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Animal studies have partly validated these claims. For instance, one study conducted with rats showed that REM sleep deprivation after learning a new task disrupted their ability to perform the task again later. This was especially true if the task was complex (i.e., involved using unusual information or developing novel adaptive behaviours). [38]
Sleep deprivation studies have shown that deprivation early in life can result in behavioral problems, permanent sleep disruption, and decreased brain mass. [ 78 ] [ 57 ] The strongest evidence for the ontogenetic hypothesis comes from experiments on REM deprivation, and from the development of the visual system in the lateral geniculate ...
REM rebound is the lengthening and increasing frequency and depth of rapid eye movement (REM) sleep which occurs after periods of sleep deprivation. When people have been prevented from experiencing REM, they take less time than usual to attain the REM state. [ 1 ]
Sleep deprivation studies show that sleep is particularly important to normal brain function. Sleep is needed to remove reactive oxygen species caused by oxidative stress (and generally autophagy) and to repair DNA. REM sleep also decrease concentration of noradrenaline, which when in excess amount causes the cell to undergo apoptosis.
This study gives evidence that REM sleep is a significant factor in consolidating motor skill procedural memories, therefore sleep deprivation can impair performance on a motor learning task. This memory decrement results specifically from the loss of stage 2, REM sleep. [11]
Young woman asleep over study materials. The relationship between sleep and memory has been studied since at least the early 19th century.Memory, the cognitive process of storing and retrieving past experiences, learning and recognition, [1] is a product of brain plasticity, the structural changes within synapses that create associations between stimuli.
A study by Blagrove in 2013 looks into largely-anecdotal claims that "dreams can be a source of personal insight", and finds tangential support for the "facilitative effect of sleep on cognitive insight" and of REM sleep on emotional memory consolidation, and for the emergence of insight from the metaphorical representations of waking life ...
After going through stages of REM-sleep, people with depression report feeling better, in a study done by Cartwright et al. [40] Conversely, a theory proposed by Revonsuo [41] states that when people experience negative emotions or negative events, when they sleep the REM-sleep replays such events, which is known as rehearsal. [39]