Patient DF's visual brain in action: Visual feedforward control in visual form agnosia
Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width...
Ausführliche Beschreibung
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| Autor*in: |
Whitwell, Robert L [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Rechteinformationen: |
Nutzungsrecht: Copyright © 2014 Elsevier B.V. All rights reserved. |
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| Systematik: |
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| Übergeordnetes Werk: |
Enthalten in: Vision research - Exeter : Elsevier Science, 1961, 110(2015), Pt B, Seite 265 |
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| Übergeordnetes Werk: |
volume:110 ; year:2015 ; number:Pt B ; pages:265 |
| Links: |
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| 520 | |a Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. | ||
| 540 | |a Nutzungsrecht: Copyright © 2014 Elsevier B.V. All rights reserved. | ||
| 700 | 1 | |a Milner, A David |4 oth | |
| 700 | 1 | |a Cavina-Pratesi, Cristiana |4 oth | |
| 700 | 1 | |a Barat, Masihullah |4 oth | |
| 700 | 1 | |a Goodale, Melvyn A |4 oth | |
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PQ20160617 (DE-627)OLC1963279891 (DE-599)GBVOLC1963279891 (PRQ)p833-8762398b107163ef2b16d3124cbe67449e91cc1e8e8769800f073fc4496714390 (KEY)0015219620150000110000000265patientdfsvisualbraininactionvisualfeedforwardcont DE-627 ger DE-627 rakwb eng 570 610 DNB CP 2500: AVZ rvk WA 15000 AVZ rvk WW 1780: AVZ rvk 44.37 bkl 44.95 bkl Whitwell, Robert L verfasserin aut Patient DF's visual brain in action: Visual feedforward control in visual form agnosia 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. Nutzungsrecht: Copyright © 2014 Elsevier B.V. All rights reserved. Milner, A David oth Cavina-Pratesi, Cristiana oth Barat, Masihullah oth Goodale, Melvyn A oth Enthalten in Vision research Exeter : Elsevier Science, 1961 110(2015), Pt B, Seite 265 (DE-627)12945981X (DE-600)200427-6 (DE-576)014823675 0042-6989 nnns volume:110 year:2015 number:Pt B pages:265 http://www.ncbi.nlm.nih.gov/pubmed/25199609 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_20 GBV_ILN_21 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 CP 2500: WA 15000 WW 1780: 44.37 AVZ 44.95 AVZ AR 110 2015 Pt B 265 |
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PQ20160617 (DE-627)OLC1963279891 (DE-599)GBVOLC1963279891 (PRQ)p833-8762398b107163ef2b16d3124cbe67449e91cc1e8e8769800f073fc4496714390 (KEY)0015219620150000110000000265patientdfsvisualbraininactionvisualfeedforwardcont DE-627 ger DE-627 rakwb eng 570 610 DNB CP 2500: AVZ rvk WA 15000 AVZ rvk WW 1780: AVZ rvk 44.37 bkl 44.95 bkl Whitwell, Robert L verfasserin aut Patient DF's visual brain in action: Visual feedforward control in visual form agnosia 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. Nutzungsrecht: Copyright © 2014 Elsevier B.V. All rights reserved. Milner, A David oth Cavina-Pratesi, Cristiana oth Barat, Masihullah oth Goodale, Melvyn A oth Enthalten in Vision research Exeter : Elsevier Science, 1961 110(2015), Pt B, Seite 265 (DE-627)12945981X (DE-600)200427-6 (DE-576)014823675 0042-6989 nnns volume:110 year:2015 number:Pt B pages:265 http://www.ncbi.nlm.nih.gov/pubmed/25199609 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_20 GBV_ILN_21 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 CP 2500: WA 15000 WW 1780: 44.37 AVZ 44.95 AVZ AR 110 2015 Pt B 265 |
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Whitwell, Robert L @@aut@@ Milner, A David @@oth@@ Cavina-Pratesi, Cristiana @@oth@@ Barat, Masihullah @@oth@@ Goodale, Melvyn A @@oth@@ |
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Patient DF's visual brain in action: Visual feedforward control in visual form agnosia |
| abstract |
Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. |
| abstractGer |
Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. |
| abstract_unstemmed |
Patient DF, who developed visual form agnosia following ventral-stream damage, is unable to discriminate the width of objects, performing at chance, for example, when asked to open her thumb and forefinger a matching amount. Remarkably, however, DF adjusts her hand aperture to accommodate the width of objects when reaching out to pick them up (grip scaling). While this spared ability to grasp objects is presumed to be mediated by visuomotor modules in her relatively intact dorsal stream, it is possible that it may rely abnormally on online visual or haptic feedback. We report here that DF's grip scaling remained intact when her vision was completely suppressed during grasp movements, and it still dissociated sharply from her poor perceptual estimates of target size. We then tested whether providing trial-by-trial haptic feedback after making such perceptual estimates might improve DF's performance, but found that they remained significantly impaired. In a final experiment, we re-examined whether DF's grip scaling depends on receiving veridical haptic feedback during grasping. In one condition, the haptic feedback was identical to the visual targets. In a second condition, the haptic feedback was of a constant intermediate width while the visual target varied trial by trial. Despite this incongruent feedback, DF still scaled her grip aperture to the visual widths of the target blocks, showing only normal adaptation to the false haptically-experienced width. Taken together, these results strengthen the view that DF's spared grasping relies on a normal mode of dorsal-stream functioning, based chiefly on visual feedforward processing. |
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