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The Journal of Neuroscience, April 4, 2007, 27(14):3894-3903; doi:10.1523/JNEUROSCI.4693-06.2007

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Behavioral/Systems/Cognitive
Choice of Contact Points during Multidigit Grasping: Effect of Predictability of Object Center of Mass Location

Jamie Lukos,¹ Caterina Ansuini,³ and Marco Santello^1,2

¹Department of Kinesiology and ²The Harrington Department of Bioengineering, Arizona State University, Tempe, Arizona 85287, and ³Dipartimento di Psicologia Generale, Università di Padova, 35131 Padova, Italy

Correspondence should be addressed to Marco Santello, Department of Kinesiology, Arizona State University, Tempe, AZ 85287-0404. Email: marco.santello{at}asu.edu

It has been shown that when subjects can predict object properties [e.g., weight or center of mass (CM)], fingertip forces are appropriately scaled before the object is lifted, i.e., before somatosensory feedback can be processed. However, it is not known whether subjects, in addition to these anticipatory force mechanisms, exploit the ability to choose where digits can be placed to facilitate object manipulation. We addressed this question by asking subjects to reach and grasp an object whose CM was changed to the left, center, or right of the object in either a predictable or unpredictable manner. The only task requirement was to minimize object roll during lift. We hypothesized that subjects would modulate contact points but only when object CM location could be predicted. As expected, object roll was significantly smaller in the predictable condition. This experimental condition was also associated with statistically distinct spatial distributions of contact points as a function of object CM location but primarily when large torques had to be counteracted, i.e., for right and left CM locations. In contrast, when subjects could not anticipate CM location, a "default" distribution of contact points was used, this being statistically indistinguishable from that adopted for the center CM location in the predictable condition. We conclude that choice of contact points is integrated with anticipatory force control mechanisms to facilitate object manipulation. These results demonstrate that planning of digit placement is an important component of grasp control.

Key words: hand; reaching; kinematics; fingertips; feedback; anticipation

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Received Oct. 27, 2006; revised March 6, 2007; accepted March 7, 2007.

Correspondence should be addressed to Marco Santello, Department of Kinesiology, Arizona State University, Tempe, AZ 85287-0404. Email: marco.santello{at}asu.edu

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