Strategies for verifying false autobiographical memories

This study examined the types of strategies people use to verify putative childhood memories and the degree to which their preferred strategies are restricted in typical memory implantation studies. We asked subjects to describe a situation in which they recalled a false childhood experience and a hypothetical situation in which they pretended to have developed a false memory after taking part in a memory implantation study. We also asked them how they did (or would) determine the source of the event. We found that subjects relied primarily on other people and cognitive strategies to verify their experiences. These results suggest that laboratory situations cultivate false memories in part because they prevent people from talking to others about the false event, which causes them to rely on less optimal strategies.     

虚假供述影响因素及法律控制

本文以虚假供述的研究方法为起点,结合案例,对自愿型、强迫—服从型和强迫—内化型三种类型的虚假供述进行介绍,从个人因素与情境因素两个方面,对虚假供述的影响因素加以分析。其中,着重阐述了虚假供述的实验室研究范式。在评析影响因素的基础上对我国刑事诉讼的修改提出立法建议,以期在法律上控制影响因素的作用。     

Simulating the variability of actual outcomes

A method is described for simulating the variability of outcomes encountered in a variety of settings. Outcome values falling within a specified range are randomly generated and presented across subjects and trials, so that, over time, the average values seen by all subjects in a condition are the same. Randomly varying reinforcement dimensions (such as magnitude) over trials for each subject is recommended to enhance both the internal and the external validity of laboratory results. In addition, it can be used to study the effects of the variability or uncertainty of outcome dimensions such as magnitude and duration in investigations of behaviors such as matching, melioration, and behavioral momentum.     

Judging health status: effects of perceived prevalence and personal relevance

In this article, we show that people's evaluations of the seriousness of a health disorder are influenced by the perceived prevalence and personal relevance of that disorder. As part of a study ostensibly concerned with college students' health characteristics, 60 undergraduates were "tested" for the presence of a fictitious enzyme deficiency. The subjects discovered either that they had the deficiency (deficiency-present subjects) or that they did not have it (deficiency-absent subjects), and were led to believe either that 1 of the 5 people in the laboratory had the deficiency (low-prevalence subjects) or that 4 of them had it (high-prevalence subjects). As predicted, the low-prevalence subjects evaluated the deficiency as more serious than did the high-prevalence subjects. In addition, consistent with the view that personal relevance affects perceptions of health disorders, the deficiency-present subjects evaluated the deficiency as less serious than did the deficiency-absent subjects. The deficiency-present subjects also derogated the validity of the test ostensibly used to diagnose the deficiency compared with other subjects. Finally, the deficiency-present subjects requested more information about the deficiency than did the deficiency-absent subjects.     

Inducing signal-verified lucid dreams in 40% of untrained novice lucid dreamers within two nights in a sleep laboratory setting

Dreams in which the dreamer is aware of the dream state (lucid dreams, LD) are difficult to induce in naïve subjects in-laboratory. Recently, Stumbrys and Erlacher (2014) used a combination of existing induction techniques together with a self-developed experiment protocol and achieved comparatively high LD induction rates. In this study, we simplified their methodology slightly and repeated their experiment with twenty naïve subjects who spent one or two nights in our sleep laboratory. After about six hours of sleep, they were woken up during REM sleep and engaged in a series of cognitive tasks before going back to bed. Ten subjects reported a LD during the following period of sleep in one of the nights. Eight of these subjects gave a predefined eye signal, which was clearly visible in the electrooculogram during REM sleep. In summary, we replicated Stumbrys and Erlacher’s results using a simplified version of their induction protocol.     

Generalization in the effects of a mood induction procedure

Mood Induction Procedures (MIP's) requiring subjects to read depressing self-referent statements have recently been employed in laboratory analogues of depression. Although these procedures have been shown to effect mood, their effectiveness in producing more general changes in behaviour has been less consistent. An alternative MIP was used in this study. Thirty-two male and female students listened either to a depressing or an affectively neutral tape. The MIP produced significant mood disturbance and significant decrease in self-rated activation. However, during the test phase, the MIP group showed greater behavioural activation in a counting speed measure, and facilitated performance on a shuttlebox noise-escape task. Evidence is presented which suggests that this represented a characteristic initial response by depressed and helpless subjects on laboratory tasks.     

An automated eye movement laboratory for on-line electrooculography

This paper describes an automated eye movement laboratory that uses electrooculography (EOG) to study people’s eye movements while they read. An on-line minicomputer processes bioelectric potentials that correspond to saccadic eye movements. Horizontal saccades larger than 1.5 deg of visual angle are detected and analyzed in real-time as they occur. The laboratory is designed for prolonged yet unobtrusive observation of human eye movements during sustained reading periods of minutes or hours. All important functions regarding data collection and data reduction are performed automatically, according to simple procedures that can be applied uniformly and without bias to nearly all subjects that we study. Results from three experiments are cited in order to quantify the performance of the laboratory with respect to four criteria: saccade detection accuracy, measurement accuracy, sensitivity, and the uniformity of these measures over different subjects.     

