S-R compatibility effects due to context-dependent spatial stimulus coding.

Area of Science:

• Cognitive Psychology
• Human Factors
• Neuroscience

Background:

• Spatial stimulus-response (S-R) correspondence enhances response speed (spatial compatibility effect).
• The Simon effect demonstrates faster responses when stimulus and response locations correspond, even if irrelevant.
• The role of visual context in spatial coding and its influence on response selection remains an area of investigation.

Purpose of the Study:

• To investigate if visual context can induce left-right coding for stimuli presented above and below a fixation point.
• To determine if this induced coding affects response selection, similar to the Simon effect.
• To examine the automaticity of object-based spatial coding.

Main Methods:

• Two experiments were conducted using a visual display with stimuli presented on a face image.
• Stimuli appeared on the left or right eye of a face tilted by 90° (Experiment 1) or varying in tilt (Experiment 2).
• Response times were measured under conditions of relevant and irrelevant stimulus location information.

Main Results:

• Responses were significantly faster when the face-based stimulus location corresponded with the egocentric response location.
• This effect persisted regardless of whether stimulus location was relevant or irrelevant to the task.
• Faster responses were observed even when stimulus and response locations varied on physically orthogonal dimensions.

Conclusions:

• Object-based spatial stimulus codes are formed automatically, influencing response selection speed.
• Visual context can automatically induce spatial coding, impacting performance on S-R tasks.
• These findings contribute to understanding the automatic mechanisms underlying spatial attention and response selection.