Real-time vision, tactile cues, and visual form agnosia: removing haptic feedback from a "natural" grasping task induces pantomime-like grasps.
Identifieur interne : 000336 ( PubMed/Corpus ); précédent : 000335; suivant : 000337Real-time vision, tactile cues, and visual form agnosia: removing haptic feedback from a "natural" grasping task induces pantomime-like grasps.
Auteurs : Robert L. Whitwell ; Tzvi Ganel ; Caitlin M. Byrne ; Melvyn A. GoodaleSource :
- Frontiers in human neuroscience [ 1662-5161 ] ; 2015.
Abstract
Investigators study the kinematics of grasping movements (prehension) under a variety of conditions to probe visuomotor function in normal and brain-damaged individuals. "Natural" prehensile acts are directed at the goal object and are executed using real-time vision. Typically, they also entail the use of tactile, proprioceptive, and kinesthetic sources of haptic feedback about the object ("haptics-based object information") once contact with the object has been made. Natural and simulated (pantomimed) forms of prehension are thought to recruit different cortical structures: patient DF, who has visual form agnosia following bilateral damage to her temporal-occipital cortex, loses her ability to scale her grasp aperture to the size of targets ("grip scaling") when her prehensile movements are based on a memory of a target previewed 2 s before the cue to respond or when her grasps are directed towards a visible virtual target but she is denied haptics-based information about the target. In the first of two experiments, we show that when DF performs real-time pantomimed grasps towards a 7.5 cm displaced imagined copy of a visible object such that her fingers make contact with the surface of the table, her grip scaling is in fact quite normal. This finding suggests that real-time vision and terminal tactile feedback are sufficient to preserve DF's grip scaling slopes. In the second experiment, we examined an "unnatural" grasping task variant in which a tangible target (along with any proxy such as the surface of the table) is denied (i.e., no terminal tactile feedback). To do this, we used a mirror-apparatus to present virtual targets with and without a spatially coincident copy for the participants to grasp. We compared the grasp kinematics from trials with and without terminal tactile feedback to a real-time-pantomimed grasping task (one without tactile feedback) in which participants visualized a copy of the visible target as instructed in our laboratory in the past. Compared to natural grasps, removing tactile feedback increased RT, slowed the velocity of the reach, reduced in-flight grip aperture, increased the slopes relating grip aperture to target width, and reduced the final grip aperture (FGA). All of these effects were also observed in the real time-pantomime grasping task. These effects seem to be independent of those that arise from using the mirror in general as we also compared grasps directed towards virtual targets to those directed at real ones viewed directly through a pane of glass. These comparisons showed that the grasps directed at virtual targets increased grip aperture, slowed the velocity of the reach, and reduced the slopes relating grip aperture to the widths of the target. Thus, using the mirror has real consequences on grasp kinematics, reflecting the importance of task-relevant sources of online visual information for the programming and updating of natural prehensile movements. Taken together, these results provide compelling support for the view that removing terminal tactile feedback, even when the grasps are target-directed, induces a switch from real-time visual control towards one that depends more on visual perception and cognitive supervision. Providing terminal tactile feedback and real-time visual information can evidently keep the dorsal visuomotor system operating normally for prehensile acts.
DOI: 10.3389/fnhum.2015.00216
PubMed: 25999834
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Real-time vision, tactile cues, and visual form agnosia: removing haptic feedback from a "natural" grasping task induces pantomime-like grasps.</title><author><name sortKey="Whitwell, Robert L" sort="Whitwell, Robert L" uniqKey="Whitwell R" first="Robert L" last="Whitwell">Robert L. Whitwell</name><affiliation><nlm:affiliation>Graduate Program in Neuroscience, The University of Western Ontario London, ON, Canada ; Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author><author><name sortKey="Ganel, Tzvi" sort="Ganel, Tzvi" uniqKey="Ganel T" first="Tzvi" last="Ganel">Tzvi Ganel</name><affiliation><nlm:affiliation>Department of Psychology, Ben-Gurion University of the Negev Beer-Sheva, Israel.</nlm:affiliation></affiliation></author><author><name sortKey="Byrne, Caitlin M" sort="Byrne, Caitlin M" uniqKey="Byrne C" first="Caitlin M" last="Byrne">Caitlin M. Byrne</name><affiliation><nlm:affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author><author><name sortKey="Goodale, Melvyn A" sort="Goodale, Melvyn A" uniqKey="Goodale M" first="Melvyn A" last="Goodale">Melvyn A. Goodale</name><affiliation><nlm:affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada ; Department of Physiology and Pharmacology, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2015">2015</date><idno type="doi">10.3389/fnhum.2015.00216</idno><idno type="RBID">pubmed:25999834</idno><idno type="pmid">25999834</idno><idno type="wicri:Area/PubMed/Corpus">000336</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Real-time vision, tactile cues, and visual form agnosia: removing haptic feedback from a "natural" grasping task induces pantomime-like grasps.