Kitty Klein

Expressive writing can increase working memory capacity.

The effect of emotional disclosure through expressive writing on available working memory (WM) capacity was examined in 2 semester-long experiments. In the first study, 35 freshmen assigned to write about their thoughts and feelings about coming to college demonstrated larger working memory gains 7 weeks later compared with 36 writers assigned to a trivial topic. Increased use of cause and insight words was associated with greater WM improvements. In the second study, students (n = 34) who wrote about a negative personal experience enjoyed greater WM improvements and declines in intrusive thinking compared with students who wrote about a positive experience (n = 33) or a trivial topic (n = 34). The results are discussed in terms of a model grounded in cognitive and social psychological theory in which expressive writing reduces intrusive and avoidant thinking about a stressful experience, thus freeing WM resources.

The reliability and stability of the turner and Engle working memory task

The present study explored the psychometric properties of Turner and Engle’s (1989) operation span task, a widely used measure of working memory capacity. We administered the task three times to 33 college students, using equivalent test materials. The interval between the first and second administrations was 3 weeks, with 6–7 weeks between the second and third administrations. Alpha coefficients were all .75 or more. Recall accuracy decreased as operation set size increased. Raw test-retest correlations ranged from .67 to .81, the corrected reliability was .88, and stability scores ranged from .76 to .92. Performance improved from the first to the second test. Relative to reported reliabilities of other tasks used to assess individual differences in working memory capacity, the operation span task appears to have several statistical advantages.

Word Use in Emotional Narratives about Failed Romantic Relationships and Subsequent Mental Health

The authors investigated how word use in a stressful narrative is related to levels of grief and intrusive and avoidant thinking associated with the stressful event. A total of 218 college students who had experienced the breakup of a romantic relationship during the preceding 12 months produced a written narrative of the relationship and subsequent breakup using an expressive writing procedure. Participants used more negative emotion, cause, sensory, and first person singular words when describing the breakup in comparison to describing the period when they were still dating. In addition, greater avoidance of the breakup predicted greater use of negative emotion, first person singular and third-person pronouns, and less use of cognitive words. Conversely, levels of grief predicted less use of causal words and greater use of first person singular pronouns. The authors argue that use of cognitive words reflect an active search for meaning and understanding of the stressful event.

Relationship of life stress and body consciousness to hypervigilant decision making.

I. L. Janis and L. Manns (1977) model was used to study the relationship of naturally occurring life stress and private body consciousness (PBC; L. Miller, R. Murphy, & A. Buss, 1981) to decision making. Students (N=61) performed an analogies task developed by G. Keinan (1987). Hierarchical regression analyses indicated that performance quality could be explained byaversive life event stress, PBC, state anxiety, and their interaction. The greater the state anxiety, the poorer the performance. For low PBC individuals there was little relationship between life stress and decision quality or strategies

Autobiographical Memories for Very Negative Events: The Effects of Thinking About and Rating Memories

In three related experiments, 250 participants rated properties of their autobiographical memory of a very negative event before and after writing about either their deepest thoughts and emotions of the event or a control topic. Levels of emotional intensity of the event, distress associated with the event, intrusive symptoms, and other phenomenological memory properties decreased over the course of the experiment, but did not differ by writing condition. We argue that the act of answering our extensive questions about a very negative event led to the decrease, thereby masking the effects of expressive writing. To show that the changes could not be explained by the mere passage of time, we replicated our findings in a fourth experiment in which all 208 participants nominated a very negative event, but only half the participants rated properties of their memory in the first session. Implications for reducing the effects of negative autobiographical memories are discussed.

Disruptive effects of disconfirmed expectancies about crowding.

The experiment utilized a 2 (high vs. low room density) X 2 (forewarning of a crowded room vs. no forewarning) X 2 (simple vs. complex task) design to examine the effects of anticipation of crowding on task performance. More tasks were attempted and efficiency was higher when expectancies about the crowd were confirmed. Subjects not told to anticipate a crowd who actually worked under high density and subjects warned about a crowd that did not materialize performed most poorly. These differences were largest for the complex task. Baum and Greenbergs results were replicated with the performance data. Perceptions of the experimental room also differed as a function of anticipation, but failure to obtain a Crowding X Anticipation interaction did not support their hypothesis that anticipating a crowd induces identical perceptions to those obtained under actual crowding. The results are discussed in terms of disconfirmed expectancies being disruptive of performance, particularly complex task performance.

The costs of suppressing stressful memories

We investigated the costs of suppressing emotional and nonemotional memories, as evidenced in response times on a concurrent sentence verification task with three levels of syntactic complexity. Participants suppressing memories of personal negative experiences (n=26) had slower response times compared to the control group (n=23) and to participants suppressing nonemotional memories (n=25) particularly on the most complex sentences. Participants suppressing nonpersonal negative experiences (n=26) did not differ from either of the other two suppression groups. Suppression failures did not differ between conditions, but failures during the sentence task were related to the intrusiveness of the memory being suppressed. The findings indicate that different kinds of memories have different suppression costs and that even successful thought suppression can impair performance on concurrent tasks, supporting Wegners ironic processing model in which suppression attempts must compete with other ongoing tasks for scarce mental resources.

Memory and Coping with Stress: The Relationship Between Cognitive-Emotional Distinctiveness, Memory Valence, and Distress

Cognitive–emotional distinctiveness (CED), the extent to which an individual separates emotions from an event in the cognitive representation of the event, was explored in four studies. CED was measured using a modified multidimensional scaling procedure. The first study found that lower levels of CED in memories of the September 11 terrorist attacks predicted greater frequency of intrusive thoughts about the attacks. The second study revealed that CED levels are higher in negative events, in comparison to positive events and that low CED levels in emotionally intense negative events are associated with a pattern of greater event-related distress. The third study replicated the findings from the previous study when examining CED levels in participants’ memories of the 2004 Presidential election. The fourth study revealed that low CED in emotionally intense negative events is associated with worse mental health. We argue that CED is an adaptive and healthy coping feature of stressful memories.

The Subject-Experimenter Contract: A Reexamination of Subject Pool Contamination:

We conducted three experiments to investigate: (a) the extent to which student research participants believe they will disclose details of their experiences, (b) how much subjects actually will disclose immediately following a request not to reveal information, and (c) how much they will disclose after a 2-week interval. Disclosure rates increased across the experiments. In the first experiment, one fifth of the subjects indicated that they probably would not preserve confidentiality, whether or not they believed it was important to do so. In the second experiment, signing a pledge not to discuss the experiment resulted in less disclosure, but over one third of the subjects revealed information to a confederate. In the third experiment, promising students anonymity increased disclosure; 85% of the subjects disclosed information. The results indicate that failure to heed requests for confidentiality may be a widespread problem in college subject pools.

Cognitive–emotional distinctiveness: Separating emotions from non-emotions in the representation of a stressful memory

Current theories on autobiographical memory and recent neurological evidence suggest that emotional and non-emotional features of a memory may be retrieved by separate systems. To test this notion, 207 participants who had experienced the break-up of a significant romantic relationship in the last 12 months completed a Multidimensional Scaling (MDS) procedure in relation to the previous relationship. The resulting MDS model revealed two dimensions: a valence and an emotional/non-emotional dimension. Further, participants who associated a high level of distress with their relationship break-up perceived less dissimilarity between emotional and non-emotional features than participants who associated a low level of distress with their relationship break-up. Theoretical and methodological implications for stress and memory are discussed.