title: Error Signals in Motor Cortices Drive Adaptation in Reaching.
abstract: Reaching movements are subject to adaptation in response to errors induced by prisms or external perturbations. Motor cortical circuits have been hypothesized to provide execution errors that drive adaptation, but human imaging studies to date have reported that execution errors are encoded in parietal association areas. Thus, little evidence has been uncovered that supports the motor hypothesis. Here, we show that both primary motor and premotor cortices encode information on end-point errors in reaching. We further show that post-movement microstimulation to these regions caused trial-by-trial increases in errors, which subsided exponentially when the stimulation was terminated. The results indicate for the first time that motor cortical circuits provide error signals that drive trial-by-trial adaptation in reaching movements.
authors.affiliation: Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology, and Osaka University, Yamadaoka 1-4, Suita, Osaka, 565-0871, Japan; Department of Neurophysiology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo, Tokyo 113-8421, Japan. Electronic address: msinoue@nict.go.jp.
authors.forename: Masato
authors.initials: M
authors.lastname: Inoue
authors.affiliation: Dynamic Brain Network Laboratory, Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan.
authors.forename: Motoaki
authors.initials: M
authors.lastname: Uchimura
authors.affiliation: Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology, and Osaka University, Yamadaoka 1-4, Suita, Osaka, 565-0871, Japan; Department of Neurophysiology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo, Tokyo 113-8421, Japan; Dynamic Brain Network Laboratory, Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan; Department of Brain Physiology, Graduate School of Medicine, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan. Electronic address: kitazawa@fbs.osaka-u.ac.jp.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kitazawa
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D000818:Animals; D004558:Electric Stimulation; D004576:Electromyography; D005133:Eye Movements / Q000502:physiology; D008251:Macaca; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*