Invariants of the second transformation expressed in activation ranges

Article Abstract:

Target parameters and an arbitrary invariant are expressed as intersections between subpopulations of neurons performing the distance and elevation parts of the second transformation. Specification of a parameter value such as target distance determines a subpopulation of activation ranges. Choosing a subpopulation of activation ranges invariant over pointing movements may be a nervous system strategy for movement preparation.

Motor ability, Motor skills

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Reaching the point where you have to move a head

Article Abstract:

Major methodological issues are raised in response to Martha Flanders et al's research. There is a lack of evidence for a shoulder-centered coordinate system versus a head-centered one. Confounding variables are found in how Flanders decided on the location of the head coordinate system. The site chosen for a putative coordinate system is seen to introduce variability during head rotation.

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