Related Experiment Video
Updated: Sep 28, 2026
A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
Published on: May 25, 2019
Spatiotemporal analysis of the neuromagnetic response to rhythmic auditory stimulation: rate dependence and transient
Frederick W Carver1, Armin Fuchs, K J Jantzen
1Center for Complex Systems and Brain Sciences, Florida Atlantic University, Boca Raton, FL 33431, USA. carver@walt.ccs.fau.edu
Objective:
Whole head magnetoencephalography was used to investigate the spatiotemporal dynamics of neuromagnetic brain activity associated with rhythmic auditory stimulation.
Methods:
In order to characterize the evolution of the auditory responses we applied a Karhunen-Loève decomposition and k-means cluster analysis to globally compare spatial patterns of brain activity at different latencies and stimulation rates. Tones were presented binaurally at 27 different stimulation rates within a perceptually and behaviorally relevant range from 0.6 to 8.1 Hz.
Results:
Over this range, we observed a linear increase of the amplitude of the main auditory response at 100 ms latency (N1m) with increasing inter-stimulus interval, and qualitative changes of the overall spatiotemporal dynamics of the auditory response. In particular, a transition occurred between a transient evoked response at low frequencies, and a continuous steady-state response at high frequencies.
Conclusions:
We show the onset of temporal overlap between responses to successive tones that leads to this transition. Response overlap begins to occur near 2 Hz, marking the onset of a continuous perceptual representation.
