Representation of Object Size in the Somatosensory System
Identifieur interne : 001665 ( Pmc/Curation ); précédent : 001664; suivant : 001666Representation of Object Size in the Somatosensory System
Auteurs : L. J. Berryman [États-Unis] ; J. M. Yau ; S. S. Hsiao [États-Unis]Source :
- Journal of neurophysiology [ 0022-3077 ] ; 2006.
Abstract
In this study we investigate the haptic perception of object size. We report the results from four psychophysical experiments. In the first, we ask subjects to discriminate the size of objects that vary in surface curvature and compliance while changing contact force. We show that objects exhibit size constancy such that perception of object size using haptics does not change with changes in contact force. Based on these results, we hypothesize that size perception depends on the degree of spread between the digits at initial contact with objects. In the second experiment, we test this hypothesis by having subjects continuously contact an object that changes dynamically in size. We show that size perception takes into account the compliance of the object. In the third and fourth experiments we attempt to separate the individual contributions of proprioceptive and cutaneous input. In the third, we test the ability of subjects to perceive object size after altering the sensitivity of cutaneous receptors with adapting vibratory stimuli. The results from this experiment suggest that initial contact is signaled by the cutaneous slowly adapting type 1 afferents (SA1) and/or the rapidly adapting afferents (RA). In the last experiment, we block cutaneous input at the site of contact by anesthetizing the digital nerves and show that proprioceptive information alone provides only a rough estimate of object size. We conclude that the perception of object size depends on inputs from SA1 and possibly RA afferents, combined with inputs from proprioceptive afferents that signal the spread between digits.
Url:
DOI: 10.1152/jn.01190.2005
PubMed: 16641375
PubMed Central: 1800882
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<front><div type="abstract" xml:lang="en"><p id="P1">In this study we investigate the haptic perception of object size. We
report the results from four psychophysical experiments. In the first, we ask
subjects to discriminate the size of objects that vary in surface curvature and
compliance while changing contact force. We show that objects exhibit size
constancy such that perception of object size using haptics does not change with
changes in contact force. Based on these results, we hypothesize that size
perception depends on the degree of spread between the digits at initial contact
with objects. In the second experiment, we test this hypothesis by having
subjects continuously contact an object that changes dynamically in size. We
show that size perception takes into account the compliance of the object. In
the third and fourth experiments we attempt to separate the individual
contributions of proprioceptive and cutaneous input. In the third, we test the
ability of subjects to perceive object size after altering the sensitivity of
cutaneous receptors with adapting vibratory stimuli. The results from this
experiment suggest that initial contact is signaled by the cutaneous slowly
adapting type 1 afferents (SA1) and/or the rapidly adapting afferents (RA). In
the last experiment, we block cutaneous input at the site of contact by
anesthetizing the digital nerves and show that proprioceptive information alone
provides only a rough estimate of object size. We conclude that the perception
of object size depends on inputs from SA1 and possibly RA afferents, combined
with inputs from proprioceptive afferents that signal the spread between
digits.</p>
</div>
</front>
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<title-group><article-title>Representation of Object Size in the Somatosensory
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<contrib-group><contrib contrib-type="author"><name><surname>Berryman</surname>
<given-names>L. J.</given-names>
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<xref rid="A2" ref-type="aff">2</xref>
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<contrib contrib-type="author"><name><surname>Yau</surname>
<given-names>J. M.</given-names>
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<xref rid="A1" ref-type="aff">1</xref>
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<contrib contrib-type="author"><name><surname>Hsiao</surname>
<given-names>S. S.</given-names>
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<xref rid="A1" ref-type="aff">1</xref>
<xref rid="A2" ref-type="aff">2</xref>
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<aff id="A1"><label>1</label>
Department of Neuroscience and</aff>
<aff id="A2"><label>2</label>
Department of Biomedical Engineering, Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland</aff>
</contrib-group>
<author-notes><corresp id="FN1">Address for reprint requests and other correspondence: S. Hsiao,
Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, 338 Krieger Hall,
3400 N. Charles St., Baltimore, MD 21218 (E-mail:
<email>Steven.Hsiao@jhu.edu</email>
).</corresp>
</author-notes>
<pub-date pub-type="nihms-submitted"><day>12</day>
<month>1</month>
<year>2007</year>
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<pub-date pub-type="epub"><day>26</day>
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<pub-date pub-type="pmc-release"><day>1</day>
<month>7</month>
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<volume>96</volume>
<issue>1</issue>
<fpage>27</fpage>
<lpage>39</lpage>
<abstract><p id="P1">In this study we investigate the haptic perception of object size. We
report the results from four psychophysical experiments. In the first, we ask
subjects to discriminate the size of objects that vary in surface curvature and
compliance while changing contact force. We show that objects exhibit size
constancy such that perception of object size using haptics does not change with
changes in contact force. Based on these results, we hypothesize that size
perception depends on the degree of spread between the digits at initial contact
with objects. In the second experiment, we test this hypothesis by having
subjects continuously contact an object that changes dynamically in size. We
show that size perception takes into account the compliance of the object. In
the third and fourth experiments we attempt to separate the individual
contributions of proprioceptive and cutaneous input. In the third, we test the
ability of subjects to perceive object size after altering the sensitivity of
cutaneous receptors with adapting vibratory stimuli. The results from this
experiment suggest that initial contact is signaled by the cutaneous slowly
adapting type 1 afferents (SA1) and/or the rapidly adapting afferents (RA). In
the last experiment, we block cutaneous input at the site of contact by
anesthetizing the digital nerves and show that proprioceptive information alone
provides only a rough estimate of object size. We conclude that the perception
of object size depends on inputs from SA1 and possibly RA afferents, combined
with inputs from proprioceptive afferents that signal the spread between
digits.</p>
</abstract>
<contract-num rid="NS1">R01 NS034086-11</contract-num>
<contract-num rid="NS1">R01 NS034086-10</contract-num>
<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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