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Working Memory and Tongue Twisters03/11/2015In the visual tongue twister effect, readers take longer to silently read sentences with repeated word-initial phonemes (Twenty toys were in the trunk) than sentence with a normal mixture of word-initial phonemes (Several games were in the chest) (McCutchen & Perfetti, 1982). The explanation of this effect is that when words are identified during reading, they are held in a working memory buffer. The first phoneme of each word is used as a marker to differentiate them. When all of the phonemes are the same, it becomes difficult to differentiate each word, thus tongue twisters take longer to read silently than neutral sentences. Although this explanation sounds plausible, there has been no research yet to test the hypothesis that the visual tongue twister effect is caused by confusion in working memory. The current study tested this hypothesis to determine if working memory is really related to the visual tongue twister effect. Participants read 40 sentences with repeated phonemes (tongue twister) and 40 sentences with no repeated phonemes (neutral) and completed a working memory task. Tongue twister sentences were paired with neutral sentences and controlled for syntactic structure, reading difficulty, and semantic similarity. Participants with low working memory capacity were more affected by the tongue twister sentences than readers with high working memory capacity. This result indicates that working memory plays an important role during reading. The results support the theory that word-initial phonemes serve to differentiate words that are held in a working memory buffer. |
Working Memory and the Correction of Misinformation in News Reports03/11/2015Initial misinformation in news reports can continue to influence readers’ judgments and inferences even after a correction has been provided (Lewandowsky et al., 2012). Successful correction is cognitively demanding; readers must extract the implications of the correction and inhibit reliance on the misinformation. Hence, we assessed whether the effectiveness of a correction at reducing reliance on misinformation is associated with working memory. Participants recruited online read a news story containing misinformation that was later either corrected or not depending upon condition. Reliance on the misinformation was assessed by examining how often participants answered open-ended questions with inferences based on the misinformation. Consistent with past findings, we expected that No Correction participants would provide more inferences consistent with the misinformation than Correction participants. To measure working memory, participants completed a 2-back task where they had to determine whether the current letter in a continuous stream of letters matched the letter two previous. The total inferences generated were modeled using a regression with Correction condition, 2-back performance, and the interaction as predictors. As expected, performance on the 2-back task was a significant moderator of the relationship between Correction and total inferences generated such that better 2-back performance was associated with a greater reduction in inferences following Correction. The present study provides evidence that ability to correct misinformation encountered in a news story is moderated by working memory. |
Traumatic Stress Exposure While Under the Influence of Alcohol: Findings in an Undergraduate Sample03/11/2015Research has well-documented the relationship between posttraumatic stress disorder (PTSD) and substance use following a traumatic event. However, few studies have examined the development of PTSD in survivors who are under the influence of substances during the traumatic event. The current literature boasts mixed results; some studies find sexual assault survivors under the influence of alcohol report fewer PTSD symptoms, while other studies show survivors demonstrate higher levels of PTSD symptoms subsequent to the trauma exposure. The current study examined whether alcohol use at the time of a sexual assault or other type of trauma was associated with severity of PTSD symptoms in 1045 Kent State undergraduate students. Through anonymous online testing, participants completed the Posttraumatic Stress Diagnostic Scale (PDS), to screen and assess for the severity of PTSD symptoms and substance use at the time of the trauma. Univariate analysis of variance revealed that for all surveyed trauma types, alcohol use at the time of the trauma was associated with increased severity of PTSD symptoms (p < .001). When investigating only interpersonal types of trauma, reports of alcohol use at the time of trauma did not have a significant effect on PTSD symptoms (p = .533). The findings underscore the need to further examine the relationship between trauma exposure and PTSD when victims are under the influence of alcohol. |
The Relationship between Perfectionism and Quality and Timeliness of Work03/11/2015Perfectionism is defined as the degree to which we strive for perfection. In the scientific literature this enigmatic personality trait is viewed as both good and bad. Perfectionism has been found to be a sub-factor of Conscientiousness, which is closely associated with work performance and leadership (Howard and Howard, 2001). In medical and psychological literature it is often associated with maladaptive behavior (Pacht, 1984). Perfectionism is often associated with setting unrealistic goals and feelings of failure and worthlessness. This is particularly true in research in the formulation of self-concept and the development of relationships with others. However, there is little research on the relationship of perfectionism to human performance in an organizational context. The present study looks at the relationship between perfectionism and quality, timeliness of work, performance related competencies and overall work performance. Claims supervisors from a large Midwest-based insurance company were assessed a Big Five Personality Theory instrument which includes a subscale measuring perfectionism. Manager ratings of performance and measures of quality and timeliness of case closings based on independent audits were also collected. The data was analyzed using both linear and non-parametric techniques. The results show the complex relationship between this trait and performance and relationships at work. The study makes recommendations for the future research of this trait and human performance. |
The Power of Belief and its Effects on Health03/11/2015Prior studies have suggested that members of different religions have better mental and physical health than those who identify as “religious-none”. However, the potential differences between groups based on whether they simply believe in a higher power or not (or are not sure) has not gotten much attention. The present study examines the differences in self-reported mental and physical health between those who identify as atheist, agnostic and theist. 3,695 participants completed a short questionnaire online, assessing their mental and physical health. An analysis of variance (ANOVA) test showed that overall (on the mental and physical health constructs combined) there was a significant difference between groups (F [2, 3692] = 3.985 p < .05). A post hoc Tukey test (p < .05) showed that theists scored significantly higher than agnostics overall. Contrary to expectations, atheists scored between the two: being neither significantly higher than agnostics nor significantly lower than theists. These results may give a new perspective on the relationships between belief and health. Specifically, the current results show that certainty of belief (or nonbelief) on either side of the spectrum might be associated with higher levels of physical and mental health. |
