Eye movements during natural actions in patients with schizophrenia

Delerue, Céline; Hayhoe, Mary; Boucart, Muriel

doi:10.1503/jpn.120143

Cited by 7 publications

(6 citation statements)

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“…In a study on eye movements during naturalistic action in schizophrenia, individuals with schizophrenia and healthy control participants completed a Bfamiliar^sandwich-making task and an Bunfamiliar^con-struction task (Delerue et al 2013). The schizophrenia group completed both tasks more slowly than healthy participants, but they performed more poorly only on the unfamiliar task.…”

Section: Naturalistic Eye Movements In Cognitive Impairmentmentioning

confidence: 99%

“…The schizophrenia group also made fewer look-ahead fixations only in the unfamiliar task, suggesting a failure to establish an efficient planning strategy like that employed by healthy individuals only in a novel context. Finally, schizophrenia participants had to reference the display model to complete the unfamiliar task more frequently than healthy controls, indicating difficulty constructing a mental representation and then holding that representation in mind while performing the task (Delerue et al 2013). With regards to everyday, naturalistic action, this study suggests that individuals with schizophrenia are slower but display similar visual behaviors to healthy individuals; it is only when task demands are increased by introducing a novel task for which the action plan is less familiar that susceptibility to feature salience, distractibility, inefficient planning, and working memory limitations appears to differentiate between impaired and healthy individuals.…”

Section: Naturalistic Eye Movements In Cognitive Impairmentmentioning

confidence: 99%

See 1 more Smart Citation

The Potential Utility of Eye Movements in the Detection and Characterization of Everyday Functional Difficulties in Mild Cognitive Impairment

Seligman

Giovannetti

2015

Neuropsychol Rev

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Mild cognitive impairment (MCI) refers to the intermediate period between the typical cognitive decline of normal aging and more severe decline associated with dementia, and it is associated with greater risk for progression to dementia. Research has suggested that functional abilities are compromised in MCI, but the degree of impairment and underlying mechanisms remain poorly understood. The development of sensitive measures to assess subtle functional decline poses a major challenge for characterizing functional limitations in MCI. Eye-tracking methodology has been used to describe visual processes in everyday, naturalistic action among healthy older adults as well as several case studies of severely impaired individuals, and it has successfully differentiated healthy older adults from those with MCI on specific visual tasks. These studies highlight the promise of eye-tracking technology as a method to characterize subtle functional decline in MCI. However, to date no studies have examined visual behaviors during completion of naturalistic tasks in MCI. This review describes the current understanding of functional ability in MCI, summarizes findings of eye-tracking studies in healthy individuals, severe impairment, and MCI, and presents future research directions to aid with early identification and prevention of functional decline in disorders of aging.

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Section: Naturalistic Eye Movements In Cognitive Impairmentmentioning

confidence: 99%

Section: Naturalistic Eye Movements In Cognitive Impairmentmentioning

confidence: 99%

The Potential Utility of Eye Movements in the Detection and Characterization of Everyday Functional Difficulties in Mild Cognitive Impairment

Seligman

Giovannetti

2015

Neuropsychol Rev

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“…Except one recently published study that found differences in scan-path patterns in unfamiliar environments between schizophrenia patients and healthy controls [ 10 ], previous work on eye-movement abnormalities in schizophrenia has been performed in laboratory settings. Recent studies in healthy participants have documented differences in eye-movement behavior measured in the laboratory as compared to real-life scenarios [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Eye movements of patients with schizophrenia in a natural environment

Dowiasch

Backasch

Einhäuser

et al. 2014

Eur Arch Psychiatry Clin Neurosci

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Alterations of eye movements in schizophrenia patients have been widely described for laboratory settings. For example, gain during smooth tracking is reduced, and fixation patterns differ between patients and healthy controls. The question remains, whether such results are related to the specifics of the experimental environment, or whether they transfer to natural settings. Twenty ICD-10 diagnosed schizophrenia patients and 20 healthy age-matched controls participated in the study, each performing four different oculomotor tasks corresponding to natural everyday behavior in an indoor environment: (I) fixating stationary targets, (II) sitting in a hallway with free gaze, (III) walking down the hallway, and (IV) visually tracking a target on the floor while walking straight-ahead. In all conditions, eye movements were continuously recorded binocularly by a mobile lightweight eye tracker (EyeSeeCam). When patients looked at predefined targets, they showed more fixations with reduced durations than controls. The opposite was true when participants were sitting in a hallway with free gaze. During visual tracking, patients showed a significantly greater root-mean-square error (representing the mean deviation from optimal) of retinal target velocity. Different from previous results on smooth-pursuit eye movements obtained in laboratory settings, no such difference was found for velocity gain. Taken together, we have identified significant differences in fundamental oculomotor parameters between schizophrenia patients and healthy controls during natural behavior in a real environment. Moreover, our data provide evidence that in natural settings, patients overcome some impairments, which might be present only in laboratory studies, by as of now unknown compensatory mechanisms or strategies.

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“…However, sev eral studies have reported that the restricted scanning found in individuals with schizophrenia on passive viewing tasks nor malized in active viewing conditions. [27][28][29] As participants were given a task in the present study, the more centre looking strat egy found in individuals with schizophrenia may better reflect a difference in multiple object tracking ability than a restricted scanning ability. Yet another possibility is that their centre looking strategy is a consequence of a decreased ability to de tect and/or to represent agents.…”

Section: Discussionmentioning

confidence: 84%