2014, Number 1
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Salud Mental 2014; 37 (1)
El origen y las funciones de los sueños a partir de los potenciales PGO
Ramírez-Salado I, Cruz-Aguilar MA
Language: Spanish
References: 87
Page: 49-58
PDF size: 363.09 Kb.
ABSTRACT
Understanding the phenomenon of sleep and dreams has fascinated
humans always. However, the scientific study of sleep is relatively
recent. In 1953, Aserinsky and Kleitman found that slow wave sleep
(SWS) was periodically interrupted by episodes of rapid EEG activity,
which are accompanied by rapid eye movements (REMs), and named
this sleep phase as REM sleep. Subsequently, in 1957, Dement and
Kleitman discovered that these rapid eye movements coincided with
the appearance of dreams. By using animal experimental models,
the subcortical mechanisms underlying REM sleep have been studied,
and it has been demonstrated that this activity depends on the serotonergic
activity from wakefulness, which promotes the formation of
peptides that trigger certain structures of the brainstem, where cholinergic
mechanisms of REM sleep are integrated. In turn, on the pontine
region monophasic phasic potentials (300-400 μV) are generated
that can also be recorded on the lateral geniculate body and in the
occipital cortex; hence the name of ponto-geniculo-occipital waves
(PGO). These potentials spread to the oculomotor system to provoke
the REMs of REM sleep and possibly give rise to visual hallucinatory
phenomena. Furthermore, it has been shown that certain limbic structures
related to emotion and memory are activated by these potentials.
This suggests that PGO waves generate mnemonic and emotional
components of dreams. Several aspects of the functions of these PGO
waves remains to be determined, but knowledge about the origin of
brain phenomena that generate dreams has had a breakthrough from
its study. In the present work we review the literature concerning the
work done over PGO waves and its contribution to the knowledge of
the origin and functions of dreams.
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