HapticV1, PascalFrancis, Corpus, bibRecord, 000147

Learning to detect but not to grasp suppressed visual stimuli

Identifieur interne : 000147 ( PascalFrancis/Corpus ); précédent : 000146; suivant : 000148

Learning to detect but not to grasp suppressed visual stimuli

Auteurs : K. Ludwig ; P. Sterzer ; N. Kathmann ; V. H. Franz ; G. Hesselmann

Source :

Neuropsychologia [ 0028-3932 ] ; 2013.

RBID : Francis:14-0024294

Descripteurs français

Pascal (Inist)
- Apprentissage, Préhension, Détection, Mouvement corporel, Membre supérieur, Vision aveugle, Modèle, Conscience, Etude expérimentale, Homme.

English descriptors

KwdEn :
- Blindsight, Body movement, Consciousness, Detection, Experimental study, Gripping, Human, Learning, Models, Upper limb.

Abstract

A central implication of the two-visual-systems hypothesis (TVSH) is that the dorsal visuomotor system (vision-for-action) can make use of invisible information, whereas the ventral system (vision-for-perception) cannot (Milner & Goodale, 1995). Therefore, actions such as grasping movements should be influenced by invisible information while conscious reports remain unaffected. To test this assumption, we used a dichoptic stimulation technique - continuous flash suppression (CFS) - which has the potency to render stimuli invisible for up to seconds (Tsuchiya & Koch, 2005). In two experiments using CFS, participants were asked to grasp for invisible bars of different sizes (Experiment 1) or orientations (Experiment 2), or to report both measures verbally. Target visibility was measured trial-by-trial using the perceptual awareness scale (PAS). We found no evidence for the use of invisible information by the visuomotor system despite extensive training (600 trials) and the availability of haptic feedback. Participants neither learned to scale their maximum grip aperture to the size of the invisible stimulus, nor to align their hand to its orientation. Careful control of stimulus visibility across training sessions, however, revealed a robust tendency towards decreasing perceptual thresholds under CFS. We discuss our results within the framework of the TVSH and with respect to alternative models which emphasize the close functional interaction between the dorsal and ventral visual systems.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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Format Inist (serveur)

NO :	FRANCIS 14-0024294 INIST
ET :	Learning to detect but not to grasp suppressed visual stimuli
AU :	LUDWIG (K.); STERZER (P.); KATHMANN (N.); FRANZ (V. H.); HESSELMANN (G.)
AF :	Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité - Universitätsmedizin Berlin/Allemagne (1 aut., 2 aut., 5 aut.); Department of Psychology, Humboldt-Universität zu Berlin/Allemagne (1 aut., 3 aut.); Department of Psychology, Universltät Hamburg/Allemagne (4 aut.)
DT :	Publication en série; Niveau analytique
SO :	Neuropsychologia; ISSN 0028-3932; Coden NUPSA6; Royaume-Uni; Da. 2013; Vol. 51; No. 13; Pp. 2930-2938; Bibl. 1 p.
LA :	Anglais
EA :	A central implication of the two-visual-systems hypothesis (TVSH) is that the dorsal visuomotor system (vision-for-action) can make use of invisible information, whereas the ventral system (vision-for-perception) cannot (Milner & Goodale, 1995). Therefore, actions such as grasping movements should be influenced by invisible information while conscious reports remain unaffected. To test this assumption, we used a dichoptic stimulation technique - continuous flash suppression (CFS) - which has the potency to render stimuli invisible for up to seconds (Tsuchiya & Koch, 2005). In two experiments using CFS, participants were asked to grasp for invisible bars of different sizes (Experiment 1) or orientations (Experiment 2), or to report both measures verbally. Target visibility was measured trial-by-trial using the perceptual awareness scale (PAS). We found no evidence for the use of invisible information by the visuomotor system despite extensive training (600 trials) and the availability of haptic feedback. Participants neither learned to scale their maximum grip aperture to the size of the invisible stimulus, nor to align their hand to its orientation. Careful control of stimulus visibility across training sessions, however, revealed a robust tendency towards decreasing perceptual thresholds under CFS. We discuss our results within the framework of the TVSH and with respect to alternative models which emphasize the close functional interaction between the dorsal and ventral visual systems.
CC :	770B05C; 770B04D
FD :	Apprentissage; Préhension; Détection; Mouvement corporel; Membre supérieur; Vision aveugle; Modèle; Conscience; Etude expérimentale; Homme
FG :	Processus acquisition; Cognition; Motricité
ED :	Learning; Gripping; Detection; Body movement; Upper limb; Blindsight; Models; Consciousness; Experimental study; Human
EG :	Acquisition process; Cognition; Motricity
SD :	Aprendizaje; Prension; Detección; Movimiento corporal; Miembro superior; Visión ciega; Modelo; Conciencia; Estudio experimental; Hombre
LO :	INIST-11143.354000507432370460
ID :	14-0024294

