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PSY328H5 (9)

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University of Toronto Mississauga
Dax Urbszat

CHAPTER 4: PART ONE MEMORY IN LEGAL CONTEXTS: REMEMBERING EVENTS, CIRCUMSTANCES, AND PEOPLE - eyewitness testimony: a recollection of the actions, circumstances, and the people involved by witnesses and/or victims of a crime. - Crimes involving a single witness or victim, additional material or circumstantial corroborating evidence are often not available. - Scientific research on eyewitness testimony draws heavily upon the fields of cognitive psych. (perception, short and long term memory, thinking, decision making) and social psych. (influence of social variables upon human behaviour i.e, conformity, self-presentation, attitudes) - Variables related to eyewitness testimony: the effects of witness age, time delay between observation and report, repeated and suggestive questioning procedures, mental rehearsal, and identification decisions. - A useful distinction frequently made by researchers in the area of eyewitness testimony is that between system and estimator variables - System variables are those features of the legal system that can alter the reliability of eyewitness testimony i.e.: kinds of identification procedures used. o b/c these features can be controlled, changes can be made to them to improve the reliability of eyewitness testimony. - estimator variables refer to the situational and personal characteristics inherent in a event, its witnesses and consequences o we have no control and must estimate the magnitude of their effects o ie: a witness age is unknown to be related to identification performance, but the age of witnesses cannot be controlled o ie: the lighting at the scene of a crime is related to accuracy of descriptive testimony, but its effect upon a single witness can only be estimated. Basics of Memory and its implications for Eyewitness Testimony - most judicial systems have developed rules of evidence, whereby the admissibility of evidence is assessed based in part on its reliability - How accurate or reliable is eyewitness testimony? - we must first assume that an event was indeed witnessed and perceived as to its meaning (encoding stage), and then processed in such a way (storage stage) as to make it available later through one of several kinds of memory tests (retrieval stage). important to recognize the possibility of several stages or types of processing b/c the greater then # of stages and cognitive activities, the greater the opportunities for error or low reliability. - Memory is an active process where information is located - We never actually see anyones memories, instead we call memory as a product of a sequence of unobservable cognitive activities - K. v. Keegstra (1992) the Alberta Court of Queens Bench ruled in favor of allowing written classroom notes written by students years earlier to be admitted in place of the students own personal memories if the students themselves could not remember that statements made by the accused (their teacher) o this was known as past recollection recorded info. removed from the witnesss current memory and different from a currently available memory record that has merely been refreshed by reviewing a set of notes. - different kinds of memory tests at the retrieval stage can influence how well something is remembered. - Ex: essay recall memory v.s multiple choice recognition memory - Another kind of retrieval test is the identification of a suspect in a show-up -- a photospread of peoples pictures from police files or a live line-up -- that includes the actual suspect and foils and distracters. WHAT THE LEGAL SYSTEM EXPECTS FROM US - eyewitness testimony is admissible in court as opposed to fingerprints which are indirect or circumstantial evidence - jurors and judges are expected to remember the evidence presented w/o benefit of written notes or tape recordings - the amount of time a witness has to observe a perpetrator and the length of time between the witnesss observations and the identification of a police suspect (called the retention interval) are two common factors to consider in crimes involving eyewitness testimony - increasing the duration of both variables has opposite effects upon reliability -- longer observation times will increase reliability, while longer retention intervals will decrease it. - When memories have been tested, some analyses of reports by witnesses to actual crimes have indeed found high levels of accuracy following delays of up to 6 months or more. - Ex: Adolph Beck was mistakenly identified by 14 witnesses as being an English scam artist who had swindled them of their jewelry and money. - Some variable have consistent effects upon eyewitness performance such as centrality of info. to be recalled such as a weapon or hold-up note that are more likely to be remembered correctly than are other variables - In general, the greater the emotionality of an event, the greater the magnitude of the recollection ELICITING INFORMATION FROM VICTIMS AND WITNESSES - information is the raw material with which a case is built. Verbal Recall Testimony - in the initial stages of an investigation the information obtained is likely to come from the witnesses responses to W5 interview type questions Where and when did the event occur?, Why were you there? etc, asked by professionals in the justice system such as police investigators , social workers, lawyers, and insurance investigators. - Origins of the current state-of-the-art investigative interviewing procedures can be traced to 3 research areas: hypnosis, encoding specificity, and misleading post- event information. - Hypnotism o Franz Mesmer mesmerized o Mesmer was convinced that (just as Newtons gravity explained the magnetic- like attraction between objects) animal magnetism explained his ability to influence other peoples behaviour from a distance animal magnetism o He apparently cured minor ills by waving and lying his hands to induce a sleep-like trace on those willing to participate. o No one disputed the apparent effects of this procedure, but scientific investigators placed the explanation of those effects on the minds of Mesmers subjects rather than in the hypothetical mechanism of animal magnetism. o There is still debate as to whether hypnosis represents a distinct state of consciousness or if it merely occupies an extreme position along some continuum of suggestibility still hypnosis is a well-established technique, widely used around the world in therapeutic settings to enhance the recall of witnesses in police investigations. o hypnotically refreshed testimony -- term used to describe the fact the people often recall more accurate details about an event under hypnosis than they do in a normal state. - based on some implicit and unsupported beliefs about memory: 1. hypnosis allows access to memories beyond what normal retrieval processes can provide 2. that memories are retained permanently in the brain uncontaminated by additional experiences, thoughts and misleading information - in reality, hypnosis incorporates a combination a normal retrieval processes (ie: relaxation instructions, increased motivation, etc) that can assist a witness to recall additional material beyond the first police interview some of which is incorrect - the primary arguments against the use of hypnosis in forensic settings arise from demonstrations that hypnotized witnesses more frequently recall incorrect or false information during hypnosis than do non-hypnotized participants and that such information can be implanted through suggestive questioning techniques a negative triple whammy against the use of hypnosis - as a consequence of the vulnerability of reports gained through hypnosis, such evidence is not usually admissible in Canadian courts, but can be admitted - alternative interviewing technique Cognitive Interview PART TWO (pgs. 104 111) Verbal Recall Testimony Hypnosis allows access to memories and are retained permanently in the brain uncontaminated by additional experiences, thoughts, and possibly misleading information Hypnosis incorporates a combination of normal retrieval processes (eg., relaxation instructions, increased motivation, cognitive focusing) that can help witness to information in which some is incorrect Reports gained through hypnosis, such testimony or evidence is not usually admissible in Canadian courts of law Can be admitted as it was from 3 witnesses to a shooting in R. v. Gauls (1994) court in this case concluded that hypnotic procedure followed appropriate cautious guidelines and unlikely to taint witnesses testimony Tulving and Thomsons (1973) concept of encoding specificity recall is improved when retrieval environment matches the encoding environment to an extent that cues available at encoding are present at retrieval because presence of cues serves to elicit associated information The greater the overlap,
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