A novel video-based paradigm to study the mechanisms underlying age- and falls risk- related differences in gaze behaviour during walking

This thesis aimed to investigate a novel way to explore changes in gaze behaviour, whilst walking, in frail populations. Initially three studies were conducted to establish how similar gaze behaviour recorded during walking was to that recorded whilst scene viewing. Duration of time and number of times different features were fixated were found to be similar in the three experiments. Older adults were assessed for falling risk and split into higher risk of falling (HROA) and lower risk of falling (LROA) groups. Their gaze behaviour was recorded whilst scene viewing along with a group of young adults. HROA were found to fixate the travel path longer than LROA and younger adults. HROA were slower at completing the incongruent Stroop task, suggesting a relationship between response inhibition and increased falling risk. A group of stroke patients were assessed for falling risk and split according to lesion location (parietal, occipital or frontal-temporal); gaze behaviour was recorded during scene viewing and compared to controls. Observable differences, which related to falling risk and lesion location, were shown in the gaze behaviour of the stroke patients compared to the controls. The findings of this thesis suggest that scene viewing could be used to better inform us about the changes in gaze behaviour which occur in frail populations that led to an increased risk of falling and the cognitive mechanisms which underlie these changes than laboratory studies.

A novel paradigm to identify age- and stroke-related changes to gaze behaviour associated with falls risk during walking

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In our laboratory we designed a cone-shaped, seamless and wide projection screen for psychophysical experiments in virtual reality (VR), in order to investigate the integration of head and eye movements in scene perception and navigation tasks. Our goal was to establish a low cost projection unit with a large field of view (FOV) in horizontal and vertical direction, where no edges would disturb the visual sensation. Here we present the engineering and computational considerations in order to establish such a setup in combination with psychophysical evaluations and some results from different implementations.

Gaze control and cognitive load in active vision - Task specific strategies in normal and visually impaired subjects

Eye Movements During a Locomotion Task in Virtual and Real Environments

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Eye Movements During a Locomotion Task in Virtual and Real Environments

Zugang zu Informationen in digitalen Sammlungen: Fokus Archive