Population computation of vectorial transformations
Neural Computation
Computational models for neuroscience
A Model of Reaching Dynamics in Primary Motor Cortex
Journal of Cognitive Neuroscience
Parameter extraction from population codes: A critical assessment
Neural Computation
Reduced representation by neural networks with restricted receptive fields
Neural Computation
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Recent evidence of population coding in motor cortex has ledsome researchers to claim that certain variables such as handdirection or force may be coded within a Cartesian coordinatesystem with respect to extra personal space. These claims are basedon the ability to predict the rectangular coordinates of handmovement direction using a "population vector" computed frommultiple cells' firing rates. I show here that such a populationvector can always be found given a very general set of assumptions.Therefore the existence of a population vector constitutes onlyweak support for the explicit use of a particular coordinaterepresentation by motor cortex.