This commentary discusses the recently published article by Andrews and Brewin (2024) that reanalyzed data collected by Murphy et al. (2023) to replicate the well-known “lost in the mall” study first published by Loftus and Pickrell (1995). We begin by outlining initial and more recent findings that brought the “lost in the mall” paradigm to the forefront of false memory research before considering the thought-provoking results of the reanalysis by Andrews and Brewin (2024). We then highlight some of the implications of the reanalysis for child sexual abuse investigations, and more broadly, for the reliability and validity of psychological research that relies on researchers' coding and interpretation of information provided by participants about the content of their memories. We ask whether the definition and measurement of false memories within laboratory experiments can be meaningfully applied to real-life debates concerning justice for alleged victims and perpetrators of sexual abuse.
In the 1970s Elizabeth Loftus and her team conducted a series of highly influential experiments demonstrating that misleading information received after a personal experience can lead people to make mistakes when they later try to describe what happened (Loftus and Palmer 1974; Loftus 1975). After establishing the impact of misinformation on memory for personal experiences, an innovative research paradigm was designed to demonstrate that memories of entire events that never occurred could be implanted in people's minds with relative ease. Loftus and Pickrell (1995) misled 24 adult participants to believe that their family members provided descriptions of four true past events, but unbeknownst to the participants, one of the supposed true events, being “lost in the mall”, was made up by the researchers. After participants were told that they had been lost in the mall many years earlier they were then asked to recall what they could remember in writing and verbally and rate the clarity of their memories. The results showed that a quarter of the participants were successfully induced to claim that they remembered the false event, although their average clarity ratings for the false memory were substantially lower than scores assigned to true events. (1) The “lost in the mall” study resulted in a “veritable explosion of cognitive research on the topic of false memory” (Pezdek and Lam 2007), (2), and led to the establishment of a new view of human memory as being particularly fragile and easily manipulated.
However, while most memory researchers accept that false memory implantation is possible, the proportion of people who can be induced to develop false memories has been the subject of fierce debate (Wade et al. 2002). Scrutiny of false memory implantation experiments identified two main challenges concerning the definition of f
