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• W2101688506 startingPage "810" @default.
• W2101688506 abstract "Fixation to a target in primary gaze is invariably interrupted by physiological conjugate saccadic intrusions (SI). These small idiosyncratic eye movements (usually <1° in amplitude) take the form of an initial horizontal fast eye movement away from the desired eye position, followed after a variable duration by a return saccade or drift. As the aetiology of SI is still unclear, it was the aim of this study to investigate whether SI are related to exogenous or endogenous attentional processes. This was achieved by varying (a) the “bottom-up” target viewing conditions (target presence, servo control of the target, target background, target size) and (b) the ‘top-down’ attentional state (instruction change—‘look’ or ‘hold eyes steady’ and passive fixation versus active—‘respond to change’ fixation) in 13 subjects (the number of participants in each task varied between 7 and 11). We also manipulated the orientation of pure exogenous attention through a cue-target task, during which subjects were required to respond to a target, preceded by a non-informative cue by either pressing a button or making a saccade towards the target. SI amplitude, duration, frequency and direction were measured. SI amplitude was found to be significantly higher when the target was absent and SI frequency significantly lower during open loop conditions. Target size and background influenced SI behaviour in an idiosyncratic manner, although there was a trend for subjects to exhibit lower SI frequencies and amplitudes when a patterned background was present and larger SI amplitudes with larger target sizes. SI frequency decreased during the “hold eyes steady” passive command as well as during active fixation but SI direction was not influenced by the exogenous cue-target task. These results suggest that SI are related to endogenous rather than exogenous attention mechanisms. Our experiments lead us to propose that SI represent shifts in endogenous attention that reflect a baseline attention state present during laboratory fixation tasks and may prove to be a useful tool to explore higher cortical control of fixation." @default.
• W2101688506 created "2016-06-24" @default.
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• W2101688506 date "2005-12-01" @default.
• W2101688506 modified "2023-10-17" @default.
• W2101688506 title "Paying attention to saccadic intrusions" @default.
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• W2101688506 doi "https://doi.org/10.1016/j.cogbrainres.2005.09.002" @default.
• W2101688506 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16256318" @default.
• W2101688506 hasPublicationYear "2005" @default.
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