</title><author><name sortKey="Whitwell, Robert L" sort="Whitwell, Robert L" uniqKey="Whitwell R" first="Robert L" last="Whitwell">Robert L. Whitwell</name><affiliation><nlm:affiliation>Graduate Program in Neuroscience, The University of Western Ontario London, ON, Canada ; Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author><author><name sortKey="Ganel, Tzvi" sort="Ganel, Tzvi" uniqKey="Ganel T" first="Tzvi" last="Ganel">Tzvi Ganel</name><affiliation><nlm:affiliation>Department of Psychology, Ben-Gurion University of the Negev Beer-Sheva, Israel.</nlm:affiliation></affiliation></author><author><name sortKey="Byrne, Caitlin M" sort="Byrne, Caitlin M" uniqKey="Byrne C" first="Caitlin M" last="Byrne">Caitlin M. Byrne</name><affiliation><nlm:affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author><author><name sortKey="Goodale, Melvyn A" sort="Goodale, Melvyn A" uniqKey="Goodale M" first="Melvyn A" last="Goodale">Melvyn A. Goodale</name><affiliation><nlm:affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada ; Department of Physiology and Pharmacology, The University of Western Ontario London, ON, Canada.</nlm:affiliation></affiliation></author></analytic><series><title level="j">Frontiers in human neuroscience</title><idno type="eISSN">1662-5161</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Investigators study the kinematics of grasping movements (prehension) under a variety of conditions to probe visuomotor function in normal and brain-damaged individuals. "Natural" prehensile acts are directed at the goal object and are executed using real-time vision. Typically, they also entail the use of tactile, proprioceptive, and kinesthetic sources of haptic feedback about the object ("haptics-based object information") once contact with the object has been made. Natural and simulated (pantomimed) forms of prehension are thought to recruit different cortical structures: patient DF, who has visual form agnosia following bilateral damage to her temporal-occipital cortex, loses her ability to scale her grasp aperture to the size of targets ("grip scaling") when her prehensile movements are based on a memory of a target previewed 2 s before the cue to respond or when her grasps are directed towards a visible virtual target but she is denied haptics-based information about the target. In the first of two experiments, we show that when DF performs real-time pantomimed grasps towards a 7.5 cm displaced imagined copy of a visible object such that her fingers make contact with the surface of the table, her grip scaling is in fact quite normal. This finding suggests that real-time vision and terminal tactile feedback are sufficient to preserve DF's grip scaling slopes. In the second experiment, we examined an "unnatural" grasping task variant in which a tangible target (along with any proxy such as the surface of the table) is denied (i.e., no terminal tactile feedback). To do this, we used a mirror-apparatus to present virtual targets with and without a spatially coincident copy for the participants to grasp. We compared the grasp kinematics from trials with and without terminal tactile feedback to a real-time-pantomimed grasping task (one without tactile feedback) in which participants visualized a copy of the visible target as instructed in our laboratory in the past. Compared to natural grasps, removing tactile feedback increased RT, slowed the velocity of the reach, reduced in-flight grip aperture, increased the slopes relating grip aperture to target width, and reduced the final grip aperture (FGA). All of these effects were also observed in the real time-pantomime grasping task. These effects seem to be independent of those that arise from using the mirror in general as we also compared grasps directed towards virtual targets to those directed at real ones viewed directly through a pane of glass. These comparisons showed that the grasps directed at virtual targets increased grip aperture, slowed the velocity of the reach, and reduced the slopes relating grip aperture to the widths of the target. Thus, using the mirror has real consequences on grasp kinematics, reflecting the importance of task-relevant sources of online visual information for the programming and updating of natural prehensile movements. Taken together, these results provide compelling support for the view that removing terminal tactile feedback, even when the grasps are target-directed, induces a switch from real-time visual control towards one that depends more on visual perception and cognitive supervision. Providing terminal tactile feedback and real-time visual information can evidently keep the dorsal visuomotor system operating normally for prehensile acts.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">25999834</PMID><DateCreated><Year>2015</Year><Month>05</Month><Day>22</Day></DateCreated><DateCompleted><Year>2015</Year><Month>05</Month><Day>22</Day></DateCompleted><DateRevised><Year>2015</Year><Month>05</Month><Day>24</Day></DateRevised><Article PubModel="Electronic-eCollection"><Journal><ISSN IssnType="Electronic">1662-5161</ISSN><JournalIssue CitedMedium="Print"><Volume>9</Volume><PubDate><Year>2015</Year></PubDate></JournalIssue><Title>Frontiers in human neuroscience</Title><ISOAbbreviation>Front Hum Neurosci</ISOAbbreviation></Journal><ArticleTitle>Real-time vision, tactile cues, and visual form agnosia: removing haptic feedback from a "natural" grasping task induces pantomime-like grasps.