Orgs Guido, Dovern Anna, Hagura Nobuhiro, Haggard Patrick, Fink Gereon R, Weiss Peter H
Department of Psychology, Goldsmiths, University of London, SE14 6NW, London, UK Institute of Cognitive Neuroscience, University College London, WC1N 3AR, London, UK.
Cognitive Neuroscience Section, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, 52428 Juelich, Germany Department of Neurology, University Hospital Cologne, 50937 Cologne, Germany.
Cereb Cortex. 2016 Jan;26(1):440-9. doi: 10.1093/cercor/bhv262. Epub 2015 Nov 2.
The human brain readily perceives fluent movement from static input. Using functional magnetic resonance imaging, we investigated brain mechanisms that mediate fluent apparent biological motion (ABM) perception from sequences of body postures. We presented body and nonbody stimuli varying in objective sequence duration and fluency of apparent movement. Three body postures were ordered to produce a fluent (ABC) or a nonfluent (ACB) apparent movement. This enabled us to identify brain areas involved in the perceptual reconstruction of body movement from identical lower-level static input. Participants judged the duration of a rectangle containing body/nonbody sequences, as an implicit measure of movement fluency. For body stimuli, fluent apparent motion sequences produced subjectively longer durations than nonfluent sequences of the same objective duration. This difference was reduced for nonbody stimuli. This body-specific bias in duration perception was associated with increased blood oxygen level-dependent responses in the primary (M1) and supplementary motor areas. Moreover, fluent ABM was associated with increased functional connectivity between M1/SMA and right fusiform body area. We show that perceptual reconstruction of fluent movement from static body postures does not merely enlist areas traditionally associated with visual body processing, but involves cooperative recruitment of motor areas, consistent with a "motor way of seeing".
人类大脑能够轻易地从静态输入中感知流畅的运动。我们使用功能磁共振成像技术，研究了介导从身体姿势序列中感知流畅的表观生物运动（ABM）的大脑机制。我们呈现了在客观序列持续时间和表观运动流畅性方面有所不同的身体和非身体刺激。将三种身体姿势进行排序，以产生流畅的（ABC）或不流畅的（ACB）表观运动。这使我们能够识别出在从相同的低层次静态输入中对身体运动进行感知重建时所涉及的脑区。参与者判断包含身体/非身体序列的矩形的持续时间，以此作为运动流畅性的一种隐性测量指标。对于身体刺激，流畅的表观运动序列比相同客观持续时间的不流畅序列产生的主观持续时间更长。对于非身体刺激，这种差异有所减小。这种持续时间感知中的身体特异性偏差与初级运动区（M1）和辅助运动区中血氧水平依赖反应的增加有关。此外，流畅的ABM与M1/ SMA和右侧梭状身体区之间功能连接性的增加有关。我们表明，从静态身体姿势中对流畅运动进行感知重建不仅涉及传统上与视觉身体处理相关的区域，还涉及运动区的协同招募，这与“运动的视觉方式”一致。