Category Use in Abstract Mental Comparisons

A recent model proposes that at least two processes are involved in mental comparisons; use of analogue and use of category information. The evidence that category information is used is not strong, however. It comes mainly from studies which had subjects overlearn the objects associated with arbitrary categories in the laboratory, and which used concrete dimensions. In the present study, two experiments were conducted to see if subjects spontaneously use natural categories from an abstract dimension (occupational status) in mental status comparisons. Subjects scaled occupations into status categories before each experiment and then compared the status of within-category and between-category occupation pairs. Within-category status comparisons reliably took longer than between-category ones of the same distance, suggesting that natural status categories were used.     

Psychologie du frisson esthétique

This study concerns the problem of aesthetic emotions and that of aesthetic chills in particular. We asked thirty subjects to describe a narrative structure (film, play, book) eliciting chills and the phenomenology of the aesthetic experience. A number of non-random redundancies are observable. The stimuli eliciting positive aesthetic chills in our population have a sensorial dimension and their particular properties are often the selfless actions, existential considerations of a very general nature (e.g., the meaning of life), moments of inner recollection or quiet reflection, situations of solidarity and communion (family, couple, friends) or, on the contrary, situations of violent separation (family, couple, friends). In general, when real events are at stake (and not fictional scenes as in a film or a novel), subjects describe situations where they are safe, where they trust the environment.     

The influence of preexperimental experience on social discrimination in rats (Rattus norvegicus)

The authors used laboratory rats (Rattus norvegicus) of known relatedness and contrasting familiarity to assess the potential effect of preexperimental social experience on subsequent social recognition. The authors used the habituation-discrimination technique, which assumes that multiple exposures to a social stimulus (e.g., soiled bedding) ensure a subject discriminates between the habituation stimulus and a novel stimulus when both are introduced simultaneously. The authors observed a strong discrimination if the subjects had different amounts of preexperimental experience with the donors of the 2 stimuli but a weak discrimination if the subjects had either equal amounts of preexperimental experience or no experience with the stimuli. Preexperimental social experience does, therefore, appear to influence decision making in subsequent social discriminations. Implications for recognition and memory research are discussed.     

The influence of gender, hypertension risk, and aerobic fitness on cardiovascular responses to laboratory-induced stress

The study sought to evaluate the influence of gender, hypertension risk, and aerobic fitness on cardiovascular responses to laboratory-induced stress. Sixty nonsymptomatic subjects (30 males, 30 females) participated in the experiment. Half of the subjects had at least one biological parent with hypertension, while half had no parental history of hypertension and served as comparison subjects. Subjects completed a laboratory procedure measuring cardiovascular responses (i.e., pulse rate and blood pressure) while performing stressful laboratory tasks (i.e., the Stroop Color Naming Test and a sham IQ test). Aerobic fitness (i.e., VO_2max using the Bruce protocol) was also determined using a submaximal treadmill test in the laboratory. Results suggest that males with a family history of hypertension were more stress responsive based on systolic blood pressure, while females were more stress-responsive according to pulse rate activity. Fitness levels were significantly associated with diastolic blood pressure throughout the stress and recovery periods but were unrelated to pulse rate and systolic blood pressure.     

Prevention of the development of problem behavior: A laboratory model

Few studies have isolated the preventive efficacy of common behavioral strategies like noncontingent reinforcement (NCR) and differential reinforcement of alternative behavior (DRA). The purpose of the current study was to develop and evaluate a laboratory model of these two problem behavior prevention strategies. Undergraduate students participated in a computer simulation, in which clicks to a designated area of the computer screen were analogous to the emergence of problem behavior. The responding of participants in a control group, who experienced a percentile schedule used to mimic the shaping of problem behavior, was compared to that of participants in two experimental groups, each with a history of either DRA or NCR. Between‐subjects group comparisons showed that both intervention strategies were equally effective in the prevention of our analog to problem behavior when compared to the control group. The strengths and limitations of a laboratory model for prevention are discussed in light of recent applied work in this area.     

