Journal
FRONTIERS IN HUMAN NEUROSCIENCE
Volume 11, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fnhum.2017.00176
Keywords
phasic alertness; visual attention; computational modeling; event-related potentials; event-related lateralizations; arousal; warning cue
Categories
Funding
- Det Frie Forskningsrad (DFF, Danish Council for Independent Research) [1321-00039B]
- EU Marie Sklodowska-Curie COFUND Program, a DFF Sapere Aude Grant [11-104180]
- EU Marie Sklodowska-Curie COFUND Program, Initial Training Network of the European Union Seventh Framework Programme [606901]
- German Research Foundation (Deutsche Forschungsgemeinschaft) [FI 1424/2-1]
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In the present study, we investigated effects of phasic alerting on visual attention in a partial report task, in which half of the displays were preceded by an auditory warning cue. Based on the computational Theory of Visual Attention (TVA), we estimated parameters of spatial and non-spatial aspects of visual attention and measured event-related lateralizations (ERLs) over visual processing areas. We found that the TVA parameter sensory effectiveness a, which is thought to reflect visual processing capacity, significantly increased with phasic alerting. By contrast, the distribution of visual processing resources according to task relevance and spatial position, as quantified in parameters top-down control alpha and spatial bias w(index), was not modulated by phasic alerting. On the electrophysiological level, the latencies of ERLs in response to the task displays were reduced following the warning cue. These results suggest that phasic alerting facilitates visual processing in a general, unselective manner and that this effect originates in early stages of visual information processing.
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