Variations in recollection: the effects of complexity on source recognition
Colleen M Parks1, Linda J Murray, Kane Elfman
1Psychology Department, University of Nevada, Las Vegas, NV 89154-5030, USA. colleen.parks@unlv.edu
Summary
Recollection may not be a simple threshold process. Increased complexity in memory tasks makes recollection appear more graded, influencing how we measure memory accuracy using receiver operating characteristics (ROCs).
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Research
Background:
- The nature of recollection in memory is debated, with evidence supporting both threshold and signal detection models.
- Receiver operating characteristics (ROCs) and their transformations (zROCs) are key tools in this debate, with U-shaped zROCs often linked to recollection thresholds.
- Existing research shows zROCs can be linear, potentially due to familiarity, but a graded recollection model offers an alternative explanation.
Purpose of the Study:
- To investigate the
Main Methods:
- Manipulated stimulus complexity (words vs. sentences) and source complexity (audio vs. video).
- Introduced conditions known to impair recollection, such as divided attention and amnesia.
- Analyzed the shape of source zROCs under varying complexity and recollection impairment conditions.
Main Results:
- Increased stimulus and source complexity led to flatter source zROCs.
- Divided attention and amnesia similarly affected source memory across simple and complex conditions.
- These findings suggest complexity influences the graded nature of recollection, not just familiarity's utility.
Conclusions:
- Recollection can appear more graded under high complexity, leading to curved ROCs.
- The study supports a graded recollection model, challenging a strict threshold view.
- Results have implications for memory measurement models and recognition memory theories.
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