![]() ![]() ![]() Yet, little is known about how police officers construct, administer, and record eyewitness identification procedures for multiple suspects. Thus, while sequential dependencies did arise to some extent, results suggest that the integrity of identification and recognition decisions are not likely to be impacted by making multiple decisions in a row.Ī considerable proportion of crimes that involve multiple perpetrators. However, choosing behavior on previous trials did not predict individual recognition decisions on the current trial. Sequential dependencies were detected in recognition decisions over many trials, including recognition for faces: the probability of a yes response on the current trial increased if the previous response was also yes (vs. basic recognition) paradigm could account for the absence of hypothesized ability to predict patterns of sequential dependencies in Experiments 1 and 2. Experiment 3 examined whether differences in number of test trials in the eyewitness (vs. In Experiment 2, responses on the second showup contrasted previous choosing regardless of target-presence. ![]() In Experiment 1, responses on the third, target-present showup assimilated towards previous choosing. Across both experiments, evidence for sequential dependencies for choosing behavior was not consistently predictable. Participants watched a mock crime film involving three perpetrators and later made three showup identification decisions, one showup for each perpetrator. Experiments 1 and 2 tested whether initial showup identification decisions impact choosing behavior for subsequent showup identification responses. Research in perception and recognition demonstrates that a current decision (i) can be influenced by previous ones (i–j), meaning that subsequent responses are not always independent. The findings indicate that individual and multi-perpetrator homicides have distinctive dynamics and can be differentiated during investigations. Psychopathic offenders were likely to act alone in committing sexual homicides and to involve an accomplice in other types of murders, but they typically committed gratuitous violence against women regardless of whether they acted alone or with a co-perpetrator. Multi-perpetrator homicides tended to involve younger offenders, male victims, and instrumental motives. Compared to multiple perpetrators, individual perpetrators were more likely to be older and to target female victims, and their homicides were more likely to contain reactive, sexual, and sadistic elements. This study examined the crime, victim, and perpetrator characteristics of individual homicides (n = 84) versus multi-perpetrator homicides (n = 40), according to official file information from two Canadian federal penitentiaries. Little is known about the characteristics of homicides committed by more than one perpetrator. ![]()
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December 2022
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