Attentional load attenuates synaesthetic priming effects in grapheme-colour synaesthesia

Mattingley, JB, Payne, JM and Rich, AN (2006) Attentional load attenuates synaesthetic priming effects in grapheme-colour synaesthesia. Cortex, 42 2: 213-221. doi:10.1016/S0010-9452(08)70346-0


Author Mattingley, JB
Payne, JM
Rich, AN
Title Attentional load attenuates synaesthetic priming effects in grapheme-colour synaesthesia
Journal name Cortex   Check publisher's open access policy
ISSN 0010-9452
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1016/S0010-9452(08)70346-0
Volume 42
Issue 2
Start page 213
End page 221
Total pages 9
Place of publication Milano
Publisher Masson Divisione Periodici
Language eng
Abstract One of the hallmarks of grapheme-colour synaesthesia is that colours induced by letters, digits and words tend to interfere with the identification of coloured targets when the two colours are different, i.e., when they are incongruent. In a previous investigation (Mattingley et al., 2001) we found that this synaesthetic congruency effect occurs when an achromatic-letter prime precedes a coloured target, but that the effect disappears when the letter is pattern masked to prevent conscious recognition of its identity. Here we investigated whether selective attention modulates the synaesthetic congruency effect in a letter-priming task. Fourteen grapheme-colour synaesthetes and 14 matched, non-synaesthetic controls participated. The amount of selective attention available to process the letter-prime was limited by having participants perform a secondary visual task that involved discriminating pairs of gaps in adjacent limbs of a diamond surrounding the prime. In separate blocks of trials the attentional load of the secondary task was systematically varied to yield 'low load' and 'high load' conditions. We found a significant congruency effect for synaesthetes, but not for controls, when they performed a secondary attention-demanding task during presentation of the letter prime. Crucially, however, the magnitude of this priming was significantly reduced under conditions of high-load relative to low-load, indicating that attention plays an important role in modulating synaesthesia. Our findings help to explain the observation that synaesthetic colour experiences are often weak or absent during attention-demanding tasks.
Keyword Behavioral Sciences
Neurosciences
synaesthesia
selective attention
perceptual load
Stroop effect
priming
awareness
Visual-attention
Perceptual Load
Binding
Selection
Task
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Brain Institute Publications
 
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Created: Thu, 18 Oct 2007, 00:45:58 EST