The Neuroscience of Speech, Language & Music | Dr. Erich Jarvis

Andrew Huberman interviews Dr. Erich Jarvis about the neuroscience of speech, language, music, and movement. Jarvis argues there is no separate 'language module' in the brain; instead, speech-production and auditory-perception pathways carry the algorithms of language, and these circuits evolved out of motor circuits for body movement. He explains striking convergence between humans and vocal-learning birds down to genes and mutations, why only vocal learners can dance, and how singing, gesture, and facial expression connect to speech. The conversation also covers critical periods, bilingualism, stutter, reading and writing as multi-circuit acts, texting's effect on language, brain-to-text interfaces, and his large-scale genome-sequencing and species-conservation work.

• Jarvis argues there is no separate 'language module' in the brain; the speech-production and auditory pathways themselves carry language's algorithms.
  00:09:25
• Speech pathways evolved out of brain pathways that control body movement, which is why we gesture with our hands even on the phone.
  00:13:39
• Genetic data from Neanderthal and Denisovan fossils suggests they had spoken language, possibly dating it back 500,000 to a million years.
  00:20:33
• FOXP2 and similar mutations causing human speech deficits produce similar deficits when introduced into vocal-learning birds, showing deep convergence.
  00:25:18
• Only vocal-learning species can learn to dance; their dance circuits are embedded in the same circuits that enable learned vocalization.
  00:51:50
• Reading silently activates your speech motor pathway and laryngeal muscles, so you literally 'speak' what you read inside your head.
  01:13:15
• Brain-to-text work (Eddie Chang) plus the no-language-module view implies thoughts could eventually be read and even transmitted wirelessly.
  01:34:24
• The first error-free, complete human Telomere-to-Telomere genome revealed 'dark matter' regulatory regions specialized in vocal-learning species.
  01:44:51

• Dogs can understand several hundred human words and great apes thousands, but neither can speak a single word.
  00:10:30
• Hummingbirds hum with their wings and sing with their syrinx, and some snap their wings in unison with their song.
  00:25:49
• Some speech-circuit genes work by being turned OFF, removing repulsive molecules so new neural connections can form.
  00:33:36
• The larynx contains the fastest-firing muscles in the body, requiring special calcium-buffering and heat-shock proteins to avoid neuron toxicity.
  00:34:06
• Spoken language likely evolved first for singing and emotional mate-attraction before being repurposed for abstract communication.
  00:47:11
• Humans stay more neurally immature for life via an extra copy of the gene srGAP2, keeping our brains more juvenile and plastic.
  00:38:17
• Writing engages at least four brain circuits at once: visual, speech-production, auditory, and hand motor.
  01:14:19
• Jarvis discovered stuttering in songbirds tied to basal ganglia damage; birds recover via neurogenesis in ways humans cannot.
  01:22:22
• Dark and light human skin color each evolved independently multiple times, repeatedly hitting the same melanin genes.
  01:48:35
• Jarvis sequences genomes for conservation groups like Revive & Restore and Colossal to help resurrect the passenger pigeon and woolly mammoth.
  01:47:30