System 03 · sensory & autonomic physiology
PGO-like activity & autonomic variability
PGO-like phasic activity is well characterized in animals and has limited direct human intracranial evidence. Its precise contribution to human dream imagery remains uncertain, while autonomic variability is a broader measurable feature of REM sleep.
What PGO evidence actually shows
Ponto-geniculo-occipital waves are well characterized in animals. PGO-like phasic potentials have also been recorded directly in the human pons, but the direct human evidence is limited and should not be generalized into a complete model of dream imagery.
Visual imagery: plausible contribution, not a scene generator
PGO activity has long been proposed as one contributor to internally generated visual experience during REM. That remains biologically plausible, but human dream reports do not let us map one PGO event to one remembered image or scene.
Autonomic variability in REM
Heart rate, breathing, and thermoregulatory control can vary across REM sleep, particularly around phasic activity. A racing-heart sensation, irregular breathing, heat, or chill on waking can be recorded as context, but those sensations do not identify a PGO event or prove that the preceding sleep stage was REM.
What Oneirox should infer
Keep the inference at the level supported by observation. Autonomic sensations can describe the waking transition. They cannot establish a specific transmitter surge, a PGO “load,” or the neural cause of a particular dream plot.
Human PGO evidence: Lim et al., Sleep (2007), PMID 17682651.
Practical capture rule
Record what was actually observed: breathing sensation, pulse sensation, temperature change, eye movement or flutter if externally observed, timing, and awakening context. Keep the mechanism separate from the observation.
Record autonomic context
Record pulse sensation, breathing, sweating, temperature changes, and timing as observations. Subjective residue does not identify a PGO event or reconstruct the exact sleep stage.
Open Lab SearchEducational neurobiology. Not medical advice.