Tactile acuity in the blind: A closer look reveals superiority over the sighted in some but not all cutaneous tasks
Identifieur interne : 000865 ( PascalFrancis/Corpus ); précédent : 000864; suivant : 000866Tactile acuity in the blind: A closer look reveals superiority over the sighted in some but not all cutaneous tasks
Auteurs : Flamine Alary ; Marco Duquette ; Rachel Goldstein ; C. Elaine Chapman ; Patrice Voss ; Valérie La Buissonniere-Ariza ; Franco LeporeSource :
- Neuropsychologia [ 0028-3932 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Previous studies have shown that blind subjects may outperform the sighted on certain tactile discrimination tasks. We recently showed that blind subjects outperformed the sighted in a haptic 2D-angle discrimination task. The purpose of this study was to compare the performance of the same blind (n = 16) and sighted (n=17, G1) subjects in three tactile discrimination tasks dependent solely on cutaneous inputs from the fingertip of the index finger, D2. A second group of sighted subjects (n=30, G2) were also tested. Texture discrimination thresholds were 0.62 (Gl)-0.80mm (G2) for the sighted subjects, and 0.64mm for the blind (standard, 2mm spatial period). Grating orientation thresholds were 0.99 (G1)-1.12 mm (G2) for the sighted subjects, and 0.96 mm for the blind. Finally, vibrotactile frequency discrimination thresholds (100 Hz standard) were 19.5 (G2) and 20.0 Hz (G1) for the sighted, and 16.5 Hz for the blind subjects. There were no significant differences in performance between the blind and the sighted subjects for the grating orientation or vibrotactile frequency discrimination tasks. In contrast, blind subjects outperformed the sighted for the texture discrimination task (G2 only), possibly reflecting the fact that the raised dot surfaces were similar to the dots forming Braille characters (all were fluent Braille readers).
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NO : | FRANCIS 09-0328332 INIST |
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ET : | Tactile acuity in the blind: A closer look reveals superiority over the sighted in some but not all cutaneous tasks |
AU : | ALARY (Flamine); DUQUETTE (Marco); GOLDSTEIN (Rachel); CHAPMAN (C. Elaine); VOSS (Patrice); LA BUISSONNIERE-ARIZA (Valérie); LEPORE (Franco) |
AF : | Centre de Recherche en Neuropsychologie et Cognition (CERNEC), Département de Psychologie, Université de Montréal, CP 6128, Succ. Centre-Ville/Montréal, QC, H3C 3J7/Canada (1 aut., 2 aut., 3 aut., 5 aut., 6 aut., 7 aut.); Groupe de Recherche sur le Système Nerveux Central, Département de Physiologie, Faculté de Médecine, Université de Montréal, CP 6128, Succ. Centre-Ville/Montréal, QC, H3C 3J7/Canada (4 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Neuropsychologia; ISSN 0028-3932; Coden NUPSA6; Royaume-Uni; Da. 2009; Vol. 47; No. 10; Pp. 2037-2043; Bibl. 3/4 p. |
LA : | Anglais |
EA : | Previous studies have shown that blind subjects may outperform the sighted on certain tactile discrimination tasks. We recently showed that blind subjects outperformed the sighted in a haptic 2D-angle discrimination task. The purpose of this study was to compare the performance of the same blind (n = 16) and sighted (n=17, G1) subjects in three tactile discrimination tasks dependent solely on cutaneous inputs from the fingertip of the index finger, D2. A second group of sighted subjects (n=30, G2) were also tested. Texture discrimination thresholds were 0.62 (Gl)-0.80mm (G2) for the sighted subjects, and 0.64mm for the blind (standard, 2mm spatial period). Grating orientation thresholds were 0.99 (G1)-1.12 mm (G2) for the sighted subjects, and 0.96 mm for the blind. Finally, vibrotactile frequency discrimination thresholds (100 Hz standard) were 19.5 (G2) and 20.0 Hz (G1) for the sighted, and 16.5 Hz for the blind subjects. There were no significant differences in performance between the blind and the sighted subjects for the grating orientation or vibrotactile frequency discrimination tasks. In contrast, blind subjects outperformed the sighted for the texture discrimination task (G2 only), possibly reflecting the fact that the raised dot surfaces were similar to the dots forming Braille characters (all were fluent Braille readers). |
CC : | 770B14D; 770B05E |
FD : | Sensibilité tactile; Psychophysique; Cécité; Homme |
FG : | Perception; Pathologie de l'oeil; Trouble de la vision |
