Neural mechanisms underlying uninstructed orofacial movements during reward-based learning behaviors

Wan Ru Li, Takashi Nakano, Kohta Mizutani, Takanori Matsubara, Masahiro Kawatani, Yasutaka Mukai, Teruko Danjo, Hikaru Ito, Hidenori Aizawa, Akihiro Yamanaka, Carl C.H. Petersen, Junichiro Yoshimoto, Takayuki Yamashita

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

During reward-based learning tasks, animals make orofacial movements that globally influence brain activity at the timings of reward expectation and acquisition. These orofacial movements are not explicitly instructed and typically appear along with goal-directed behaviors. Here, we show that reinforcing optogenetic stimulation of dopamine neurons in the ventral tegmental area (oDAS) in mice is sufficient to induce orofacial movements in the whiskers and nose without accompanying goal-directed behaviors. Pavlovian conditioning with a sensory cue and oDAS elicited cue-locked and oDAS-aligned orofacial movements, which were distinguishable by a machine-learning model. Inhibition or knockout of dopamine D1 receptors in the nucleus accumbens inhibited oDAS-induced motion but spared cue-locked motion, suggesting differential regulation of these two types of orofacial motions. In contrast, inactivation of the whisker primary motor cortex (wM1) abolished both types of orofacial movements. We found specific neuronal populations in wM1 representing either oDAS-aligned or cue-locked whisker movements. Notably, optogenetic stimulation of wM1 neurons successfully replicated these two types of movements. Our results thus suggest that accumbal D1-receptor-dependent and -independent neuronal signals converge in the wM1 for facilitating distinct uninstructed orofacial movements during a reward-based learning task.

Original languageEnglish
Pages (from-to)3436-3451.e7
JournalCurrent Biology
Volume33
Issue number16
DOIs
Publication statusPublished - 21-08-2023

All Science Journal Classification (ASJC) codes

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences

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