TY - JOUR
T1 - Somatotopic localization of thermal stimuli
T2 - I. A comparison of within- versus across-dermatomal separation of innocuous thermal stimuli
AU - Lee, David K.
AU - McGillis, Sandra L.B.
AU - Greenspan, Joel D.
N1 - Funding Information:
This project was supported by NIH Grant No. NS-28559.
PY - 1996
Y1 - 1996
N2 - Fourteen healthy subjects (4 males, 10 females) were asked to localize a thermal stimulus applied to the left distal forearm. Two temperature-controlled probes (1.2-cm2 area each) were strapped to the forearm, separated by 8 cm. The probes were positioned in one of three ways: (1) longitudinally within the C6 dermatome, (2) longitudinally within the C8 dermatomes, and (3) transversely with one probe within the C6 and one probe within the C8 dermatome. For any given stimulus configuration, cooling stimuli were localized significantly better than warming stimuli. For both warming and cooling, the transdermatomal configuration (transversely separated probes) provided significantly better localization than the intradermatomal configuration (longitudinally separated probes). Thus, the anisotropy that has been described for tactile spatial acuity is also present for thermal localization. These results suggest that cutaneous somatotopic information is integrated similarly for both tactile and thermal stimuli, but differently within versus across dermatomes.
AB - Fourteen healthy subjects (4 males, 10 females) were asked to localize a thermal stimulus applied to the left distal forearm. Two temperature-controlled probes (1.2-cm2 area each) were strapped to the forearm, separated by 8 cm. The probes were positioned in one of three ways: (1) longitudinally within the C6 dermatome, (2) longitudinally within the C8 dermatomes, and (3) transversely with one probe within the C6 and one probe within the C8 dermatome. For any given stimulus configuration, cooling stimuli were localized significantly better than warming stimuli. For both warming and cooling, the transdermatomal configuration (transversely separated probes) provided significantly better localization than the intradermatomal configuration (longitudinally separated probes). Thus, the anisotropy that has been described for tactile spatial acuity is also present for thermal localization. These results suggest that cutaneous somatotopic information is integrated similarly for both tactile and thermal stimuli, but differently within versus across dermatomes.
KW - Psychophysics
KW - Somatotopy
KW - Spatial discrimination
KW - Thermoreception
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U2 - 10.3109/08990229609028913
DO - 10.3109/08990229609028913
M3 - Article
C2 - 8725650
AN - SCOPUS:0030015278
SN - 0899-0220
VL - 13
SP - 67
EP - 71
JO - Somatosensory and Motor Research
JF - Somatosensory and Motor Research
IS - 1
ER -