The NMDA receptor antagonist MK-801 renders reconsolidation of passive-avoidance state-dependent.03/11/2015Memory reconsolidation refers to the process by which a memory is reactivated or retrieved, that information then becomes malleable and must undergo re-storage as the memory is updated. State-dependent memory is evident when there is a mismatch in the cues associated with a memory between learning or storage and retrieval. In Experiment 1a we showed that MK-801, an NMDA receptor antagonist, impaired memory for reconsolidation. Experiment 1b replicated previous work by showing that MK-801 administered peripherally in rats produced state dependent memory for passive avoidance (Flint, Noble, & Ulmen, 2013). In Experiment 2 rats received intracerebroventricular (icv) cannula implants into the left lateral ventricle. In Experiment 3 rats received bilateral dorsal hippocampal cannula implants. All rats were trained in passive-avoidance and, 48 hours later, given a reactivation of the training via exposure to the passive avoidance chamber. Immediately following reactivation, animals were infused with either MK-801 or saline. Then, 48 hours after reactivation and 10 minutes prior to test, animals were infused with MK-801 or saline and tested. The data suggests that MK-801 produced state-dependent reconsolidation for passive-avoidance when given peripherally and centrally via icv and dorsal hippocample infusions. |
The Moderating Role of Attachment Style in the Associations between Work-Home Interference, Relationship Satisfaction, and Job Satisfaction03/11/2015Work-home interference is increasing due to challenges in balancing the demands of home and work environments. Yet, certain individuals are more susceptible to interference than others. We predicted that individuals’ attachment styles would influence the effects of work-home interference on relationship and job satisfaction. Participants (N = 150) completed online questionnaires measuring relationship satisfaction, job satisfaction, perceived work-home interference, and attachment styles. We examined the associations between work-home interference and relationship/job satisfaction, and attachment styles as moderators of these associations using regression analysis. Results indicated significant negative main effects of attachment avoidance on relationship satisfaction, and work-to-home interference on job satisfaction. Contrary to our predictions, attachment styles did not moderate the effects of work-home interference on job and relationship satisfaction. Although results indicate associations between attachment styles and relationship satisfaction, as well as work-home interference and job satisfaction, it is unclear how individual differences influence the effects of work-home interference. |
The Mediating Effects of Smoking on the Relationship between Posttraumatic Stress Disorder (PTSD) and PTSD-related Sleep Disturbances03/11/2015PTSD rates in the United States are an estimated 7-9%. PTSD is associated with a variety of negative health behaviors and consequences, including sleep disturbances. Studies show that 70-87% of individuals with PTSD will report poor sleep quality, a 48-60% increase from those without PTSD. Another consequence that is commonly associated with PTSD is smoking addiction. Individuals with PTSD have 2 to 4 times the risk of smoking addiction than those without PTSD. Furthermore, sleep disturbances and smoking are commonly related, as significantly more smokers than non-smokers (28.1% compared to 19.1%) demonstrate disturbed sleep quality. Moreover, higher degrees of nicotine dependence are associated with shorter sleep duration. The current study examines the relationship between PTSD symptoms (PTSS), smoking addiction, and sleep disturbances in a sample of 659 college students. Results from a mediation analysis with 10,000 bootstrapped resamples indicated that smoking addiction mediated the relationship between PTSS and sleep disturbances [F(1, 637) = 13.88, p = |
The Acute Effects of High-Intensity Interval Training (HIIT) versus Endurance Training Interventions on Transient Mood and Cognitive Performance following a Stressful Event03/11/2015Problem: Aerobic exercise reduces stress; however, the differential effects of specific types of exercise are unclear. We compared the effects of two types of exercise (high-intensity interval training; HIIT and endurance training; ET) versus a control condition on mood and cognition following a stressor. Methods: Participants were healthy undergraduates (aged 18-25). Physiological tests (e.g., heart rate; HR) were administered, followed by psychological tests (e.g., Profile of Moods States; POMS, and Automated Neuropsychological Assessment Metrics; ANAM ). Participants completed a public-speaking/negative mood-induction task, and were then randomly assigned to complete one of three interventions. Physiological and psychological tests were then re-administered. Expected Results: We predict the two forms of aerobic exercise will have independent effects on mood and cognition though data collection is still ongoing. Conclusions: Our results will inform whether certain types of aerobic exercise differentially impact mood and cognition and may inform the development of exercise-based interventions for stress. |
Sex differences in memory precision following a pre-test cue in mice, but not rats.03/11/2015Immediately following a disturbing experience, specific contextual cues associated with the experience can elicit the initial unpleasant reaction (e.g., fear). Over time, cues that are similar, but not identical, to the original associated cues can also instigate an aversive response. This phenomenon is known as context generalization, a pathological form of which is frequently a symptom of anxiety disorders such as social anxiety and post-traumatic stress disorder. In order to advance understanding of the pathologies underlying these anxiety disorders, we sought to identify means to re-establish context specificity and reduce fear generalization. Mice and rats were trained in context fear conditioning, and tested at a long interval with or without exposure to the training context. We demonstrated that fear generalization was reduced through a re-exposure to the training context in rats, but not in mice. Our data indicate fear generalization was reduced in both male and female rats. However, fear generalization was only reduced in male mice, but not in females. As females are more susceptible to anxiety disorders, understanding the sex difference in fear generalization is crucial to determining sex-specific treatments for anxiety disorders. |