Visual field differences in semantic comparative judgments with digits and Kanji stimulus materials.

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Neuroscience

Background:

• Hemisphere specialization is crucial for cognitive functions.
• Semantic comparative judgments involve processing relationships between concepts.
• Previous research suggests distinct neural pathways for different types of information processing.

Purpose of the Study:

• To investigate hemisphere specialization for two distinct types of semantic comparative judgments.
• To differentiate between judgments relying on verbal codes versus those using imagery.
• To explore the role of the left and right hemispheres in these cognitive processes.

Main Methods:

• Experiment 1: Arabic numerals presented, judging congruence between physical size and numerical magnitude.
• Experiment 2: Kanji representing objects presented, judging congruence between physical size and real-world object size.
• Experiment 3: Kanji representing numerical magnitude presented, judging congruence between physical size and numerical magnitude.

Main Results:

• Faster reaction times in the right visual field for Arabic numeral judgments (Experiment 1).
• Faster reaction times in the left visual field for Kanji object judgments (Experiment 2).
• Right visual field advantage observed for Kanji numerical magnitude judgments (Experiment 3), ruling out Kanji complexity.

Conclusions:

• Two types of semantic comparative judgments exist: verbal code-based and imagery-based.
• Verbal code judgments engage the left hemisphere more strongly.
• Imagery-based judgments require greater right hemisphere contribution.