|
コダマ タカシ
Kodama Takashi
児玉 貴史 所属 医学部 医学科 職種 講師 |
|
| 論文種別 | 原著 |
| 言語種別 | 英語 |
| 査読の有無 | 査読あり |
| 表題 | Adaptive Acceleration of Visually Evoked Smooth Eye Movements in Mice. |
| 掲載誌名 | 正式名：The Journal of neuroscience : the official journal of the Society for Neuroscience 略 称：J Neurosci ISSNコード：15292401/02706474 |
| 掲載区分 | 国外 |
| 巻・号・頁 | 36(25),pp.6836-49 |
| 著者・共著者 | Kodama Takashi, du Lac Sascha |
| 担当区分 | 筆頭著者,責任著者 |
| 発行年月 | 2016/06 |
| 概要 | UNLABELLED:The optokinetic response (OKR) consists of smooth eye movements following global motion of the visual surround, which suppress image slip on the retina for visual acuity. The effective performance of the OKR is limited to rather slow and low-frequency visual stimuli, although it can be adaptably improved by cerebellum-dependent mechanisms. To better understand circuit mechanisms constraining OKR performance, we monitored how distinct kinematic features of the OKR change over the course of OKR adaptation, and found that eye acceleration at stimulus onset primarily limited OKR performance but could be dramatically potentiated by visual experience. Eye acceleration in the temporal-to-nasal direction depended more on the ipsilateral floccular complex of the cerebellum than did that in the nasal-to-temporal direction. Gaze-holding following the OKR was also modified in parallel with eye-acceleration potentiation. Optogenetic manipulation revealed that synchronous excitation and inhibition of floccular complex Purkinje cells could effectively accelerate eye movements in the nasotemporal and temporonasal directions, respectively. These results collectively delineate multiple motor pathways subserving distinct aspects of the OKR in mice and constrain hypotheses regarding cellular mechanisms of the cerebellum-dependent tuning of movement acceleration.SIGNIFICANCE STATEMENT:Although visually evoked smooth eye movements, known as the optokinetic response (OKR), have been studied in various species for decades, circuit mechanisms of oculomotor control and adaptation remain elusive. In the present study, we assessed kinematics of the mouse OKR through the course of adaptation training. Our analyses revealed that eye acceleration at visual-stimulus onset primarily limited working velocity and frequency range of the OKR, yet could be dramatically potentiated during OKR adaptation. Potentiation of eye acceleration exhibited different properties between the nasotemporal a |
| DOI | 10.1523/JNEUROSCI.0067-16.2016 |
| PMID | 27335412 |