Pontogeniculooccipital waves: spontaneous visual system activity during rapid eye movement sleep.
Level 5 - mechanism / opinion, no new human data
Narrative review of animal neurophysiology and pharmacology (CEBM Level 5).
PubMed 3308096 · doi:10.1007/BF00711551
What was done
This narrative review summarizes electrophysiological and pharmacological findings across various species regarding the site of origin, propagation pathways, neurochemical regulation, and potential functions of pontogeniculooccipital (PGO) waves during rapid eye movement (REM) sleep.
What was found
The abstract reports no numerical data. Qualitatively, it reports that PGO waves originate spontaneously in the pontine brainstem (accompanied by increased firing near the brachium conjunctivum and cessation of firing in dorsal raphe neurons) and are recorded in the lateral geniculate bodies and occipital cortex. PGO activity is influenced by auditory and somatosensory inputs. Antagonism of noradrenergic or serotonergic neurotransmission increases PGO wave occurrence independently of REM sleep, whereas cholinomimetics increase both PGO wave occurrence and other components of REM sleep.
Why it matters
PGO waves are a key electrophysiological marker connecting brainstem generation circuits to sensory forebrain regions during REM sleep. Understanding their regulation helps elucidate the neural substrates of internal visual activation and state-dependent brain excitability.
Limits
The abstract provides no sample sizes, specific species counts, or quantitative metrics. As a narrative review summarizing predominantly mechanistic animal experiments, the functional hypotheses remain speculative, and findings cannot be directly confirmed in humans from the provided text.
Cited by
- supports During sleep, neural activity is periodically sent from the midbrain specifically to the visual cortex approximately every 90 minutes.