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A Motor Cortical Contribution to the Anticipatory Postural Adjustments That Precede Reaching in Running Title: Motor Cortical Control of Posture
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yakovenko, Sergiy Drew, Trevor |
| Copyright Year | 2009 |
| Abstract | 240 words 28 Text Pages: 51 29 Total figures: 13 (including 2 Appendix figures) 30 Black and white figures: 8 31 Color figures: 5 32 Tables: 2 33 34 Articles in PresS. J Neurophysiol (May 20, 2009). doi:10.1152/jn.00042.2009 Copyright © 2009 by the American Physiological Society. Yakovenko & Drew Motor cortical control of posture May 14, 2009 Page 2 Abstract 35 36 We tested the hypothesis that pyramidal tract neurons (PTNs) in the motor cortex 37 contribute to the anticipatory postural adjustments (APAs) that precede the onset of a reach in 38 the standing cat. We recorded the discharge activity of 151 PTNs in area 4 of the pericruciate 39 cortex during reaches of both the contralateral and the ipsilateral limb in an instructed delay task. 40 A total of 70/151 PTNs were identified as showing an initial short-latency period of discharge 41 following the Go-signal. Linear regression analysis showed that in many of these PTNs the 42 short-latency discharge was time-locked to the Go signal and temporally dissociated from the 43 subsequent voluntary movement of the limb. The onset of the change in activity of most of those 44 Go-related neurons that we could test (62/70) was temporally related to the onset of the change 45 in the centre of vertical pressure. In 33/70 PTNs, Go-related activity was observed only during 46 contralateral reach, in 13/70 only during ipsilateral reach and in 24/70 during movements of each 47 limb; most of these latter cells (20/24) showed non-reciprocal changes in activity. Although 48 35/151 (23%) cells showed significant changes during the instructed delay period for reaches 49 made with at least one of the limbs, only 1 neuron showed a significant reciprocal change during 50 reaches with either limb. We suggest that the discharge characteristics of these PTNs are 51 compatible with our hypothesis that the motor cortex contributes to the production of the APAs 52 preceding movement. 53 54 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://jn.physiology.org/content/jn/early/2009/05/20/jn.00042.2009.full.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
