Mental Processes

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April 10, 2026

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April 10, 2026

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"What happens when people witness an event, say, a crime or accident, and are later exposed to new information about the event? Two decades of research have been devoted to the influence of new information on the recollections of such witnesses. An all-too-common finding is that after receipt of new information that is misleading in some way, people make errors when they report what they saw. New, post-event information often becomes incorporated into a recollection, supplementing or altering it, sometimes in dramatic ways. New information invades us, like a Trojan horse, precisely because we do not detect its influence. Understanding how we become tricked by revised data about a witnessed event is a central goal of this research. Current research showing how memory can become skewed when people assimilate new data utilizes a simple paradigm. Participants first witness a complex event, such as a simulated violent crime or automobile accident. Subsequently, half the participants receive new, misleading information about the event. The other half do not get any misinformation. Finally, all participants attempt to recall the original event. In a typical example of a study using this paradigm, participants saw a simulated traffic accident. They then received written information about the accident, but some people were misled about what they saw. A stop sign, for instance, was referred to as a yield sign. When asked whether they originally saw a stop or a yield sign, participants given the phony information tended to adopt it as their memory; they said they saw a yield sign. In these and many other experiments, people who had not received the phony information had much more accurate memories. In some experiments, the deficits in memory performance following receipt of misinformation have been dramatic, with performance differences as large as 30% or 40%."

- Memory

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"The ability to apprehend a small number of items at one time in the conscious mind can be distinguished from the need to attend to items individually when a larger number of such items are presented. This point is one of the earliest to be noted in psychological commentaries on the limitations in capacity. Hamilton (1859) treated this topic at length and noted (vol. 1, p. 254) that two philosophers decided that six items could be apprehended at once, whereas at least one other (Abraham Tucker) decided that four items could be apprehended. He went on to comment: “The opinion [of six] appears to me correct. You can easily make the experiment for yourselves, but you must be aware of grouping the objects into classes. If you throw a handful of marbles on the floor, you will find it difficult to view at once more than six, or seven at most, without confusion; but if you group them into twos, or threes, or fives, you can comprehend as many groups as you can units; because the mind considers these groups only as units, – it views them as wholes, and throws their parts out of consideration. You may perform the experiment also by an act of imagination.” When the experiment actually was conducted, however, it showed that Hamilton’s estimate was a bit high. Many studies have shown that the time needed to count a cluster of dots or other such small items rises very slowly as the number of items increases from one to four, and rises at a much more rapid rate after that. Jevons (1871) was probably the first actual study, noting that Hamilton’s conjecture was “one of the very few points in psychology which can, as far as we yet see, be submitted to experiment.” He picked up handfuls of beans and threw them into a box, glancing at them briefly and estimating their number, which was then counted for comparison. After over a thousand trials, he found that numbers up to four could be estimated perfectly, and up to five with very few errors"

- Memory

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"Working memory is a fundamental aspect of executive cognition that is thought to encompass three primary mental processes: 1) the access of information, 2) “on-line” operation(s) on this information, and 3) the production of a motor output response based on these operations (Goldman-Rakic, 1987). At present, several distinct theoretical conceptualizations of working memory exist within the cognitive science literature (reviewed in Kimberg, D’Esposito, & Farah, 1998). This lack of consensus may be due, in part, to the functional complexity of working memory, which includes aspects of rehearsal, maintenance, short term storage, attention, and executive control (Kimberg, et al., 1998). Working memory is widely accepted as being dependent on the lateral frontal cortex (Fuster, 1997; Goldman-Rakic, 1987; Owen, et al., 1998; 1999; Owen, 2000), and plays an important role in the temporal coordination of guided behavior via the perception-action cycle (Fuster, 2000). Immediate serial recall and memory span tasks are two common tools used to assess working memory in humans (Baddeley, 1996). In such tasks, the participant is presented with a series of stimuli, and required to recall this stimulus string in sequential order (Baddeley, 1996). In these tasks, the likelihood of correct recall is directly related to the length of the stimulus string, and by manipulating the length of this string, the participant’s working memory capacity (memory span) can be assessed (Baddeley, 1996)."

- Memory

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