Separable neural mechanisms support intentional forgetting and thought substitution.

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Intentional forgetting is achievable through direct suppression or thought substitution.
• Neural mechanisms underlying these distinct forgetting strategies remain largely uncompared.

Purpose of the Study:

• To directly compare the effectiveness and neural underpinnings of direct suppression (Forget cues) and thought substitution (Imagine cues) for intentional forgetting.
• To investigate if distinct neural processes support these two forgetting strategies.

Main Methods:

• Developed a novel item-method directed forgetting paradigm using Remember, Forget, and Imagine cues.
• Recorded electroencephalography (EEG) to analyze neural activity during the forgetting task.

Main Results:

• Both Forget and Imagine cues led to significant forgetting compared to Remember cues.
• Forget cues were associated with frontal oscillatory power changes predicting future forgetting.
• Imagine cues showed representational similarity predictive of later memory accuracy, suggesting contextual shifting.

Conclusions:

• Both direct suppression and thought substitution effectively induce intentional forgetting.
• Directed forgetting appears to involve frontally-mediated suppression.
• Thought substitution may rely on contextual shifting mechanisms that impair retrieval.