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Thinking while talking: adults fail nonverbal false-belief reasoning.

Ashley M Newton¹, Jill G de Villiers

¹Smith College, Northampton, MA 01063, USA.

Psychological Science

|July 7, 2007

Summary

Language processing significantly impairs nonverbal false-belief reasoning in adults. Concurrent verbal tasks disrupted theory of mind, while rhythmic tapping did not, highlighting language

Area of Science:

Cognitive Psychology
Neuroscience
Linguistics

Background:

Theory of Mind (ToM) enables understanding others' mental states.
Investigating cognitive load's impact on ToM is crucial for understanding its mechanisms.

Purpose of the Study:

To determine if concurrent verbal or motor tasks interfere with nonverbal false-belief reasoning in adults.
To elucidate the role of language in supporting working Theory of Mind.

Main Methods:

81 adult participants completed a nonverbal false-belief task.
Concurrent conditions included shadowing spoken dialogue or rhythmic tapping.
Performance was compared across conditions.

Main Results:

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Shadowing spoken dialogue significantly impaired false-belief reasoning performance.

Rhythmic tapping did not significantly affect false-belief reasoning.

Language processing appears critical for nonverbal ToM in adults.

Conclusions:

Language engagement disrupts nonverbal Theory of Mind.
Working memory for Theory of Mind relies heavily on language processing.
Nonverbal reasoning tasks are sensitive to verbal interference.