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Spontaneous phasic activity in the brain: differences between waves in lateral geniculate and central lateral nuclei across sleep states
Authors:Sanford   Morrison   Ball   Ross   Mann
Affiliation:Laboratories of Anatomy, The School of Veterinary Medicine, The University of Pennsylvania, USA;Department of Psychiatry, The School of Medicine, The University of Pennsylvania, USA;Institute of Neurological Sciences, The University of Pennsylvania, USA
Abstract:
SUMMARY  Ponto-geniculo-occipital (PGO) waves are spontaneously-occurring macropotential waveforms recorded in the pons, lateral geniculate body (LGB) and occipital cortex. PGO waves mark the onset and course of rapid eye movement sleep (REM). PGO-like waves can be recorded in several brain areas including the thalamic central lateral nucleus (CL). Alerting stimuli elicit PGO waves (PGOE) from LGB and waves from CL (CLE) in all behavioural states. We compared spontaneous activity in LGB and CL across behavioral states to examine the relationship of CL waves to PGO waves. Spontaneous waves in LGB and CL may occur concurrently or separately in all states. Although REM is marked by a high level of LGB PGO activity, CL waves are rare. Frequencies of CL and LGB waves are similar in non-REM (NREM) although the waves do not necessarily occur at the same time. These findings suggest that the widespread phasic activity recorded throughout the brain in sleep cannot be assumed to be a non-specific unitary phenomenon propagated from a single brainstem generator.
Keywords:keywords central lateral thalamic nucleus    lateral geniculate body    PGO waves sleep
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