The effect of subliminal priming on sleep duration

Two experiments primed college students with either sleep‐related or neutral words and then assessed sleep during a 25 minute nap period. Both experiments showed that participants primed with sleep‐related words reported having slept longer than did those primed with neutral words. Furthermore, both experiments showed that sleep‐primed participants exhibited lower heart rate. Experiment 2 also revealed that the effect of the priming manipulation was especially strong among participants who had trouble sleeping. This suggests that priming might be a cost‐effective treatment for inducing sleep among people with sleep problems.     

A role for affect in the link between episodic simulation and prosociality

Prospection and prosociality are hallmarks of our species. Little is known, however, about how our ability to imagine or simulate specific future events contributes to our capacity for prosociality. Here, we investigated this relationship, revealing how the affective response that arises from a simulated prosocial event motivates a willingness to help a person in need. Across two experiments, people reported being more willing to help in specific situations after simulating future helping events that elicited positive (versus negative or neutral) affect. Positive affect increased engagement of theory of mind for the person in need, which in turn informed prosocial responses. Moreover, the subjective experience of scene imagery and theory of mind systematically couple together depending on the affective valence of future simulations, providing new insight into how affective valence guides a prosocial function of episodic simulation.     

Mental control and visual illusions: Toward explaining race-biased weapon misidentifications

People are biased to misidentify harmless objects as weapons when the objects are associated with African Americans (Payne, 2001). Two studies examined the processes underlying this bias. The illusory perception hypothesis argues that stereotypes alter the subjective construal of the object. In contrast, the executive failure hypothesis argues that even when perception of the item is intact, misidentifications can result from failures to control responses. Immediately after making an error, participants were able to accurately express that they had made a mistake via confidence ratings (Experiment 1) and by correcting their judgment (Experiment 2). Subjective confidence judgments were extremely well calibrated to accuracy, and participants virtually never believed their own mistakes. Conditions likely to create errors through both illusions and control failures are discussed.     

Differential Daily Writing Conditions and Performance on Major Multiple-Choice Exams

Students (N=153) in three equivalent sections of an undergraduate human development course compared pairs of related concepts via either written or oral discussion at the beginning of most class sessions. A writing-for-random-credit section achieved significantly higher ratings on the writing activities than did a writing-for-no-credit section. The writing-for-random-credit section also obtained significantly higher correlations between the writing ratings and scores on multiple-choice exam items related to the conceptual pairs (r=.74) and on total exam scores (r=.78) than did the writing-for-no-credit section (rs=.45 and .43, respectively). Finally, the writing-for-random-credit condition produced significantly higher scores on exam items related to the conceptual pairs than did the oral-discussion-only condition. Plus, effect-size comparisons showed weak to medium differences between exam scores under the writing-for-random-credit and the writing-for-no-credit condition.     

Improved Perceptions of Emotion Regulation and Reflective Functioning in Parents: Two Additional Positive Outcomes of Parent-Child Interaction Therapy

The purpose of this study was to test whether Parent-Child Interaction Therapy (PCIT), a widely used effective therapy for children’s externalizing behaviors and parenting problems, was associated with improvements in parents’ emotion regulation and reflective functioning. We also investigated whether these improvements had unique associations with children’s improvements in externalizing and internalizing symptoms. Participants were 139 Australian children aged 29 to 83 months and their caregivers; all were referred for child externalizing behavior problems coupled with parenting skill deficits or high parent stress. All data were gathered via a questionnaire completed prior to and after completion of PCIT. Significant improvements were found in parents’ self-reported emotion dysregulation and capacity to use cognitive reappraisal for emotion regulation. There was also improvement in parents’ self-report of children’s symptoms, parenting practices, and reflective functioning in the form of prementalizing, which measured a low capacity to understand the emotional world of the child. Multiple regression showed that improvements in cognitive reappraisal, prementalizing, and negative parenting practices were associated with improvement in children’s symptoms. The findings extend the existing evidence for PCIT as an effective parenting intervention, adding parents’ perceived emotion regulation and reflective functioning to the list of positive outcomes from PCIT. Improved emotion regulation and reflective functioning, unique from changes in parenting practices, could be mechanisms that help explain why PCIT has been associated with improvements in children’s externalizing behaviors.     

