Response assignment influences visual recognition

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Psychology

Background:

• Immediate visual recognition tasks, like the same/different task, are crucial for understanding memory and decision-making.
• Previous research suggests distinct neural pathways may underlie different cognitive processes.

Purpose of the Study:

• To investigate if two different neural systems influence performance in a visual same/different recognition task.
• To determine how response key assignment affects task strategy and brain activation.

Main Methods:

• Participants performed a visual same/different task, responding to the presence of a target consonant in a study string.
• Response times (RT) were recorded, and functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• The 'same' and 'different' responses were assigned to the right response key in separate conditions.

Main Results:

• When 'same' response was on the right, no positional effect on RT was observed, suggesting no comparison with the study string.
• When 'different' response was on the right, RT showed a positional effect, indicating study string comparison.
• fMRI showed differential activation in the caudate and hippocampus based on the response key assignment.

Conclusions:

• Two distinct neural systems and computational processes are engaged depending on the response key assignment in a visual recognition task.
• The caudate and left hippocampus are implicated when the 'different' response is on the right.
• The right hippocampus is more active when the 'same' response is on the right, indicating distinct neural specializations.