期刊
JOURNAL OF NEUROSCIENCE
卷 27, 期 19, 页码 5105-5114出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3570-06.2007
关键词
motor cortex; preferred direction; encoding; decoding; trajectory; regression
资金
- NINDS NIH HHS [R01 NS45853-01A2, R01 NS045853, N01-NS-2-2345] Funding Source: Medline
Previous studies have suggested that complex movements can be elicited by electrical stimulation of the motor cortex. Most recording studies in the motor cortex, however, have investigated the encoding of time-independent features of movement such as direction, velocity, position, or force. Here, we show that single motor cortical neurons encode temporally evolving movement trajectories and not simply instantaneous movement parameters. We explicitly characterize the preferred trajectories of individual neurons using a simple exponential encoding model and demonstrate that temporally extended trajectories not only capture the tuning of motor cortical neurons more accurately, but can be used to decode the instantaneous movement direction with less error. These findings suggest that single motor cortical neurons encode whole movement fragments, which are temporally extensive and can be quite complex.
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