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Do synaesthetic colours act as unique features in visual search?
Jessica Edquist1, Anina N Rich, Cobie Brinkman
1School of Psychology, Australian National University, Australia.
Summary
Grapheme-colour synaesthesia does not automatically guide visual search. Synaesthetic colours emerge after focused attention, not during early visual processing, suggesting inducers require attention to activate colours.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Grapheme-colour synaesthesia involves consistent colour experiences for letters/numbers.
- A key question is whether synaesthetic colours arise early or late in visual processing.
Purpose of the Study:
- To investigate the timing of synaesthetic colour perception in visual search.
- To determine if synaesthetic colours guide attention or arise post-recognition.
Main Methods:
- 14 grapheme-colour synaesthetes and 14 controls performed visual search tasks.
- Participants searched for a target digit among distractors in chromatic and achromatic conditions.
- Search efficiency was measured based on display size and target/distractor properties.
Main Results:
- Both groups showed efficient search when targets were defined by unique display colours.
- Search was inefficient for both groups when targets were achromatic but elicited distinct synaesthetic colours.
- Synaesthetic colours did not facilitate visual search in the achromatic condition.
Conclusions:
- Synaesthetic colours do not appear to arise early enough in visual processing to guide focal attention.
- Findings support the hypothesis that graphemic inducers require selective attention to elicit synaesthetic colours.
- This suggests a later stage of processing for synaesthetic colour generation.