Eye Gaze Behavior at Turn Transition: How Aphasic Patients Process Speakers' Turns during Video Observation

Preisig, Basil; Eggenberger, Noëmi; Zito, Giuseppe Angelo; Vanbellingen, Tim; Schumacher, Rahel; Hopfner, Simone; Gutbrod, Klemens; Nyffeler, Thomas; Cazzoli, Dario; Annoni, Jean-Marie; Bohlhalter, Stephan; Müri, René Martin (2016). Eye Gaze Behavior at Turn Transition: How Aphasic Patients Process Speakers' Turns during Video Observation. Journal of cognitive neuroscience, 28(10), pp. 1-12. MIT Press Journals 10.1162/jocn_a_00983

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The human turn-taking system regulates the smooth and precise exchange of speaking turns during face-to-face interaction. Recent studies investigated the processing of ongoing turns during conversation by measuring the eye movements of noninvolved observers. The findings suggest that humans shift their gaze in anticipation to the next speaker before the start of the next turn. Moreover, there is evidence that the ability to timely detect turn transitions mainly relies on the lexico-syntactic content provided by the conversation. Consequently, patients with aphasia, who often experience deficits in both semantic and syntactic processing, might encounter difficulties to detect and timely shift their gaze at turn transitions. To test this assumption, we presented video vignettes of natural conversations to aphasic patients and healthy controls, while their eye movements were measured. The frequency and latency of event-related gaze shifts, with respect to the end of the current turn in the videos, were compared between the two groups. Our results suggest that, compared with healthy controls, aphasic patients have a reduced probability to shift their gaze at turn transitions but do not show significantly increased gaze shift latencies. In healthy controls, but not in aphasic patients, the probability to shift the gaze at turn transition was increased when the video content of the current turn had a higher lexico-syntactic complexity. Furthermore, the results from voxel-based lesion symptom mapping indicate that the association between lexico-syntactic complexity and gaze shift latency in aphasic patients is predicted by brain lesions located in the posterior branch of the left arcuate fasciculus. Higher lexico-syntactic processing demands seem to lead to a reduced gaze shift probability in aphasic patients. This finding may represent missed opportunities for patients to place their contributions during everyday conversation.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology
04 Faculty of Medicine > University Psychiatric Services > University Hospital of Geriatric Psychiatry and Psychotherapy
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DCR Unit Sahli Building > Forschungsgruppe Neurologie
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Gerontechnology and Rehabilitation

Graduate School:

Graduate School for Health Sciences (GHS)

UniBE Contributor:

Preisig, Basil; Eggenberger, Noëmi; Zito, Giuseppe Angelo; Vanbellingen, Tim; Schumacher, Rahel; Hopfner, Simone; Gutbrod, Klemens; Nyffeler, Thomas; Cazzoli, Dario; Bohlhalter, Stephan and Müri, René Martin

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

0898-929X

Publisher:

MIT Press Journals

Language:

English

Submitter:

Stefanie Hetzenecker

Date Deposited:

18 Jul 2016 09:48

Last Modified:

25 Jan 2017 11:38

Publisher DOI:

10.1162/jocn_a_00983

PubMed ID:

27243612

BORIS DOI:

10.7892/boris.84387

URI:

https://boris.unibe.ch/id/eprint/84387

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