title: Evoked oscillatory cortical responses are dynamically coupled to peripheral stimuli.
abstract: We report that the response of neurons in rat somatosensory cortex to tactile stimulation consists of two components, a short-latency response and an oscillatory response, observable as up to 8 peaks in the post-stimulus-time-histogram with interpeak intervals in the order of 100 ms (10 Hz). While the first component is always stimulus locked, the second component is strictly stimulus-locked only when elicited from the resting state: once started, the oscillations are only weakly affected by further stimulation. This implies generally that the question of stimulus locking of oscillatory response components is not a yes/no question. Instead, the concept of dynamic coupling is shown to adequately capture the different limit cases. We present a simple dynamic model that exemplifies this point.
authors.affiliation: Institut für Neuroinformatik, Ruhr-Universität Bochum, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Schöner
authors.forename: K
authors.initials: K
authors.lastname: Kopecz
authors.forename: F
authors.initials: F
authors.lastname: Spengler
authors.forename: H R
authors.initials: HR
authors.lastname: Dinse
mesh_terms: D000818:Animals; D005071:Evoked Potentials; D008564:Membrane Potentials; D009474:Neurons / Q000502:physiology*; D009991:Oscillometry; D010812:Physical Stimulation; D051381:Rats; D013003:Somatosensory Cortex / Q000502:physiology*; D013997:Time Factors; D014110:Touch