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The influence of target discriminability on the time course of attentional selection

By Srivas Chennu, Patrick Craston, Brad Wyble and Howard Bowman

Abstract

A wealth of neurophysiological data has demonstrated that visual attention can selectively enhance target representations early in the visual processing pathway. In conjunction, behavioural evidence tells us that the extent to which irrelevant items interfere with target processing depends on their featural similarity to the target. In this context, how does target discriminability influence temporal selection? We present results from an electrophysiology study that addresses this question by investigating the time course of the neural processes involved in target selection as target distinctiveness is varied. The results suggest that, in line with previous findings, making discrimination harder reduces the accuracy of target identification. We find that there are significant differences in the perceptual processing of the target in the two conditions, as indexed by early visual ERPs and the P3 ERP. We ground this and previous empirical evidence within a theoretical framework for understanding the mechanism of attentional selection represented in the ST2 model, a neural network model of temporal attention and working memory. By simulating both experimental conditions, we show that the model provides a convincing explanation of the pattern of experimental results, in addition to informing questions about the nature and time course of attentional selection

Topics: QA76
Year: 2009
OAI identifier: oai:kar.kent.ac.uk:24083

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  1. (1995). A Two-Stage Model for Multiple Target Detection in Rapid Serial Visual Presentation. doi
  2. (2009). Applying cognitive electrophysiology to neural modelling of the attentional blink. Unpublished doctoral dissertation,
  3. (2009). Applying cognitive electrophysiology to neuralmodellingoftheattentionalblink. Unpublisheddoctoral dissertation,
  4. (1999). Competitive Mechanisms Subserve Attention
  5. (1994). Direct measurement of attentional dwell time in human vision. doi
  6. (2004). EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics including independent component analysis. doi
  7. (2004). EEGLAB:anopensource toolbox for analysis of single-trial EEG dynamics including independent component analysis. doi
  8. (1997). Effects of similarity, dif´Čüculty, and nontarget presentation on the time course of visual attention. doi
  9. (1998). Electrophysiological Evidence for a Postperceptual Locus of Suppression During the Attentional Blink. doi
  10. (1990). Electrophysiological evidence for parallel and serial processing during visual search. doi
  11. (1998). Event-related brain potentials in the study of visual selectiveattention. doi
  12. (2004). Rapid serial visual distraction: Task-irrelevant items can produce an attentional blink. doi
  13. (2003). Steady-state VEP and attentional visual processing. In doi
  14. (2005). Target consolidation under high temporal processing demands as revealed by MEG. doi
  15. (1992). Temporary Suppression of Visual Processing in an RSVP Task: An Attentional Blink? doi
  16. (2009). The attentional blink reveals serial working memory encoding: Evidence from virtual & human event-related potentials. doi
  17. (1997). The Psychophysics Toolbox. doi
  18. (2007). The Simultaneous Type, Serial Token Model of Temporal Attention and Working Memory. doi
  19. (1997). Types and Tokens in Visual Processing: A Double Dissociation Between the Attentional Blink and Repetition Blindness. doi

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