Russell A. Powell

Immediate and delayed incorporations of events into dreams: further replication and implications for dream function

The incorporation of memories into dreams is characterized by two types of temporal effects: the day‐residue effect, involving immediate incorporations of events from the preceding day, and the dream‐lag effect, involving incorporations delayed by about a week. This study was designed to replicate these two effects while controlling several prior methodological problems and to provide preliminary information about potential functions of delayed event incorporations. Introductory Psychology students were asked to recall dreams at home for 1 week. Subsequently, they were instructed to select a single dream and to retrieve past events related to it that arose from one of seven randomly determined days prior to the dream (days 1–7). They then rated both their confidence in recall of events and the extent of correspondence between events and dreams. Judges evaluated qualities of the reported events using scales derived from theories about the function of delayed incorporations. Average ratings of correspondences between dreams and events were high for predream days 1 and 2, low for days 3 and 4 and high again for days 5–7, but only for participants who rated their confidence in recall of events as high and only for females. Delayed incorporations were more likely than immediate incorporations to refer to events characterized by interpersonal interactions, spatial locations, resolved problems and positive emotions. The findings are consistent with the possibility that processes with circaseptan (about 7 days) morphology underlie dream incorporation and that these processes subserve the functions of socio‐emotional adaptation and memory consolidation.

Sleep Quality, Sleep Propensity and Academic Performance

We examined associations between measures of sleep propensity on the Epworth Sleepiness Scale, sleep quality on the Pittsburgh Sleep Quality Index and academic performance by GPA and grades in introductory psychology for 414 students. In the total sample, neither sleep propensity nor sleep quality correlated with GPA or introductory psychology grades. However, among students carrying a full course load, those reporting poor sleep quality performed less well on academic measures than those reporting a better quality of sleep. Further research is needed to assess the moderating influence of overall demands of daytime functioning on the association between sleep quality and academic performance.

TEMPORAL DELAYS IN INCORPORATION OF EVENTS INTO DREAMS

20 subjects viewed an emotionally arousing video and then recorded their dreams at home for seven nights. Dreams were subsequently rated for the likelihood that some aspect of the video had been incorporated. For subjects who showed strong evidence of incorporation, mean likelihood of incorporation ratings followed a U-shaped pattern, with significantly higher scores on Nights 1, 6, and 7 than on Night 4. The similarity of this temporal pattern with REM sleep patterns observed in rats exposed to various learning experiences is noted, and the role of the hippocampus as a possible neural mechanism for delayed incorporations is discussed.

Reversed Scototaxis during Withdrawal after Daily-Moderate, but Not Weekly-Binge, Administration of Ethanol in Zebrafish

Alcohol abuse can lead to severe psychological and physiological damage. Little is known, however, about the relative impact of a small, daily dose of alcohol (daily-moderate schedule) versus a large, once per week dose (weekly-binge schedule). In this study, we examined the effect of each of these schedules on behavioural measures of anxiety in zebrafish (Danio rerio). Adult wild-type zebrafish were administered either 0.2% ethanol on a daily-moderate schedule or 1.4% ethanol on a weekly-binge schedule for a period of 21 days, and then tested for scototaxis (preference for darkness) during withdrawal. Compared to a control group with no alcohol exposure, the daily-moderate group spent significantly more time on the light side of the arena (indicative of decreased anxiety) on day two of withdrawal, but not day 9 of withdrawal. The weekly-binge group was not significantly different from the control group on either day of withdrawal and showed no preference for either the light or dark zones. Our results indicate that even a small dose of alcohol on a daily basis can cause significant, though reversible, changes in behaviour.

Poster Session Abstracts

A random sample of therapists (N=161) working in the field of trauma were surveyed to study levels of stress. Therapists were assessed on measures of general life stress, burnout, and traumatic stress. Twenty-four percent were experiencing high levels of general life stress, 16% reported high levels of emotional exhaustion, 26% felt ineffective in terms of personal accomplishment at work and 14% were experiencing high levels of traumatic stress similar to clients with post traumatic stress disorder. Relationships between measures and demographic variables were reported, a profile of traumatised therapists was identified, and implications of these findings of therapists were presented.

Did Freud mislead patients to confabulate memories of abuse

Freuds abandonment of the seduction theory within a year of first proposing it has been the subject of considerable recent debate and speculation. Closer examination of Freuds writings, however, shows that he had often used highly suggestive procedures to elicit the memories of childhood “seductions” from his patients. Moreover, he had not considered alternative explanations for the evidence he presented when first claiming that these recovered memories of sexual abuse were real. Nevertheless, some present-day authors have argued for the validity of recovered memories by presenting much the same type of evidence that Freud once did. Research is needed to assess the extent to which recovered memories can be clearly corroborated and to establish rules for distinguishing between real and false memories of abuse.

