Awake but non-attentive animals have large-amplitude synchronized 25-Hz to 35-Hz oscillations {gamma wave} [Engel and Singer, 2001] [Keil et al., 1999] [Klemm et al., 2000] [Revonsuo et al., 1997] [Rodriguez et al., 1999] [Tallon-Baudry and Bertrand, 1999].
locations
Visual precentral and postcentral cortex, retina, olfactory bulb, thalamus, other brain nuclei, and cerebral neocortex have continuous and coherent 30-Hz to 70-Hz {40-Hz oscillation} electric potential oscillations.
All visual areas and both hemispheres synchronize cells. Visual field feature produces coherent 40-Hz oscillations separated by as much as 7 mm in visual cortex [Eckhorn et al., 1988] [Eckhorn et al., 1993] [Engel et al., 1990] [Friedman-Hill et al., 2000] [Gray and Singer, 1989] [Kreiter and Singer, 1992] [Ritz and Sejnowski, 1997].
Somatosensory and motor cortex potentials synchronize while thinking but vanish during actual movement.
cause
40-Hz oscillations happen when cells in different cortex or thalamus parts respond to linked stimulus parts [Crick and Koch, 1990] [Engel and Singer, 2001] [Metzinger, 2000].
attention
Oscillations synchronize more during focused attention [Mountcastle et al., 1981] [Wurtz et al., 1982].
induced gamma wave
When people perceive object with coherent features, 30-Hz EEG wave starts in occipital cortex 200 ms after stimulus and dies out after perceptual processing.
Biological Sciences>Zoology>Organ>Nerve>Brain>Electrical Activity
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Date Modified: 2022.0224