Effect of Prestimulus Alpha Power, Phase, and Synchronization on Stimulus Detection Rates in a Biophysical Attractor Network Model

• DOI: 10.1523/jneurosci.5155-12.2013
• Publication Date: 2013-07-17T16:34:14Z
• Authors: M. Lundqvist; P. Herman; A. Lansner
• Keywords: Stimulus (psychology); Alpha (finance); Local field potential; Phase synchronization; Phase locking

Spontaneous oscillations measured by local field potentials, electroencephalograms and magnetoencephalograms exhibit a pronounced peak in the alpha band (8–12 Hz) humans primates. Both instantaneous power phase of these ongoing have commonly been observed to correlate with psychophysical performance stimulus detection tasks. We use novel model-based approach study effect prestimulus on rate. A previously developed biophysically detailed attractor network exhibits spontaneous range before is presented transiently switches gamma-like successful detection. demonstrate that both modulate probability such state transitions. The can either positively or negatively rate, agreement experimental findings, depending underlying neural mechanism modulating oscillatory power. Furthermore, spatially distributed oscillators be synchronized global nonspecific weak excitatory signals. These synchronization events lead transient increases alpha-band render sensitive exact timing target stimuli, making cycle function as temporal mask line recent observations. Our results are relevant several studies attribute modulatory role dynamics.