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[0] Francis JT, Influence of the inter-reach-interval on motor learning.Exp Brain Res 167:1, 128-31 (2005 Nov)

[0] Scott SH, Optimal feedback control and the neural basis of volitional motor control.Nat Rev Neurosci 5:7, 532-46 (2004 Jul)

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ref: Chestek-2007.1 tags: M1 cortex reaching tuning date: 01-15-2012 22:08 gmt revision:1 [0] [head]

PMID-17913908[0] Single-Neuron Stability during Repeated Reaching in Macaque Premotor Cortex

  • Neural activity was predominantly stable over time in all measured properties: firing rate, directional tuning, and contribution to a decoding model that predicted kinematics from neural activity. The small changes in neural activity that we did observe could be accounted for primarily by subtle changes in behavior. We conclude that the relationship between neural activity and practiced behavior is reasonably stable, at least on timescales of minutes up to 48 h.
    • Makes sense.
    • Good for neuroprosthetics.


[0] Chestek CA, Batista AP, Santhanam G, Yu BM, Afshar A, Cunningham JP, Gilja V, Ryu SI, Churchland MM, Shenoy KV, Single-neuron stability during repeated reaching in macaque premotor cortex.J Neurosci 27:40, 10742-50 (2007 Oct 3)

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ref: bookmark-0 tags: typing keyboard bitrate probability reaching bandwidth date: 12-07-2011 02:35 gmt revision:3 [2] [1] [0] [head]

From Scott MacKenzie:

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ref: Francis-2005.11 tags: Joe_Francis motor_learning reaching humans delay intertrial interval date: 04-09-2007 22:48 gmt revision:1 [0] [head]

PMID-16132970[0] The Influence of the Inter-Reach-Interval on Motor Learning.

Previous studies have demonstrated changes in motor memories with the passage of time on the order of hours. We sought to further this work by determining the influence that time on the order of seconds has on motor learning by changing the duration between successive reaches (inter-reach-interval IRI). Human subjects made reaching movements to visual targets while holding onto a robotic manipulandum that presented a viscous curl field. We tested four experimental groups that differed with respect to the IRI (0.5, 5, 10 or 20 sec). The 0.5 sec IRI group performed significantly worse with respect to a learning index than the other groups over the first set of 192 reaches. Each group demonstrated significant learning during the first set. There was no significant difference with respect to the learning index between the 5, 10 or 20 sec IRI groups. During the second and third set of 192 reaches the 0.5 sec IRI group's performance became indistinguishable from the other groups indicating that fatigue did not cause the initial poor performance and that with continued training the initial deficit in performance could be overcome.


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ref: Scott-2004.07 tags: Scott motor control optimal feedback cortex reaching dynamics review date: 04-09-2007 22:40 gmt revision:1 [0] [head]

PMID-15208695[0] PDF HTML summary Optimal feedback control and the neural basis of volitional motor control by Stephen S. Scott