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<server><NO>FRANCIS 14-0024294 INIST</NO>
<ET>Learning to detect but not to grasp suppressed visual stimuli</ET>
<AU>LUDWIG (K.); STERZER (P.); KATHMANN (N.); FRANZ (V. H.); HESSELMANN (G.)</AU>
<AF>Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité - Universitätsmedizin Berlin/Allemagne (1 aut., 2 aut., 5 aut.); Department of Psychology, Humboldt-Universität zu Berlin/Allemagne (1 aut., 3 aut.); Department of Psychology, Universltät Hamburg/Allemagne (4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Neuropsychologia; ISSN 0028-3932; Coden NUPSA6; Royaume-Uni; Da. 2013; Vol. 51; No. 13; Pp. 2930-2938; Bibl. 1 p.</SO>
<LA>Anglais</LA>
<EA>A central implication of the two-visual-systems hypothesis (TVSH) is that the dorsal visuomotor system (vision-for-action) can make use of invisible information, whereas the ventral system (vision-for-perception) cannot (Milner & Goodale, 1995). Therefore, actions such as grasping movements should be influenced by invisible information while conscious reports remain unaffected. To test this assumption, we used a dichoptic stimulation technique - continuous flash suppression (CFS) - which has the potency to render stimuli invisible for up to seconds (Tsuchiya & Koch, 2005). In two experiments using CFS, participants were asked to grasp for invisible bars of different sizes (Experiment 1) or orientations (Experiment 2), or to report both measures verbally. Target visibility was measured trial-by-trial using the perceptual awareness scale (PAS). We found no evidence for the use of invisible information by the visuomotor system despite extensive training (600 trials) and the availability of haptic feedback. Participants neither learned to scale their maximum grip aperture to the size of the invisible stimulus, nor to align their hand to its orientation. Careful control of stimulus visibility across training sessions, however, revealed a robust tendency towards decreasing perceptual thresholds under CFS. We discuss our results within the framework of the TVSH and with respect to alternative models which emphasize the close functional interaction between the dorsal and ventral visual systems.</EA>
<CC>770B05C; 770B04D</CC>
<FD>Apprentissage; Préhension; Détection; Mouvement corporel; Membre supérieur; Vision aveugle; Modèle; Conscience; Etude expérimentale; Homme</FD>
<FG>Processus acquisition; Cognition; Motricité</FG>
<ED>Learning; Gripping; Detection; Body movement; Upper limb; Blindsight; Models; Consciousness; Experimental study; Human</ED>
<EG>Acquisition process; Cognition; Motricity</EG>
<SD>Aprendizaje; Prension; Detección; Movimiento corporal; Miembro superior; Visión ciega; Modelo; Conciencia; Estudio experimental; Hombre</SD>
<LO>INIST-11143.354000507432370460</LO>
<ID>14-0024294</ID>
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Learning to detect but not to grasp suppressed visual stimuli

Learning to detect but not to grasp suppressed visual stimuli

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