ENDOGENOUS NEURAL NOISE AND REACTION TIME
Is the detection of weak visual stimuli facilitated by a particular level of endogenous neural noise? We measured the EEG while subjects responded to the occurrence of weak luminance increments. We used independent component (IC) analysis and dipole fitting to locate the neural sources of EEG responses to the stimuli and then determined the relationship between the variability of the frequency-specific oscillations of the relevant neural sources in the 1 sec before stimulus presentation and the RT on hit trials. An intermediate amount of power variability yielded the fastest RTs. The relationship was strongest for lower frequencies.