運動イメージは大別して,一人称イメージと三人称イメージがある.今回,我々は一人称イメージと「横から突き出た足」と「前から突き出た足」の二パターンの三人称イメージを用いて足趾を動かそうとイメージする課題を行い,fMRI にて脳画像を比較した.【方法】対象は,健常者20 名(年齢20 - 28 歳).課題は,スクリーンに映し出された一人称イメージと二パターンの三人称イメージの映像に合わせて右足趾を動かそうとイメージする運動とした.一連の動作をf - MRI にて解析し比較した.【結果】映像を見ながら足趾の運動をイメージする場合,三人称イメージを見ながら運動した場合,二パターン共に著名な変化はなかった.一人称イメージを見ながら運動を行うほうが右の側頭極の活動が増加した.【考察】三人称イメージは方向に関わらず活動増加しなかった.側頭極は「心の理論」と関係する.他者の一人称イメージ映像での運動課題の方が他者の意図を理解する脳活動を増加させる可能性がある.There are two main modes of motor imagery: a first-person perspective imagery (1PPI: inestheticmotor imagery) and a third-person perspective imagery (3PPI: Visual motor imagery). 1PPI involves imagining the feeling of performing a certain movement. 3PPI involves imagining seeing yourself performing a certain movement. But 3PPI involves two patterns; they are a horizontal pattern and a front pattern. The purpose of this study is to determine the cortical representations in 1PPI and two patterns’ 3PPI during toes’ movements in healthy persons using f-MRI.Methods:We enrolled 20 healthy subjects with right-handed leg, and they signed consent forms. f-MRI of 1.5T was used to map cortical representations associated with motor tasks of the right toes. In these tasks, subjects watched video-clip depicting simple 1PPI and two patterns’ 3PPI actions of toes. And they were required to image the models.Results:We compared 1PPI tasks with two patterns’ 3PPI tasks at f-MRI maps. During imaging toes’ movements, subjects in 1PPI tasks showed an increased representation of activation in the right temporal pole. However in two patterns’ 3PPI tasks increased activation was not found there.Conclusions:In a recent study, the temporal pole was active with regards to Theory of Mind. Our results suggest that the brain activity which understands an intention of the others may increase by 1PPI tasks