</ArticleTitle><Pagination><MedlinePgn>216</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.3389/fnhum.2015.00216</ELocationID><Abstract><AbstractText>Investigators study the kinematics of grasping movements (prehension) under a variety of conditions to probe visuomotor function in normal and brain-damaged individuals. "Natural" prehensile acts are directed at the goal object and are executed using real-time vision. Typically, they also entail the use of tactile, proprioceptive, and kinesthetic sources of haptic feedback about the object ("haptics-based object information") once contact with the object has been made. Natural and simulated (pantomimed) forms of prehension are thought to recruit different cortical structures: patient DF, who has visual form agnosia following bilateral damage to her temporal-occipital cortex, loses her ability to scale her grasp aperture to the size of targets ("grip scaling") when her prehensile movements are based on a memory of a target previewed 2 s before the cue to respond or when her grasps are directed towards a visible virtual target but she is denied haptics-based information about the target. In the first of two experiments, we show that when DF performs real-time pantomimed grasps towards a 7.5 cm displaced imagined copy of a visible object such that her fingers make contact with the surface of the table, her grip scaling is in fact quite normal. This finding suggests that real-time vision and terminal tactile feedback are sufficient to preserve DF's grip scaling slopes. In the second experiment, we examined an "unnatural" grasping task variant in which a tangible target (along with any proxy such as the surface of the table) is denied (i.e., no terminal tactile feedback). To do this, we used a mirror-apparatus to present virtual targets with and without a spatially coincident copy for the participants to grasp. We compared the grasp kinematics from trials with and without terminal tactile feedback to a real-time-pantomimed grasping task (one without tactile feedback) in which participants visualized a copy of the visible target as instructed in our laboratory in the past. Compared to natural grasps, removing tactile feedback increased RT, slowed the velocity of the reach, reduced in-flight grip aperture, increased the slopes relating grip aperture to target width, and reduced the final grip aperture (FGA). All of these effects were also observed in the real time-pantomime grasping task. These effects seem to be independent of those that arise from using the mirror in general as we also compared grasps directed towards virtual targets to those directed at real ones viewed directly through a pane of glass. These comparisons showed that the grasps directed at virtual targets increased grip aperture, slowed the velocity of the reach, and reduced the slopes relating grip aperture to the widths of the target. Thus, using the mirror has real consequences on grasp kinematics, reflecting the importance of task-relevant sources of online visual information for the programming and updating of natural prehensile movements. Taken together, these results provide compelling support for the view that removing terminal tactile feedback, even when the grasps are target-directed, induces a switch from real-time visual control towards one that depends more on visual perception and cognitive supervision. Providing terminal tactile feedback and real-time visual information can evidently keep the dorsal visuomotor system operating normally for prehensile acts.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Whitwell</LastName><ForeName>Robert L</ForeName><Initials>RL</Initials><AffiliationInfo><Affiliation>Graduate Program in Neuroscience, The University of Western Ontario London, ON, Canada ; Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Ganel</LastName><ForeName>Tzvi</ForeName><Initials>T</Initials><AffiliationInfo><Affiliation>Department of Psychology, Ben-Gurion University of the Negev Beer-Sheva, Israel.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Byrne</LastName><ForeName>Caitlin M</ForeName><Initials>CM</Initials><AffiliationInfo><Affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Goodale</LastName><ForeName>Melvyn A</ForeName><Initials>MA</Initials><AffiliationInfo><Affiliation>Department of Psychology, The University of Western Ontario London, ON, Canada ; The Brain and Mind Institute, The University of Western Ontario London, ON, Canada ; Department of Physiology and Pharmacology, The University of Western Ontario London, ON, Canada.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2015</Year><Month>05</Month><Day>06</Day></ArticleDate></Article><MedlineJournalInfo><Country>Switzerland</Country><MedlineTA>Front Hum Neurosci</MedlineTA><NlmUniqueID>101477954</NlmUniqueID><ISSNLinking>1662-5161</ISSNLinking></MedlineJournalInfo><OtherID Source="NLM">PMC4422037</OtherID><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">grasping</Keyword><Keyword MajorTopicYN="N">haptic feedback</Keyword><Keyword MajorTopicYN="N">pantomime grasps</Keyword><Keyword MajorTopicYN="N">visual feedback</Keyword><Keyword MajorTopicYN="N">visual form agnosia</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="ecollection"><Year>2015</Year><Month></Month><Day></Day></PubMedPubDate><PubMedPubDate PubStatus="received"><Year>2014</Year><Month>10</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2015</Year><Month>4</Month><Day>02</Day></PubMedPubDate><PubMedPubDate PubStatus="epublish"><Year>2015</Year><Month>5</Month><Day>06</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2015</Year><Month>5</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>5</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2015</Year><Month>5</Month><Day>23</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>epublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.3389/fnhum.2015.00216</ArticleId><ArticleId IdType="pubmed">25999834</ArticleId><ArticleId IdType="pmc">PMC4422037</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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