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1.  Reducing and Restoring Stimulus-Response Compatibility Effects by Decreasing the Discriminability of Location Words 
Acta psychologica  2008;130(1):95-102.
In two experiments, we compared level of activation and temporal overlap accounts of compatibility effects in the Simon task by reducing the discriminability of spatial and non-spatial features of a target location word. Participants made keypress responses to the non-spatial or spatial feature of centrally-presented location words. The discriminability of the spatial feature of the word (Experiment 1), or of both the spatial and non-spatial feature (Experiment 2), was manipulated. When the spatial feature of the word was task-irrelevant, lowering the discriminability of this feature reduced the compatibility effect. The compatibility effect was restored when the discriminability of both the task-relevant and task-irrelevant features were reduced together. Results provide further evidence for the temporal overlap account of compatibility effects. Furthermore, compatibility effects when the spatial information was task-relevant and those when the spatial information was task-irrelevant were moderately correlated with each other, suggesting a common underlying mechanism in both versions.
doi:10.1016/j.actpsy.2008.10.005
PMCID: PMC2677062  PMID: 19041085
Simon effect; stimulus-response compatibility; temporal overlap; automatic activation
2.  Age Differences in Response Selection for Pure and Mixed Stimulus-Response Mappings and Tasks 
Acta psychologica  2008;129(1):49-60.
Two experiments examined effects of mixed stimulus-response mappings and tasks for older and younger adults. In Experiment 1, participants performed two-choice spatial reaction tasks with blocks of pure and mixed compatible and incompatible mappings. In Experiment 2, a compatible or incompatible mapping was mixed with a Simon task for which the mapping of stimulus color to location was relevant and stimulus location irrelevant. In both experiments older adults showed larger mixing costs than younger adults and larger compatibility effects, with the differences particularly pronounced in Experiment 1 when location mappings were mixed. In mixed conditions, when stimulus location was relevant, older adults benefited more than younger adults from complete repetition of the task and stimulus from the preceding trial. When stimulus location was irrelevant, the benefit of complete repetition did not differ reliably between age groups. The results suggest that the age-related deficit associated with mixing mappings and tasks is primarily due to older adults having more difficulty separating task sets that activate conflicting response codes.
doi:10.1016/j.actpsy.2008.04.006
PMCID: PMC2608201  PMID: 18541219
Aging; Attention; Response Selection; 2860 Gerontology; 2346 Attention

Results 1-2 (2)