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A central-peripheral asymmetry in masked priming
1Department of Experimental Psychology, Birkbeck College, Malet Street, London WC1E, 7HX, England. f.schlaghecken@bbk.ac.uk
Perception & Psychophysics
|January 6, 2001
Summary
Behavioral benefits from masked primes depend on their location. Central primes benefit incompatible trials at longer durations, while peripheral primes benefit compatible trials, suggesting retinal physiology influences processing.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Masked primes can influence target processing, creating behavioral benefits.
- A central-peripheral asymmetry (CPA) in prime effects has been observed.
- Understanding the mechanisms of CPA is crucial for visual processing models.
Purpose of the Study:
- To investigate the temporal dynamics of the central-peripheral asymmetry (CPA).
- To determine if CPA effects persist with physically dissimilar primes and targets.
- To explore the roles of visual-spatial attention and retinal eccentricity in CPA.
Main Methods:
- Experiment 1 examined the time course of CPA using varying stimulus onset asynchronies (SOAs).
- Experiment 2 used physically dissimilar primes and targets to test perceptual influences.
- Experiments 3 and 4 manipulated attentional load and retinal location.
Main Results:
- Central primes shifted from compatible to incompatible trial benefits with increasing SOAs.
- Peripheral primes showed increasing compatible trial benefits with longer SOAs.
- CPA was independent of attention but strongly linked to retinal inhomogeneity.
Conclusions:
- The central-peripheral asymmetry (CPA) is primarily driven by retinal physiological factors, not attention.
- An activation threshold model explains how retinal sensitivity modulates prime effects.
- These findings offer insights into the neural basis of visual attention and response selection.