SA1 and RA Afferent Responses to Static and Vibrating Gratings
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Auteurs : S. J. Bensmaïa [États-Unis] ; J. C. Craig [États-Unis] ; T. Yoshioka ; K. O. Johnson [États-Unis]Source :
- Journal of neurophysiology [ 0022-3077 ] ; 2005.
Abstract
SA1 and RA afferent fibers differ both in their ability to convey information about the fine spatial structure of tactile stimuli and in their frequency sensitivity profiles. In the present study, we investigated the extent to which the spatial resolution of the signal conveyed by SA1 and RA fibers depends on the temporal properties of the stimulus. To that end, we recorded the responses evoked in SA1 and RA fibers of macaques by static and vibrating gratings that varied in spatial period, vibratory frequency, and amplitude. Gratings were oriented either parallel to the long axis of the finger (vertical) or perpendicular to it (horizontal). We examined the degree to which afferent responses were dependent on the spatial period, vibratory frequency, amplitude, and orientation of the gratings. We found that the spatial modulation of the afferent responses increased as the spatial period of the gratings increased; the spatial modulation was the same for static and vibrating gratings, despite large differences in evoked spike rates; the spatial modulation in SA1 responses was independent of stimulus amplitude over the range of amplitudes tested, whereas RA modulation decreased slightly as the stimulus amplitude increased; vertical gratings evoked stronger and more highly modulated responses than horizontal gratings; the modulation in SA1 responses was higher than that in RA responses at all frequencies and amplitudes. The behavioral consequences of these neurophysiological findings are examined in a companion paper.
Url:
DOI: 10.1152/jn.00877.2005
PubMed: 16236779
PubMed Central: 1839046
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<front><div type="abstract" xml:lang="en"><p id="P1">SA1 and RA afferent fibers differ both in their ability to convey information about the fine spatial structure of tactile stimuli and in their frequency sensitivity profiles. In the present study, we investigated the extent to which the spatial resolution of the signal conveyed by SA1 and RA fibers depends on the temporal properties of the stimulus. To that end, we recorded the responses evoked in SA1 and RA fibers of macaques by static and vibrating gratings that varied in spatial period, vibratory frequency, and amplitude. Gratings were oriented either parallel to the long axis of the finger (vertical) or perpendicular to it (horizontal). We examined the degree to which afferent responses were dependent on the spatial period, vibratory frequency, amplitude, and orientation of the gratings. We found that the spatial modulation of the afferent responses increased as the spatial period of the gratings increased; the spatial modulation was the same for static and vibrating gratings, despite large differences in evoked spike rates; the spatial modulation in SA1 responses was independent of stimulus amplitude over the range of amplitudes tested, whereas RA modulation decreased slightly as the stimulus amplitude increased; vertical gratings evoked stronger and more highly modulated responses than horizontal gratings; the modulation in SA1 responses was higher than that in RA responses at all frequencies and amplitudes. The behavioral consequences of these neurophysiological findings are examined in a companion paper.</p>
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<title-group><article-title>SA1 and RA Afferent Responses to Static and Vibrating Gratings</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Bensmaïa</surname>
<given-names>S. J.</given-names>
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<xref rid="A2" ref-type="aff">2</xref>
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<given-names>J. C.</given-names>
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<xref rid="A3" ref-type="aff">3</xref>
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<given-names>T.</given-names>
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Mind Brain Institute and</aff>
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Department of Neuroscience, Johns Hopkins University, Baltimore, Maryland; and</aff>
<aff id="A3"><label>3</label>
Department of Psychology, Indiana University, Bloomington, Indiana</aff>
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<author-notes><corresp id="FN1">Address for reprint requests and other correspondence: S. J. Bensmaia, Johns Hopkins University, 3400 N. Charles St., Krieger 338, Baltimore, MD 21218 (E-mail: <email>sliman@jhu.edu</email>
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<pub-date pub-type="nihms-submitted"><day>12</day>
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<month>10</month>
<year>2005</year>
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<pub-date pub-type="ppub"><month>3</month>
<year>2006</year>
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<pub-date pub-type="pmc-release"><day>29</day>
<month>3</month>
<year>2007</year>
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<volume>95</volume>
<issue>3</issue>
<fpage>1771</fpage>
<lpage>1782</lpage>
<abstract><p id="P1">SA1 and RA afferent fibers differ both in their ability to convey information about the fine spatial structure of tactile stimuli and in their frequency sensitivity profiles. In the present study, we investigated the extent to which the spatial resolution of the signal conveyed by SA1 and RA fibers depends on the temporal properties of the stimulus. To that end, we recorded the responses evoked in SA1 and RA fibers of macaques by static and vibrating gratings that varied in spatial period, vibratory frequency, and amplitude. Gratings were oriented either parallel to the long axis of the finger (vertical) or perpendicular to it (horizontal). We examined the degree to which afferent responses were dependent on the spatial period, vibratory frequency, amplitude, and orientation of the gratings. We found that the spatial modulation of the afferent responses increased as the spatial period of the gratings increased; the spatial modulation was the same for static and vibrating gratings, despite large differences in evoked spike rates; the spatial modulation in SA1 responses was independent of stimulus amplitude over the range of amplitudes tested, whereas RA modulation decreased slightly as the stimulus amplitude increased; vertical gratings evoked stronger and more highly modulated responses than horizontal gratings; the modulation in SA1 responses was higher than that in RA responses at all frequencies and amplitudes. The behavioral consequences of these neurophysiological findings are examined in a companion paper.</p>
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<contract-num rid="NS1">P01 NS038034-040003</contract-num>
<contract-sponsor id="NS1">National Institute of Neurological Disorders and Stroke : NINDS</contract-sponsor>
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