Learning to detect but not to grasp suppressed visual stimuli.
Identifieur interne : 002990 ( Ncbi/Curation ); précédent : 002989; suivant : 002991Learning to detect but not to grasp suppressed visual stimuli.
Auteurs : K. Ludwig [Allemagne] ; P. Sterzer ; N. Kathmann ; V H Franz ; G. HesselmannSource :
- Neuropsychologia [ 1873-3514 ] ; 2013.
English descriptors
- KwdEn :
- MESH :
- physiology : Biomechanical Phenomena, Hand Strength, Learning, Perceptual Masking, Visual Perception.
- Adult, Female, Humans, Male, Movement, Photic Stimulation, Young Adult.
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.
DOI: 10.1016/j.neuropsychologia.2013.09.035
PubMed: 24096175
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Electronic address: karin.ludwig@charite.de.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité - Universitätsmedizin Berlin, Germany; Department of Psychology, Humboldt-Universität zu Berlin</wicri:regionArea><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion></affiliation></author><author><name sortKey="Sterzer, P" sort="Sterzer, P" uniqKey="Sterzer P" first="P" last="Sterzer">P. Sterzer</name></author><author><name sortKey="Kathmann, N" sort="Kathmann, N" uniqKey="Kathmann N" first="N" last="Kathmann">N. 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Ludwig</name><affiliation wicri:level="1"><nlm:affiliation>Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité - Universitätsmedizin Berlin, Germany; Department of Psychology, Humboldt-Universität zu Berlin, Germany. Electronic address: karin.ludwig@charite.de.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité - Universitätsmedizin Berlin, Germany; Department of Psychology, Humboldt-Universität zu Berlin</wicri:regionArea><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion><wicri:noRegion>Humboldt-Universität zu Berlin</wicri:noRegion></affiliation></author><author><name sortKey="Sterzer, P" sort="Sterzer, P" uniqKey="Sterzer P" first="P" last="Sterzer">P. Sterzer</name></author><author><name sortKey="Kathmann, N" sort="Kathmann, N" uniqKey="Kathmann N" first="N" last="Kathmann">N. Kathmann</name></author><author><name sortKey="Franz, V H" sort="Franz, V H" uniqKey="Franz V" first="V H" last="Franz">V H Franz</name></author><author><name sortKey="Hesselmann, G" sort="Hesselmann, G" uniqKey="Hesselmann G" first="G" last="Hesselmann">G. Hesselmann</name></author></analytic><series><title level="j">Neuropsychologia</title><idno type="eISSN">1873-3514</idno><imprint><date when="2013" type="published">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Biomechanical Phenomena (physiology)</term><term>Female</term><term>Hand Strength (physiology)</term><term>Humans</term><term>Learning (physiology)</term><term>Male</term><term>Movement</term><term>Perceptual Masking (physiology)</term><term>Photic Stimulation</term><term>Visual Perception (physiology)</term><term>Young Adult</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Biomechanical Phenomena</term><term>Hand Strength</term><term>Learning</term><term>Perceptual Masking</term><term>Visual Perception</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Female</term><term>Humans</term><term>Male</term><term>Movement</term><term>Photic Stimulation</term><term>Young Adult</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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. 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