Title: Stress and Eyewitness Memory - IResearchNet
Headings: Stress and Eyewitness Memory
Stress and Eyewitness Memory
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Content: Some researchers found that accuracy suffered when witnesses were under stress, others found that it was unaffected, and a minority of researchers reported improvements in accuracy. This ambiguity can be explained, in part, by variations in the degree of stress. The Yerkes-Dodson law proposes that the relationship between arousal and performance can be plotted as an inverted U, where with moderate increases in arousal, performance is improved but with too much arousal performance declines. This theory was subscribed to by many researchers, and initially, it was thought to provide an explanation for the seemingly contradictory pattern of research findings. The studies that found improvements may have elicited an optimal level of stress or arousal, whereas those studies that had found decrements had exceeded that optimal level of stress. However, this explanation proved inadequate as the body of research grew because of the difficulty in comparing degrees of stress and also because of findings indicating that stress is not a unidimensional construct, as proposed by the Yerkes-Dodson law, but instead has multiple components (e.g., physiological, affective, cognitive, behavioral, etc.). An alternative explanation is that with higher levels of emotional stress, the observer’s attention becomes narrower and more focused. As a result, memory for central and closely attended-to details improves, while memory for more peripheral details declines. This distinction between central and peripheral details also helps explain some of the inconsistent findings, where stress sometimes helps but at other times impairs memory. Research reviews and meta-analyses of the topic reveal that, taken as a whole, stress has more of a negative than a positive impact on eyewitness memory in terms of both identification of the perpetrator and recall of event details.