然而,与最初的研究结果一致,参与者对虚假记忆的清晰度评级相对较低,并且一直低于真实记忆。重要的是,被研究人员判断为有错误记忆的参与者中,只有不到一半(14%)的人自我报告记住了该事件。Murphy等人(2023)除了公布他们的发现外,还公开了他们的数据文件和原始数据,允许其他研究人员重新分析他们的数据。Andrews和Brewin(2024)对Murphy等人(2023)数据的重新分析明确旨在解决上述对“迷失在商场”范式的批评:(1)研究人员识别的“错误记忆”可能不能反映真实的记忆,(2)研究人员识别的“错误记忆”实际上可能是参与者真实记忆的扭曲。为了调查这些问题,作者设计了一种更系统的编码方法,该方法依赖于计算参与者报告的关于建议事件的核心细节的数量,并在从“没有提及”到“明确回忆”的范围内评估每个细节的清晰度。研究人员还试图识别潜在的真实经历,方法是将在不同情况下的迷失与虚假事件、不止一次的迷失或与目标事件相似但实际上不涉及迷失的经历进行编码。重新分析的结果对25%-35%的人可以“记住从未发生过的整个事件”的说法提出了质疑(Loftus和Pickrell 1995,725)。重新编码的数据表明,平均而言,被Murphy等人(2023)的研究团队判断为错误记忆的参与者只能明确地回忆起6个核心细节中的1.47个。即使被判定有完全错误记忆的参与者也倾向于回忆不到一半的核心细节,20%的人没有明确回忆起实际上“迷路”的最基本细节。正如Murphy等人(2023)所指出的那样,自我报告记住目标事件的参与者比例(14%)大大低于被研究人员判断为产生错误记忆的参与者比例(35%)。Andrews和Brewin(2024)表明,参与者自己的记忆标准与核心细节的清晰度有关;那些自我报告有错误记忆的参与者比那些不相信自己记得事件的参与者明确地提到了更多的核心细节。重新分析的结果也证实了先前的担忧,即一些被研究人员判断为形成错误记忆的参与者可能指的是潜在的真实经历。根据Andrews和Brewin(2024)的研究,31%的参与者对过去经历的描述与虚假事件相似,但在核心细节上存在关键差异,例如在不同的购物地点迷路或被遗弃而不是迷路。这些潜在的真实经历对错误记忆率的影响不容忽视,因为在墨菲等人(2023)的判断中,50%的人有完全错误的记忆,52%的人有部分错误的记忆。基于他们重新分析的结果,Andrews和Brewin(2024)得出结论,先前使用“迷失在商场”范式的研究大大高估了产生错误记忆的人的比例。作者提出了三个步骤来改进记忆植入研究的方法:排除对目标事件有潜在真实经历的参与者,使用核心细节作为错误记忆的最低标准,以及在研究人员识别错误记忆的同时考虑自我报告措施。Andrews和Brewin(2024)使用逐步排除方法证明,将这些方法改进应用于Murphy等人(2023)的数据导致错误记忆率大幅降低,仅为4%。在他们最近的评论中,Wade等人(2025)质疑了这个数字的有效性,认为作者的标准排除了由暗示的细节和其他来源的记忆痕迹组合而成的真正的错误记忆。尽管如此,Andrews和Brewin(2024)的观点认为,完全错误的记忆比记忆植入研究更少见,这将使我们相信,这对错误记忆概念的现实应用以及在记忆研究领域使用研究人员编码的数据都有影响。 自最初的“迷失在商场”研究发表以来的30年里,错误记忆研究的结果已经远远超出了“恢复记忆”的范围,记忆植入显然很容易,参与者产生错误记忆的比例很高,这导致了一种普遍的观点,即儿童性虐待的错误记忆很常见,并可能导致数量未知的误判(暴雪和肖2019;克鲁克和麦克尤恩2019)。Wade等人(2025)对Andrews和Brewin(2024)的评论也表达了对司法不公的担忧,他们指出“实验室中的错误记忆率可能低估了真实案例中的错误记忆率,而研究表明,现实中存在的因素可能会夸大错误记忆形成的可能性”(3)。我们认为,当涉及到儿童性虐待的指控时,事实正好相反,记忆植入实验给人的印象是,基于错误记忆的指控比实际情况更常见。错误记忆率的膨胀部分是因为实验室研究依赖于一套特定的高度暗示性的技术来诱发错误记忆,部分是因为实验室研究没有考虑到在真实案例中降低错误指控可能性的因素。为了评估实验室研究对真实案例中错误记忆的频率提供了保守估计的说法,分解“迷失在商场”范式和其他记忆植入设计所依赖的大量暗示和欺骗方法是有帮助的,这些方法使参与者相信他们经历了一个虚假的事件。首先,研究者向参与者提供事件的核心细节,以“提醒”他们发生了什么,包括主要行动、事件发生的时间和地点、参与者的情绪反应以及危机的解决(Loftus and Ketcham 1994;Loftus,Pickrell;Murphy et al. 2023)。这些研究人员提供的元素提供了一个连贯的叙事框架,作为一个脚本或图式,使参与者很容易“填写”细节,即使他们没有亲身经历过。其次,引导参与者相信这些核心细节是由事件发生时在场的可信任的家庭成员提供的。鉴于实验范式不涉及参与者、亲属或其他任何人的利害关系,参与者没有理由怀疑他们的亲属会误导他们。此外,对虚假事件的描述是在参与者阅读了真实记忆的摘要之后呈现的,这消除了对这些描述真实性的潜在怀疑。并非所有的记忆植入研究都涉及这些暗示的“把戏”,但那些改变已证实公式的研究倾向于添加不同的欺骗元素,例如向参与者展示与目标事件相关的假照片或材料(例如,Braun等人,2002;Wade et al. 2002)。此外,错误记忆研究还依赖于重复的回忆尝试(包括小册子和连续的采访),以最大限度地提高参与者默认建议的可能性。尽管成人和儿童可以通过多次采访准确地回忆起他们真实经历的事件,但大量研究表明,由于暗含技巧和重复回忆场合的结合,错误细节的增加(La Rooy et al. 2009)。因此,尽管有些人持相反的观点,植入虚假记忆并不是一件简单的事情,它需要在实验室条件下使用一套特定的高度暗示性的技术。也许更重要的是,研究表明,真实案例涉及的因素可以减少对儿童性虐待的虚假指控的可能性,包括事件的不真实性,儿童不愿披露虐待,以及防止基于错误记忆的司法不公的程序保障。Andrews和Brewin(2024)强调,对“在商场迷路”范式的一种批评是,“迷路”是一种常见的或看似合理的事件。即使我们自己没有经历过迷失,我们中的大多数人也有一种模式;迷失是许多书籍、电视节目和其他媒体的主题,所以很容易想象迷失会是什么样子。然而,大多数儿童,没有接触到极端的暗示,没有儿童性虐待的图式。Pezdek和Hodge(1999)进行了一项研究,他们观察了年龄较小(5-7岁)和较大(9-12岁)的儿童对可信事件(如在商场迷路)和不可信事件(如接受直肠灌肠)的错误记忆的易感性。在这项研究中,大多数孩子都没有回忆起虚假事件,但那些回忆起可信事件的孩子比不可信事件的孩子更容易回忆起可信事件。 该研究的结论是,不太可能将错误记忆植入不太可信的事件,这与一项研究一致,该研究显示,在真实的医学检查中,即使是最小的孩子,对生殖器触摸的错误暗示的默许率也非常低(Saywitz et al. 1991)。这一点很重要,因为我们认为,
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