ED : | Tactile sensitivity; Psychophysics; Blindness; Human |
EG : | Perception; Eye disease; Vision disorder |
SD : | Sensibilidad tactil; Psicofísica; Ceguera; Hombre |
LO : | INIST-11143.354000187978200030 |
ID : | 09-0328332 |
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<front><div type="abstract" xml:lang="en">Previous studies have shown that blind subjects may outperform the sighted on certain tactile discrimination tasks. We recently showed that blind subjects outperformed the sighted in a haptic 2D-angle discrimination task. The purpose of this study was to compare the performance of the same blind (n = 16) and sighted (n=17, G1) subjects in three tactile discrimination tasks dependent solely on cutaneous inputs from the fingertip of the index finger, D2. A second group of sighted subjects (n=30, G2) were also tested. Texture discrimination thresholds were 0.62 (Gl)-0.80mm (G2) for the sighted subjects, and 0.64mm for the blind (standard, 2mm spatial period). Grating orientation thresholds were 0.99 (G1)-1.12 mm (G2) for the sighted subjects, and 0.96 mm for the blind. Finally, vibrotactile frequency discrimination thresholds (100 Hz standard) were 19.5 (G2) and 20.0 Hz (G1) for the sighted, and 16.5 Hz for the blind subjects. There were no significant differences in performance between the blind and the sighted subjects for the grating orientation or vibrotactile frequency discrimination tasks. In contrast, blind subjects outperformed the sighted for the texture discrimination task (G2 only), possibly reflecting the fact that the raised dot surfaces were similar to the dots forming Braille characters (all were fluent Braille readers).</div>
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<server><NO>FRANCIS 09-0328332 INIST</NO>
<ET>Tactile acuity in the blind: A closer look reveals superiority over the sighted in some but not all cutaneous tasks</ET>
<AU>ALARY (Flamine); DUQUETTE (Marco); GOLDSTEIN (Rachel); CHAPMAN (C. Elaine); VOSS (Patrice); LA BUISSONNIERE-ARIZA (Valérie); LEPORE (Franco)</AU>
<AF>Centre de Recherche en Neuropsychologie et Cognition (CERNEC), Département de Psychologie, Université de Montréal, CP 6128, Succ. Centre-Ville/Montréal, QC, H3C 3J7/Canada (1 aut., 2 aut., 3 aut., 5 aut., 6 aut., 7 aut.); Groupe de Recherche sur le Système Nerveux Central, Département de Physiologie, Faculté de Médecine, Université de Montréal, CP 6128, Succ. Centre-Ville/Montréal, QC, H3C 3J7/Canada (4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Neuropsychologia; ISSN 0028-3932; Coden NUPSA6; Royaume-Uni; Da. 2009; Vol. 47; No. 10; Pp. 2037-2043; Bibl. 3/4 p.</SO>
<LA>Anglais</LA>
<EA>Previous studies have shown that blind subjects may outperform the sighted on certain tactile discrimination tasks. We recently showed that blind subjects outperformed the sighted in a haptic 2D-angle discrimination task. The purpose of this study was to compare the performance of the same blind (n = 16) and sighted (n=17, G1) subjects in three tactile discrimination tasks dependent solely on cutaneous inputs from the fingertip of the index finger, D2. A second group of sighted subjects (n=30, G2) were also tested. Texture discrimination thresholds were 0.62 (Gl)-0.80mm (G2) for the sighted subjects, and 0.64mm for the blind (standard, 2mm spatial period). Grating orientation thresholds were 0.99 (G1)-1.12 mm (G2) for the sighted subjects, and 0.96 mm for the blind. Finally, vibrotactile frequency discrimination thresholds (100 Hz standard) were 19.5 (G2) and 20.0 Hz (G1) for the sighted, and 16.5 Hz for the blind subjects. There were no significant differences in performance between the blind and the sighted subjects for the grating orientation or vibrotactile frequency discrimination tasks. In contrast, blind subjects outperformed the sighted for the texture discrimination task (G2 only), possibly reflecting the fact that the raised dot surfaces were similar to the dots forming Braille characters (all were fluent Braille readers).</EA>
<CC>770B14D; 770B05E</CC>
<FD>Sensibilité tactile; Psychophysique; Cécité; Homme</FD>
<FG>Perception; Pathologie de l'oeil; Trouble de la vision</FG>
<ED>Tactile sensitivity; Psychophysics; Blindness; Human</ED>
<EG>Perception; Eye disease; Vision disorder</EG>
<SD>Sensibilidad tactil; Psicofísica; Ceguera; Hombre</SD>
<LO>INIST-11143.354000187978200030</LO>
<ID>09-0328332</ID>
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