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- W2163627919 endingPage "1393" @default.
- W2163627919 startingPage "1372" @default.
- W2163627919 abstract "To explore the possible cortical mechanisms underlying the 3-dimensional (3D) visuomotor transformation for reaching, we trained a 4-layer feed-forward artificial neural network to compute a reach vector (output) from the visual positions of both the hand and target viewed from different eye and head orientations (inputs). The emergent properties of the intermediate layers reflected several known neurophysiological findings, for example, gain field-like modulations and position-dependent shifting of receptive fields (RFs). We performed a reference frame analysis for each individual network unit, simulating standard electrophysiological experiments, that is, RF mapping (unit input), motor field mapping, and microstimulation effects (unit outputs). At the level of individual units (in both intermediate layers), the 3 different electrophysiological approaches identified different reference frames, demonstrating that these techniques reveal different neuronal properties and suggesting that a comparison across these techniques is required to understand the neural code of physiological networks. This analysis showed fixed input-output relationships within each layer and, more importantly, within each unit. These local reference frame transformation modules provide the basic elements for the global transformation; their parallel contributions are combined in a gain field-like fashion at the population level to implement both the linear and nonlinear elements of the 3D visuomotor transformation." @default.
- W2163627919 created "2016-06-24" @default.
- W2163627919 creator A5043137430 @default.
- W2163627919 creator A5044243996 @default.
- W2163627919 creator A5069659697 @default.
- W2163627919 date "2008-10-08" @default.
- W2163627919 modified "2023-10-06" @default.
- W2163627919 title "Decoding the Cortical Transformations for Visually Guided Reaching in 3D Space" @default.
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