sannita c e

展开

摘要：

We present neuromagnetic evidence that the human oscillatory (-15–30 Hz; "gamma band") mass response to transient visual (contrast) stimulation originates from cortical areas also generating the conventional pattern-evoked response (VERs). The oscillatory response has shorter latency from stimulus and earlier temporal evolution than the VERs, with different orientation of the source currents. These results suggest the activation of (partly) distinct generating neuronal assemblies with contributions to the development of the VER response. A functional role in stimulus-related cortical synchronization during early visual processing is further suggested and appears consistent with the results of single-unit/multiunit animal research.

展开

关键词：

Visual evoked responses Oscillatory responses Gamma-band activity Visual cortex Contrast stimulation Synchronized activation Neuromagnetic method Humans