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Leslie M. Kay

University of Chicago
Dynamic relationships between hippocampal and olfactory theta and gamma oscillations
Many analyses of system dynamics rely on long periods of relatively stationary activity as measured by neural signals. Dynamical models of perceptual systems should take into account the extreme nonstationarity of behavior and not rely on stationary states, which usually represent habituation, attentive waiting or even seizures. Psychological or behavioral states can be fleeting, lasting on the order of one second or less. Olfactory-guided behavior displays rapid successions of behavioral states, often changing from one sniff to the next. The neural correlates of these changes are represented in the wide-ranging changes in the frequency and coherence characteristics of the local field potential as well as the firing properties of individual neurons in the olfactory bulb. They may be induced by changes in motor behavior, neuromodulatory release, momentary centrifugal control of peripheral sensory brain regions or all of these.
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