Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment
Aim of this study is to explore behavioral responses and eye movements of unilateral neglect patients in a virtual bisection task. Space to be bisected was included between two endpoint, segment length together with segment spatial dislocation were varied in order to test the presence of a “gradient...
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| Format: | Article |
| Language: | English |
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LED Edizioni Universitarie
2013-04-01
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| Series: | Neuropsychological Trends |
| Subjects: | |
| Online Access: | http://www.ledonline.it/NeuropsychologicalTrends/allegati/NeuropsychologicalTrends_13_Sozzi.pdf |
| _version_ | 1828359643085144064 |
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| author | Matteo Sozzi Michela Balconi Luigi Pisani Claudio Mariani |
| author_facet | Matteo Sozzi Michela Balconi Luigi Pisani Claudio Mariani |
| author_sort | Matteo Sozzi |
| collection | DOAJ |
| description | Aim of this study is to explore behavioral responses and eye movements of unilateral neglect patients in a virtual bisection task. Space to be bisected was included between two endpoint, segment length together with segment spatial dislocation were varied in order to test the presence of a “gradient effect” in both bisection behavior and visual exploration. Ten right neglect patients took part to the study, all data were then matched with those obtained from ten healthy participants. Behavioral measures (bisection and RTs) and eye-movements (fixation count and duration; first fixation count) were analyzed. Consistent spatial biases were found for bisection responses, RTs, fixation count and duration, as well as for the first fixation count. We then find a significant rightward bias in patients, i.e. increasing rightside bisection and rightward fixations when the stimuli were in the extreme left-position. Concerning merely segment length, we observed significant differences between-groups only for eye movement behavior, with increased rightward fixation count and duration in response to longer segments. In conclusion, “left-to-right” and “longer-to-shorter” continuous-gradient effects were not totally supported by our results, whereas an “extreme-left” gradient effect was suggested and discussed. |
| first_indexed | 2024-04-14T03:44:13Z |
| format | Article |
| id | doaj.art-70b4601a7ac34818874a64d78c27a7df |
| institution | Directory Open Access Journal |
| issn | 1970-321X 1970-3201 |
| language | English |
| last_indexed | 2024-04-14T03:44:13Z |
| publishDate | 2013-04-01 |
| publisher | LED Edizioni Universitarie |
| record_format | Article |
| series | Neuropsychological Trends |
| spelling | doaj.art-70b4601a7ac34818874a64d78c27a7df2022-12-22T02:14:22ZengLED Edizioni UniversitarieNeuropsychological Trends1970-321X1970-32012013-04-0113598110.7358/neur-2013-013-sozzBisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatmentMatteo Sozzi0Michela Balconi1Luigi Pisani2Claudio Mariani3Department of Neuro-Rehabilitative Sciences, Casa di Cura Privata del Policlinico, Milan, ItalyResearch Unit in Neuropsychology of Language; Department of Psychology, Catholic University of Sacred Heart of Milan, ItalyDepartment of Neuro-Rehabilitative Sciences, Casa di Cura Privata del Policlinico, Milan, ItalyUnit of Neurology, Hospital L. Sacco, University of Milan, ItalyAim of this study is to explore behavioral responses and eye movements of unilateral neglect patients in a virtual bisection task. Space to be bisected was included between two endpoint, segment length together with segment spatial dislocation were varied in order to test the presence of a “gradient effect” in both bisection behavior and visual exploration. Ten right neglect patients took part to the study, all data were then matched with those obtained from ten healthy participants. Behavioral measures (bisection and RTs) and eye-movements (fixation count and duration; first fixation count) were analyzed. Consistent spatial biases were found for bisection responses, RTs, fixation count and duration, as well as for the first fixation count. We then find a significant rightward bias in patients, i.e. increasing rightside bisection and rightward fixations when the stimuli were in the extreme left-position. Concerning merely segment length, we observed significant differences between-groups only for eye movement behavior, with increased rightward fixation count and duration in response to longer segments. In conclusion, “left-to-right” and “longer-to-shorter” continuous-gradient effects were not totally supported by our results, whereas an “extreme-left” gradient effect was suggested and discussed.http://www.ledonline.it/NeuropsychologicalTrends/allegati/NeuropsychologicalTrends_13_Sozzi.pdfSpatial neglectBisection taskVisual searchEye movement measuresSpatial gradient |
| spellingShingle | Matteo Sozzi Michela Balconi Luigi Pisani Claudio Mariani Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment Neuropsychological Trends Spatial neglect Bisection task Visual search Eye movement measures Spatial gradient |
| title | Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment |
| title_full | Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment |
| title_fullStr | Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment |
| title_full_unstemmed | Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment |
| title_short | Bisection and visual exploration strategy in hemineglect: eye-movement measures for rehabilitation treatment |
| title_sort | bisection and visual exploration strategy in hemineglect eye movement measures for rehabilitation treatment |
| topic | Spatial neglect Bisection task Visual search Eye movement measures Spatial gradient |
| url | http://www.ledonline.it/NeuropsychologicalTrends/allegati/NeuropsychologicalTrends_13_Sozzi.pdf |
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