Investigating Prospective Memory Processes: ERP Evidence from Novel Semantic Judgment Tasks

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Prospective memory (PM) is crucial for daily functioning, involving future intention planning and execution.
• Understanding the neural basis of PM retrieval, especially with visual cues, remains incomplete.
• Existing research often lacks tasks that specifically isolate PM processes like intention formation, retention, and retrieval.

Purpose of the Study:

• To develop and validate two novel picture-based semantic-judgment prospective memory tasks: the Animal-cued Prospective Retrieval Task (Ac-PRT) and the Object-cued Prospective Retrieval Task (Oc-PRT).
• To investigate the behavioral and neural mechanisms underlying intention formation, retention, and retrieval within these tasks.
• To examine category-specific differences in cognitive and neural processes between the Ac-PRT and Oc-PRT.

Main Methods:

• Twenty-three young adults (18-30 years) performed the Ac-PRT and Oc-PRT while electroencephalography (EEG) was recorded.
• Tasks included Cue trials (intention formation), Ongoing trials (intention retention), and PM Retrieval trials (intention retrieval).
• Behavioral data (response time, accuracy) and event-related potentials (ERPs) were analyzed.

Main Results:

• Participants were slower in Ongoing trials and less accurate in PM Retrieval trials.
• The Ac-PRT yielded faster and more accurate responses than the Oc-PRT during Ongoing and PM Retrieval trials.
• Distinct ERP components (P2, N2, N4, Parietal Positivity) showed differential activity across trial types and tasks, indicating unique neural signatures for PM processes.

Conclusions:

• The developed Ac-PRT and Oc-PRT effectively differentiate core prospective memory processes.
• Behavioral and neural findings highlight category-specific mechanisms influencing PM performance.
• These tasks provide a valuable framework for future research on PM in diverse populations, including aging and clinical groups.