![]() ![]() ![]() A variety of neurochemical systems can influence dreaming, including the neuromodulators acetylcholine, dopamine, serotonin, and norepinephrine. REM sleep dreaming may activate anterior and midline portions of the brain's "default mode," a network of structures that supports self-related cognition when the brain is unoccupied by external stimuli. In REM compared to waking, there is relatively more activation of the brain's limbic system and relatively less activity of cortical areas involved in higher-level cognition. ![]() Differences between forebrain activation patterns in waking and REM sleep suggest bases for their phenomenological differences. As in waking consciousness, such experiences in both rapid eye movement (REM) and non-REM (NREM) sleep are associated with activation of forebrain structures by ascending arousal systems of the brainstem, hypothalamus, and basal forebrain. Dreaming is a universal human mental state characterized by hallucinatory imagery congruent with a confabulated, temporally ordered, storylike experience. ![]()
0 Comments
Leave a Reply. |