The Role of Individual Factors in Friendship Formation: Considering Shyness,Self‐Esteem,Social Skills,and Defensive Pessimism

The purpose of this study was to examine the effects of four individual factors (shyness, self‐esteem, social skills, and defensive pessimism) on the formation of friendships among undergraduate students. Freshmen (N = 93) completed a questionnaire assessing their shyness, self‐esteem, social skills, and level of defensive pessimism. Then, they answered questions about interpersonal indices (number of friends, satisfaction with friendships, their willingness to continue relationships, and their feelings of interpersonal friction). After 3 months, they completed a questionnaire about their anxiety state and behavior when talking with the people they had met since university admission. Moreover, they discussed the interpersonal indices they used in a pre‐questionnaire. Path analysis indicated that shyness directly leads to having fewer friends, whereas social skills lead to having more friends through extroversive behavior. Moreover, self‐esteem was positively related to an increase in the willingness to continue relationships, and reflection and pessimistic thinking (which is one component of defensive pessimism) led to a feeling of being fatigued from the effort of considering and respecting the reactions of others.     

Ageism in Mental Health and Health Care: A Critical Review

Discussions of aging and mental health widely assume that ageism among mental health providers is an important factor limiting access to mental health services for older adults. Given the widespread citation of ageism as a problem, we critically review the history of the ageism construct, and evidence for its existence in both mental health and medical professionals. There is surprisingly little empirical evidence for age bias among mental health providers. Considerable evidence does suggest differential medical treatment for older adults in such diverse areas as physician–patient interaction, use of screening procedures, and treatment of varied medical problems, although it is unclear whether age bias accounts for these differences. We suggest that innovations in delivery of psychological services, such as collaborative medical/psychological care in primary care settings, may ultimately prove more useful in improving access to mental health services than efforts to combat ageism.     

Measuring keyboard response delays by comparing keyboard and joystick inputs

The response characteristics of PC keyboards have to be identified when they are used as response devices in psychological experiments. In the past, the proposed method has been to check the characteristics independently by means of external measurement equipment. However, with the availability of different PC models and the rapid pace of model change, there is an urgent need for the development of convenient and accurate methods of checking. The method proposed here consists of raising the precision of the PC’s clock to the microsecond level and using a joystick connected to the MIDI terminal of a sound board to give the PC an independent timing function. Statistical processing of the data provided by this method makes it possible to estimate accurately the keyboard scanning interval time and the average keyboard delay time. The results showed that measured keyboard delay times varied from 11 to 73 msec, depending on the keyboard model, with most values being less than 30 msec.     

Probability Distortions and Outcome Desirability: Experimental Verification of Medical Folklore1

A belief common among medical personnel is that in conveying diagnoses or prognoses to patients, it is always best to emphasize the positive. In order to see if emphasis on the positive does make a difference in one's expectation of the more desirable of two alternative outcomes actually occurring, this laboratory experiment was conducted. College students were led to believe they had a low, moderate, or high probability of being assigned to one of two tasks, which differed in desirability. For some students the instructions focused on the probability of being assigned to the desirable task, whereas for others the instructions focused on the probability of being assigned to the undesirable. The two probabilities were always complementary; that is, the probability of being assigned to the desirable task was equal to one minus the probability of being assigned to the undesirable task. Following an interpolated activity, each subject's expectation of being assigned to the desirable or undesirable task was measured. Across all probability levels, subjects for whom the instructions had focused on the probability of being assigned to the desirable task viewed that assignment as significantly more likely than did subjects for whom the instructions had focused on the complementary probability of being assigned to the undesirable task. The implications of this for communicating with patients, for preventive medicine, and for coping with serious illness are briefly discussed.     

Stimulus and response contributions to the children's reaction-time repetition effect

Adults and 8-, 10-, 12-, and 14-year olds completed a serial reaction-time task with two stimuli mapped to each of two responses and 100-, 500-, and 1000-msec response-stimulus intervals (RSIs). Trials were classified as (1) identical (same stimulus and same response on two consecutive trials), (2) response equivalent (different stimulus but same response on two consecutive trials), or (3) different (different stimulus and different response on two consecutive trials). Identical and different trials were compared as a general indication of repetition effects. Response-equivalent minus identical reaction time identified stimulus contributions, and different minus response-equivalent reaction time identified response contributions. Adults received a repetition advantage at all RSIs and children received a repetition advantage at 500- and 1000- but not 100-msec RSIs. Stimulus contributions accounted for the repetition effect for both adults and children. At the 500- and 1000-msec RSIs, both the overall repetition effect and stimulus contribution were positive and decreased in magnitude as age increased. The response contribution was independent of RSI and was negative for 8- and 10-year-olds and near zero or positive for older performers. At the longer RSIs, positive stimulus contributions were sufficient to overcome the negative response contributions present for younger children.