Analysis of pointing errors reveals properties of data representations and coordinate transformations within the central nervous system

J. McIntyre, F. Stratta, J. Droulez, F. Lacquaniti

Research output: Contribution to journalArticle

Abstract

The execution of a simple pointing task invokes a chain of processing that includes visual acquisition of the target, coordination of multimodal proprioceptive signals, and ultimately the generation of a motor command that will drive the finger to the desired target location. These processes in the sensorimotor chain can be described in terms of internal representations of the target or limb positions and coordinate transformations between different internal reference frames. In this article we first describe how different types of error analysis can be used to identify properties of the internal representations and coordinate transformations within the central nervous system. We then describe a series of experiments in which subjects pointed to remembered 3D visual targets under two lighting conditions (dim light and total darkness) and after two different memory delays (0.5 and 5.0 s) and report results in terms of variable error, constant error, and local distortion. Finally, we present a set of simulations to help explain the patterns of errors produced in this pointing task. These analyses and experiments provide insight into the structure of the underlying sensorimotor processes employed by the central nervous system.

Original languageEnglish
Pages (from-to)2823-2855
Number of pages33
JournalNeural Computation
Volume12
Issue number12
Publication statusPublished - Dec 2000

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Neurology
Central Nervous System
Darkness
Lighting
Fingers
Extremities
Light
Error analysis
Experiments
Data storage equipment
Processing
Drive
Experiment
Sensorimotor

ASJC Scopus subject areas

  • Artificial Intelligence
  • Control and Systems Engineering
  • Neuroscience(all)

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Analysis of pointing errors reveals properties of data representations and coordinate transformations within the central nervous system. / McIntyre, J.; Stratta, F.; Droulez, J.; Lacquaniti, F.

In: Neural Computation, Vol. 12, No. 12, 12.2000, p. 2823-2855.

Research output: Contribution to journalArticle

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