28 weeks: Synchronous waves during REM sleep cause permanent connections to form for sensory systems. “The neurons of the retina, cochlea, spinal cord, and olfactory and limbic systems mature to a level where they fire in synchronous waves beginning around 28 weeks gestation when cycles begin. The synchronous waves only occur during rapid eye movement (REM) sleep. These synchronous waves of stimulus cause the synapses of the sensory system to form permanent connections and circuits that are the basic architecture of the sensory nuclei and neocortex.”

28 weeks: Synchronous waves during REM sleep cause permanent connections to form for sensory systems.
 
“The neurons of the retina, cochlea, spinal cord, and olfactory and limbic systems mature to a level where they fire in synchronous waves beginning around 28 weeks gestation when cycles begin. The synchronous waves only occur during rapid eye movement (REM) sleep. These synchronous waves of stimulus cause the synapses of the sensory system to form permanent connections and circuits that are the basic architecture of the sensory nuclei and neocortex.”

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