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Information about Complex Fingertip Parameters in Individual Human Tactile Afferent Neurons.pdf3.64 MBAdobe PDFView/Open
Title: Information about Complex Fingertip Parameters in Individual Human Tactile Afferent Neurons
Authors: Saal, Hannes
Vijayakumar, Sethu
Johansson, Roland
Issue Date: 2009
Journal Title: The Journal of Neuroscience
Volume: 29
Issue: 25
Page Numbers: 8022-8031
Publisher: Society for Neuroscience
Abstract: Although information in tactile afferent neurons represented by firing rates has been studied extensively over nearly a century, recent studies suggest that precise spike timing might be more important than firing rates. Here, we used information theory to compare the information content in the discharges of 92 tactile afferents distributed over the entire terminal segment of the fingertip when it was contacted by surfaces with different curvatures and force directions representative of everyday manipulations. Estimates of the information content with regard to curvature and force direction based on the precise timing of spikes were at least 2.2 times and 1.6 times, respectively, larger than that of spike counts during a 125 ms period of force increase. Moreover, the information regarding force direction based on the timing of the very first elicited spike was comparable with that provided by spike counts and more than twice as large with respect to object shape. For all encoding schemes, afferents terminating close to the stimulation site tended to convey more information about surface curvature than more remote afferents that tended to convey more information about force direction. Finally, coding schemes based on spike timing and spike counts overall contributed mostly independent information. We conclude that information about tactile stimuli in timing of spikes in primary afferents, even if limited to the first spikes, surpasses that contained in firing rates and that these measures of afferents’ responses might capture different aspects of the stimulus.
ISSN: 02706474
Appears in Collections:Informatics Publications

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