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The time course of visual processing: backward masking and natural scene categorisation



The time course of visual processing: backward masking and natural scene categorisation



Vision Research 45(11): 1459-1469



Human observers are very good at deciding whether briefly flashed novel images contain an animal and previous work has shown that the underlying visual processing can be performed in under 150 ms. Here we used a masking paradigm to determine how information accumulates over time during such high-level categorisation tasks. As the delay between test image and mask is increased, both behavioural accuracy and differential ERP amplitude rapidly increase to reach asymptotic levels around 40-60 ms. Such results imply that processing at each stage in the visual system is remarkably rapid, with information accumulating almost continuously following the onset of activation.

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Accession: 012684697

Download citation: RISBibTeXText

PMID: 15743615

DOI: 10.1016/j.visres.2005.01.004


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