The effect of shared distinctiveness on source memory: An event-related potential study
Michael Weigl1,2, Hong Hanh Pham3, Axel Mecklinger3
1Department of Psychology, Experimental Neuropsychology Unit, Saarland University, D-66041, Saarbrücken, Germany. m.weigl@mx.uni-saarland.de.
Cognitive, Affective & Behavioral Neuroscience
|August 26, 2020
Summary
Shared distinctiveness enhances source memory and illusory correlations by accentuating category differences. This effect, observed in distinct category combinations, suggests attention allocation plays a key role.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Research
Background:
- Illusory correlation (IC) describes the false perception of a relationship between unrelated categories.
- The Shared Distinctiveness Approach (SDA) posits that ICs arise from increased memory accessibility of distinctive category combinations.
- Empirical support for the SDA is inconsistent, necessitating further investigation.
Purpose of the Study:
- To investigate the role of shared distinctiveness in illusory correlations using event-related potentials (ERPs).
- To examine how distinctiveness at encoding influences memory performance and frequency estimation.
- To test the hypothesis that shared distinctiveness enhances P300 subsequent memory effects (SMEs) and source memory.
Main Methods:
- Participants were presented with words varying in valence and font color to create distinctiveness.
- Event-related potentials (ERPs), specifically the P300 component, were recorded during word presentation.
- Behavioral measures included source memory performance and frequency estimation tasks.
Main Results:
- Behavioral data confirmed shared distinctiveness effects on source memory and frequency estimation.
- Memory was unexpectedly enhanced for frequent items with a common characteristic (positive valence, frequent color).
- Shared distinctiveness did not directly modulate the P300 SME, suggesting an indirect contribution to encoding.
Conclusions:
- Shared distinctiveness is linked to improved source memory and the formation of illusory correlations.
- Distinctiveness processing may involve attention allocation to extreme category combinations, heightening perceived differences.
- The findings suggest that distinctiveness influences memory and perception through attentional mechanisms rather than solely through direct memory enhancement.
