Magnetoencephalographic Evidence for Induced Rhythms
Induced rhythmic oscillations of neuronal activity in the brain is a fascinating subject that holds promise of being of importance in understanding pattern formation in the central neurons system (CNS). Since the pioneering work by Adrian and Matthews (1928) there have been a number of publications in this field (see chapter by Bullock, this volume). Such induced (i.e., stimulus- or event- induced) as opposed to driven rhythmic oscillations have been recently shown by means of electrode experiments in animals (Eckhorn et al., 1988; Freeman and van Dijk, 1987; Gray and Singer, 1987; Gray et al., 1989; see Gray et al. and Eckhorn et al., this volume) and the experimental recordings include single unit spike trains, local field potentials (LFP), and multiple unit activities. Of interest in this connection is the discovery by Llinas and coworkers (Llinas, 1989; Steriade and Llinas, 1988) of “autorhythmic” neurons capable of acting as oscillators with multiple eigenfrequencies (e.g., 6 and 10 Hz) or as resonators that may be excited in a resonant way. Also in this case the experimental results are based on electrode experiments essentially of single unit character.
KeywordsContour Plot Local Field Potential Tone Burst Equivalent Current Dipole Spontaneous Oscillation
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