Funktionale Kernspintomografie eines gesunden schlafenden Probanden: Während des tonischen REM-Schlafes, gekennzeichnet durch das kurzzeitige Ausbleiben der raschen Augenbewegungen, führen akustische Reize zu einer geringen Aktivierung des entsprechenden sensorischen Areals im Gehirn, dem auditiven Kortex (linkes Bild). Im Gegensatz dazu ist in phasischen REM-Perioden, mit Augenbewegungen, das Gehirn durch Außenreize weitgehend nicht stimulierbar, sondern zeigt eine eigenständig generierte Aktivität in weitreichenden Gehirnregionen - ein Indiz für den Traumprozess (rechtes Bild).
MPI für Psychiatrie
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