Quote · Huberman Lab
Essentials: The Science & Treatment of Bipolar Disorder
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Exteroception vs. Interoception, Neural Circuit Atrophy
At 17:52 · chapter starts 16:50
Huberman introduces the distinction between exteroception (attention to the external world) and interoception (awareness of internal body states), explaining that we normally exist in a dynamic balance between the two. In bipolar disorder, this balance is disrupted in a particularly insidious way: interoceptive circuits atrophy progressively over years, meaning the patient gradually loses the ability to notice that they haven't slept in 5 days, are talking too fast, or haven't eaten. This emerging understanding — that bipolar disorder is partly a disorder of self-perception — reframes why manic patients so often feel fine during episodes that are objectively destructive. The hyperactivity that defines early-stage bipolar disorder is likely the driver of this atrophy, via excitotoxicity. And lithium, by protecting against excitotoxicity, likely slows or prevents the erosion of these crucial self-monitoring circuits.
People with bipolar disorder show progressively diminished interoceptive capacity over the second and third decades of the illness, impairing self-awareness of manic states.
