Eyewitness Testimony Case Study

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Eyewitness testimony has long been prized as the highest form of evidence in a courtroom, placing enormous value on the memory of a witness. After all, if someone has observed a crime, the details must be engrained in their memory, right? Well, not exactly. Unlike a fixed and pristine record of time, memory is a complex cognitive process which is not only determined by variables surrounding the actual event, but is also heavily influenced by the perceptions, interpretations, and emotions of the individual (Zaragoza & Mitchell, 1996). In fact, evidence suggests that the simple act of retelling a story alters the original memory, and that the power of suggestion can lead people to not only change the details of an incident, but in many cases, …show more content…

Such influences contribute to a witnesses’ natural tendency to confuse the details suggested with those which were truly witnessed, thus creating false memories (Zaragoza & Mitchell, 1996). In a study conducted by Zaragoza & Mitchell (1996), subjects watched a 5-minute video of a burglary followed by a car chase. A post event questionnaire containing several misleading, and suggestive details followed, and delayed in intervals of 10 minutes, 48 hours, or 1 week (Zaragoza & Mitchell, 1996). Exposure to suggestive material occurred from 0 to 3 times per participant, determining if repetition increased participants’ association of suggested material as being originally viewed in the film (Zaragoza & Mitchell, 1996). To address concerns that participants may have failed to differentiate between events they thought happened in the film, and the events which did occur in the film, an additional 5-question survey consisting of yes and no questions was administered (Zaragoza & Mitchell, 1996). Indeed, evaluation confirmed that the percentage of “yes” responses was far greater for three exposures than for one, and that repetition generated a significant increase in the participants’ confidence of association errors (Zaragoza & Mitchell, 1996). In other words, increased repetition led participants to not …show more content…

However, this time the slides ended right before a critical event occurred. Participants were then questioned, not only about the content of the missing slide, but also as to its source (slide material or narrations). Bi Zhu, Chuasheng, & Lotfus (2012) provided a ten-minute delay before the source monitoring test, which mirrored the content, and procedure of the initial study. As expected, false memory was identified 1.5 years after the initial exposure of misinformation, with about half of false memory being preserved between the 2 studies (Bi Zhu, Chuasheng, & Lotfus, 2012). This showed that the longevity of false memory is proportional to the rate of true memory (Bi Zhu, Chuasheng, & Lotfus, 2012). In other words, true and false memories do in fact decay at similar rates, and once an individual has a new memory, that memory will persist despite the

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