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Simon effect with and without awareness of the accessory stimulus
Barbara Treccani1, Carlo Umiltà, Mariaelena Tagliabue
1Dipartimento di Psicologia Generale, Università di Padova, Padua, Italy.
Summary
Researchers explored the Simon effect with unaware participants. A regular Simon effect occurred with visible cues, but a reverse effect emerged when cues were hidden, suggesting attention reorientation plays a key role.
Area of Science:
- Cognitive Psychology
- Human Attention Studies
Background:
- The Simon effect, a well-documented phenomenon in cognitive psychology, typically demonstrates faster reaction times (RTs) when a stimulus's spatial location corresponds to the required response location.
- Investigating the Simon effect in accessory-stimulus tasks, especially when participants are unaware of task-irrelevant cues, offers insights into implicit processing and attentional mechanisms.
Purpose of the Study:
- To determine if a Simon effect is observable in an accessory-stimulus Simon task when participants lack awareness of the task-irrelevant accessory cue.
- To elucidate the role of attentional reorientation in modulating the Simon effect under conditions of cue unawareness.
Main Methods:
- Participants performed a Simon task with a central visual target and a lateral visual accessory cue.
- Experiments manipulated cue visibility (suprathreshold vs. subthreshold) and stimulus onset asynchrony (SOA) to examine the Simon effect.
- Attentional reorientation was experimentally induced by varying target-cue presentation timing.
Main Results:
- A regular Simon effect was observed when the accessory cue was suprathreshold and participants were aware of it.
- A reverse Simon effect emerged when participants were unaware of the suprathreshold cue, suggesting attention was initially captured and then reoriented.
- The type of Simon effect (regular or reverse) depended on cue visibility and stimulus onset asynchrony, with subthreshold cues consistently yielding a reverse Simon effect.
Conclusions:
- Cue awareness is critical in determining the direction of the Simon effect in accessory-stimulus tasks.
- The findings support the role of attentional capture and reorientation in modulating the Simon effect, particularly when task-irrelevant cues are not consciously perceived.
- The study highlights the complex interplay between stimulus properties, attentional dynamics, and response selection in spatial cognition.
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