Neural Distinction between Visual Word and Object Recognition: An fMRI Study Using Pictographs.

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Distinguishing neural mechanisms for word vs. object recognition is challenging due to confounding factors.
• Previous studies struggled to control for stimulus properties and task demands simultaneously.

Purpose of the Study:

• To investigate intrinsic neural differences between word and object recognition.
• To identify the specific brain regions and networks involved in these distinct processes.

Main Methods:

• Used Chinese pictographs as stimuli, interpretable as both words and objects.
• Employed functional magnetic resonance imaging (fMRI) with rigorously matched stimuli and tasks.
• Participants performed realness, sound, and meaning judgment tasks on pictographs recognized as words or objects.

Main Results:

• Identified significant word-object differences in the inferior parietal lobule (IPL) and anterior cingulate cortex (ACC).
• Word recognition showed stronger IPL activation and reduced ACC deactivation compared to object recognition.
• Distinct multivoxel patterns and enhanced functional connectivity were observed in these regions during word recognition.

Conclusions:

• Provided well-controlled evidence for intrinsic neural dissociations between word and object recognition.
• Highlighted a parietal-cingulate network as a core substrate differentiating these cognitive processes.