Neuroscience 2000 Abstract
| Presentation Number: | 67.16 |
|---|---|
| Abstract Title: | Functional MRI of explicit and implicit learning of a visuo-motor rotation task. |
| Authors: |
Miall, R. C.*1,2
; Ecker, C.3
1Physiology, University of Oxford, Oxford, United Kingdom 2FMRIB Centre, University of Oxford, Oxford, United Kingdom 3Psychology, University of Oxford, Oxford, United Kingdom |
| Primary Theme and Topics |
G. Motor Systems and Sensorimotor Integration - 96. Sensorimotor integration |
| Secondary Theme and Topics | I. Neural Basis of Behavior<br />- 102. Cognition: human learning and memory |
| Session: |
67. Sensorimotor integration: human visuomotor Poster |
| Presentation Time: | Sunday, November 5, 2000 11:00 AM-12:00 PM |
| Location: | Hall G-J |
| Keywords: | VISUOMOTOR ADAPTATION, POSTERIOR PARIETAL, CEREBELLUM, PREFRONTAL CORTEX |
Explicit and implicit sequence learning has been extensively studied, but explicit and implicit learning of visuo-motor transformations is less well understood. Gradual, implicit, rotation of visual feedback in a tracking task leads to greater learning than a sudden, explicit, rotation and may involve different neural circuits. We studied this task with whole brain fMRI at 3T. 5 right handed subjects (4 female, 1 male) followed alternating motion of a visual target with a cursor controlled by a joystick. In experiment 1, we used 5 conditions in a 30s block design: rest (eye movement only), normal tracking, adaptation to step (30° in 1 trial) or ramp rotation (1° per trial ramping to 30°) and re-adaptation to normal tracking. Comparison of adaptation vs. normal movement highlighted the main motor areas but also bilateral posterior parietal cortex BA39. Contrasting step and ramp adaptation showed activation of extrastiate visual areas and BA39. In experiment 2, we tested cued and uncued ramp rotation, with screen colour as an explicit cue, again with rest, normal and re-adaptation blocks. Strong activation of right prefrontal cortex, BA 10, was seen in contrast of explicit and implicit ramp adaptation with extrastriate visual and superior parietal activation, and lateral cerebellum contralateral to the hand used. These results suggest that the right prefrontal cortex signals cued knowledge of the experimental condition, whereas posterior parietal cortex is selectively concerned with adaptation to the explicit visuo-motor change during step rotation. Activation of contralateral cerebellum was seen in both tasks during adaptation to explicit change.
Supported by Wellcome Trust (RCM) & MRC (FMRIB Centre)
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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