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. Author manuscript; available in PMC: 2017 Dec 17.
Published in final edited form as: J Mot Behav. 2016 Sep 2;49(3):312–328. doi: 10.1080/00222895.2016.1204265

Figure 3.

Figure 3

Invariance of temporal scaling coefficients of muscle components. A-D: Color matrices summarize pairwise correlation coefficients between temporal scaling coefficients for the first four components extracted from data recorded during each of the 8 task conditions in monkeys. L, U, R, and D: left, up, right, down target locations, respectively; PR, WH: precision and whole-hand tasks, respectively. Note scale of color bar: -1 to C1. Scaling coefficients for component 1 (A) and component 3 (C) were conserved well across tasks and across monkeys. Scaling coefficients for component 2 (B) were relatively conserved within an animal for a given grasp type; results were mixed for comparisons across animals. Activation waveforms for component 4 (D, in monkey W only) were more strongly correlated for a given grasp type than across grasp types.