Episodic-like memory in zebrafish

Episodic-like memory tests often aid in determining an animal’s ability to recall the what, where, and which (context) of an event. To date, this type of memory has been demonstrated in humans, wild chacma baboons, corvids (Scrub jays), humming birds, mice, rats, Yucatan minipigs, and cuttlefish. The potential for this type of memory in zebrafish remains unexplored even though they are quickly becoming an essential model organism for the study of a variety of human cognitive and mental disorders. Here we explore the episodic-like capabilities of zebrafish (Danio rerio) in a previously established mammalian memory paradigm. We demonstrate that when zebrafish were presented with a familiar object in a familiar context but a novel location within that context, they spend more time in the novel quadrant. Thus, zebrafish display episodic-like memory as they remember what object they saw, where they saw it (quadrant location), and on whichoccasion (yellow or blue walls) it was presented.

The Effects of Hypnosis on Dissociative Identity Disorder: A Reexamination of the Evidence:

Objective: To examine the possibility that hypnosis has significant iatrogenic effects on dissociative identity disorder (DID). Method: This paper reexamines previously published data that have been interpreted as indicating that hypnosis does not exert significant iatrogenic effects on DID. Results: The use of hypnosis is associated with differences in DID phenomenology and number of DID patients in treatment. Conclusion: Hypnosis may have significant iatrogenic effects on DID.

Nightmare frequency is related to a propensity for mirror behaviors

We previously reported that college students who indicated engaging in frequent dream-enacting behaviors also scored high on a new measure of mirror behaviors, which is the propensity to imitate another persons emotions or actions. Since dream-enacting behaviors are frequently the culmination of nightmares, one explanation for the observed relationship is that individuals who frequently display mirror behaviors are also prone to nightmares. We used the Mirror Behavior Questionnaire (MBQ) and self-reported frequencies of nightmares to assess this possibility. A sample of 480 students, consisting of 188 males (19.2±1.73 years) and 292 females (19.0±1.55 years) enrolled in a first-year university psychology course, participated for course credit. They completed a battery of questionnaires that included the 16-item MBQ, plus an item about nightmare frequency (NMF) in the past 30 days. NMF scores were split to create low, medium, and high NMF groups. MBQ total scores were significantly higher for female than for male subjects, but an interaction revealed that this was true only for Hi-NMF subjects. MBQ Factor 4, Motor Skill Imitation, paralleled this global interaction for females, whereas MBQ Factor 3, Sleepiness/Anger Contagion, was elevated only for Hi-NMF males. Item analyses indicated that Hi- and Med-NMF females scored higher than Lo-NMF females on the 3 items of Factor 4 that reflect voluntary imitation (imitating famous/cartoon voices, being a physically active spectator, and learning new skills by observing), as well as on 2 other items that reflect involuntary imitation (contagious yawning and self-rated empathy). Although Hi- and Lo-NMF males differed most clearly on the sleepiness item of Factor 3, all 3 items on this factor (including anger contagion and contagious yawning) are plausibly associated with perception of and response to social threat. Results provide evidence that among females nightmares are associated with voluntary and involuntary mirror behaviors during wakefulness, while among males nightmares are associated with threat-related mirror behaviors during wakefulness. They thus support the possibility that the association between mirror behaviors and dream-enacting behaviors is due to a common mirror neuron mechanism that underlies mirror behaviors and nightmares and that involves motor, rather than emotional, resonance. These results have implications for understanding the comorbidity of nightmares and other pathological symptoms such as imitative suicidal behaviors, the influence of observational learning on dissociative symptomatology, and the predominance of threat and aggression in the dream enacting behaviors of REM sleep behavior disorder.

DID FREUD MISINTERPRET REPORTED MEMORIES OF SEXUAL ABUSE AS FANTASIES

While serious questions have arisen concerning the validity of Freuds seduction theory of neurosis, a related issue concerns the extent to which Freud, following the abandonment of the seduction theory, may have misinterpreted real memories of sexual abuse as imaginary. Certain theoretical statements by Freud as well as his advice to Jung concerning a 6-yr.-old patient who had accused her foster-father of sexual abuse indicate that he may have been significantly biased toward interpreting certain types of incest allegations as fantasies. Increased awareness of Freuds biases, both in his early tendency to pressure patients into believing that they were victims of abuse and in his later tendency to regard certain types of incest allegations as unreal, may contribute to a more objective approach to the diagnosis and treatment of sexual abuse in the future.