Attentional and sensory effects of lowered levels of intrinsic alertness

Matthias E, Bublak P, Costa A, Müller HJ, Schneider WX, Finke K (2009)
Neuropsychologia 47(14): 3255-3264.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
Low levels of intrinsic alertness are associated with lateralized performance in visual tasks, similar to neglect of the left (ipsilesional) visual hemi-field. However, it is unclear whether reduced alertness produces a specific lateralization of spatial-attentional processes in terms of the prioritization of right- over left-side stimuli, or whether it affects more basic functions of visuo-sensory coding, and/or higher function of the top-down control of selection, of stimuli on the left side. To decide between these alternatives, the present study examined the effects of lowered alertness, induced by a 50-min vigilance task, in a partial-report paradigm of briefly presented letter displays. With only one (unilateral) stimulus in display, no specific hemi-fleld effects were found under low-alertness conditions, indicating that reduced alertness impairs neither sensory effectiveness nor the top-town control of selection. However, with dual, bilateral stimuli, report accuracy was specifically affected for left-side targets (in subjects who showed comparable performance for both sides under normal-alertness conditions). This pattern can be interpreted in terms of a specific bias in spatial-attentional weighting, where prioritization of stimuli on the right leads to (mild) extinction of targets on the left. Moreover, participants who had a lower general level of alertness also showed a more pronounced re-distribution of weights, evidenced by a more severe imbalance in report accuracy, in a low compared to a normal state of alertness. This suggests that a low general level of intrinsic alertness engenders a specific vulnerability to neglect-like performance with a (mild) left-side extinction. (C) 2009 Elsevier Ltd. All rights reserved.
Erscheinungsjahr
Zeitschriftentitel
Neuropsychologia
Band
47
Zeitschriftennummer
14
Seite
3255-3264
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Matthias E, Bublak P, Costa A, Müller HJ, Schneider WX, Finke K. Attentional and sensory effects of lowered levels of intrinsic alertness. Neuropsychologia. 2009;47(14):3255-3264.
Matthias, E., Bublak, P., Costa, A., Müller, H. J., Schneider, W. X., & Finke, K. (2009). Attentional and sensory effects of lowered levels of intrinsic alertness. Neuropsychologia, 47(14), 3255-3264. doi:10.1016/j.neuropsychologia.2009.08.004
Matthias, E., Bublak, P., Costa, A., Müller, H. J., Schneider, W. X., and Finke, K. (2009). Attentional and sensory effects of lowered levels of intrinsic alertness. Neuropsychologia 47, 3255-3264.
Matthias, E., et al., 2009. Attentional and sensory effects of lowered levels of intrinsic alertness. Neuropsychologia, 47(14), p 3255-3264.
E. Matthias, et al., “Attentional and sensory effects of lowered levels of intrinsic alertness”, Neuropsychologia, vol. 47, 2009, pp. 3255-3264.
Matthias, E., Bublak, P., Costa, A., Müller, H.J., Schneider, W.X., Finke, K.: Attentional and sensory effects of lowered levels of intrinsic alertness. Neuropsychologia. 47, 3255-3264 (2009).
Matthias, Ellen, Bublak, Peter, Costa, Anna, Müller, Hermann J., Schneider, Werner X., and Finke, Kathrin. “Attentional and sensory effects of lowered levels of intrinsic alertness”. Neuropsychologia 47.14 (2009): 3255-3264.

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