Pilot programs in newborn screening

The term "pilot study" has been used over the years to describe the evaluation of the many elements involved in deciding whether a proposed condition should be added to a newborn screening (NBS) panel, and until recently, was unilaterally used to describe the evaluation of the assay to be used before the condition was officially adopted by a state for its newborn screening panel. Since Guthrie's introduction of screening for PKU, each time a new condition was added to the panel, the screening assay itself was validated through a population-based trial, in which the test was performed with de-identified samples to avoid association between the test result and the infant. This is considered by the laboratory as the "pilot phase" of adding a new condition. To advance the science of NBS, especially to accommodate new technologies that may provide new types of information (genetic versus physiological) for each new condition, pilot programs are essential. Involvement of the clinical community serves to improve these evaluations and provides the needed clinical validation of decisions made as a result of it. This paper describes the historical context of pilot programs in population-based NBS that utilize laboratory-based markers as indicators of concern; specifically, three applications that demonstrate different approaches to the use of pilots in adding conditions to a NBS panel are described.     

The Effects of Feedback Equivocality on Escalation of Commitment: An Empirical Investigation of Decision Dilemma Theory1

The effects of feedback equivocality on escalation of commitment were examined in a laboratory study. Subjects had multiple opportunities to allocate money to market a software product. During the initial phase, subjects received feedback that was of either low or high equivocality. Half of the subjects in each equivocality level were given a standard by which to judge the feedback. In the second phase, all subjects received negative feedback. Consistent with Bowen's (1987) decision dilemma theory, subjects who received low equivocality feedback did not escalate allocations, and subjects who received high equivocal feedback escalated allocations. The presence of a standard or goal attenuated escalation. These results are consonant with a dynamic, temporally based account of escalation and are discussed in a synthesis of the literatures in behavior analysis, economics, forecasting, and psychology.     

Correspondence between personality trait ratings and behavioral events

To investigate the validity of the trait, Energetic, two studies were conducted in which trait ratings of Energetic and objective measures of performance were recorded. The first study used naive raters (N= 55) who observed pairs of subjects perform in a laboratory setting. There was 84% agreement (p < .001) among the raters as to which person was more Energetic, and people rated as more Energetic performed more energetically on the objectively measured tasks (p < .001). The second study used peer ratings of Energetic and objective measures of energetic behavior in a laboratory setting. There was high agreement among the peers in ratings of Energetic, r = .95 (N = 30) and r = .93 (N = 31) for two groups. Nine men from the upper-quartile and nine men from the lower-quartile of the Energetic scores were tested in the laboratory and were given a structured interview regarding their physical activities. The correlation between peer ratings and laboratory performance was .56 and between peer ratings and the interview data, .64. The results support the position that trait ratings can be valid indicators of regularities in behavior. The procedures used in these studies could be a generally useful model for investigations of the validity of trait ratings.     

Is the benefit of retrieval practice modulated by motivation?

Retrieval practice tends to produce better long-term learning than rereading, but laboratory studies have typically used arbitrary material that subjects may not care to learn. The observed advantage of retrieval practice may be exaggerated because low motivation may result in deficient processing during (usually passive) rereading. Thus, when subjects are motivated to learn the material, the type of study strategy (whether retrieval practice or rereading) might be less important. To test this hypothesis, we conducted 3 experiments in which we manipulated the incentives (using monetary bonuses or time savings) for learning Swahili–English word pairs. Items that had undergone retrieval practice were better recalled than reread items on a final test 2 days later, but this effect did not interact with incentive level. These results provide some reassurance that lab findings from the testing effects literature likely generalize to real-world situations in which motivation to learn may be greater.     

Sensitivity to the cognitive and affective qualities of odours

This study examined cognitive and emotional responses to odours in the laboratory in relation to everyday attitudes toward odours. A total of 136 subjects completed a questionnaire about the role of Odours in Everyday Life (OELQ) and their responses were summed to develop an index of overall responsiveness to odours: 36 subjects, who were in the top and bottom quartiles on this index, rated pleasant (e.g., rose) and unpleasant (e.g., synthetic sweat) odours in the laboratory on 7-point scales. Separate factor analyses were done for the OELQ items and the laboratory ratings, and these factors were intercorrelated. The factor analysis on the OELQ data yielded three primary factors, encompassing the Sexual Role of Bodily Odours, Ecological Odour Sensitivity, and Odour-evoked Memories, as well as three secondary factors. Two factors were derived from the laboratory ratings contrasting Cognitive (sensations, images, memories) and Affective (pleasant, soothing, energising) Responses. Correlations among the factors showed that Ecological Odour Sensitivity in everyday life was correlated with strong Cognitive but weak Affective Responsiveness to the laboratory odours. In contrast, the Sexual Role of Bodily Odours (OELQ) was positively correlated with Affective Responses to the odours in the laboratory. These data underscore the dual role of odours in stimulating cognitive and affective reactions both in everyday life and in the laboratory.