Researchers misunderstand confidence intervals and standard error bars

Little is known about researchers' understanding of confidence intervals (CIs) and standard error (SE) bars. Authors of journal articles in psychology, behavioral neuroscience, and medicine were invited to visit a Web site where they adjusted a figure until they judged 2 means, with error bars, to be just statistically significantly different (p < .05). Results from 473 respondents suggest that many leading researchers have severe misconceptions about how error bars relate to statistical significance, do not adequately distinguish CIs and SE bars, and do not appreciate the importance of whether the 2 means are independent or come from a repeated measures design. Better guidelines for researchers and less ambiguous graphical conventions are needed before the advantages of CIs for research communication can be realized.     

A life history assessment of early childhood sexual abuse in women

Life history theory provided a framework for examining the relations among child sexual abuse (CSA), childhood adversity, and patterns of reproductive development and behavior. A community survey that assessed CSA, life history variables (e.g., age of menarche), and social and family background was administered to 623 women (mean age=26.9 years). Independent of social and family background, CSA was associated with earlier age of (a) menarche, (b) first sexual relationship, (c) desire to have children, (d) first childbirth, and (e) lower self-evaluated physical attractiveness. Cluster analyses revealed different patterns of experiential correlates of reproductive development within the group of abused women, suggesting CSA may operate in combination with other childhood circumstances to modify the timing and pattern of individual maturation.     

Communication and social skills in socially anxious and nonanxious individuals in the context of romantic relationships

This study examined differences between socially anxious and nonanxious individuals' ability to use effective communication skills and social skills in the context of romantic relationships. Socially anxious (n = 13) and nonanxious (n = 14) individuals and their romantic partners were videotaped while participating in 10-minute neutral, negative, and pleasant conversations. Regardless of the type of conversation in which they were involved, socially anxious individuals demonstrated impairment in 10 of the 11 social skill variables assessed. In negative conversations, socially anxious individuals displayed more "very negative" behaviors than nonanxious individuals, and across all conversations they displayed fewer "positive" behaviors than nonanxious individuals. Partners of socially anxious and nonanxious individuals did not differ in their communication quality. The results suggest that social anxiety is associated with deficits in relationship maintenance behavior and call for the completion of a larger study examining the interpersonal consequences of social anxiety.     

Thought suppression mediates the relationship between negative affect and borderline personality disorder symptoms

The purpose of this study was to examine the relationships among negative affect, childhood sexual abuse (CSA), thought suppression, and diagnostic symptoms of borderline personality disorder (BPD) in a community sample (n=127). Findings suggest that the temperamental variable negative affect intensity/reactivity was a stronger predictor of BPD symptoms than CSA. In addition, results indicated that higher thought suppression mediated the relationship between negative affective intensity/reactivity and BPD symptoms, after controlling for a history of CSA. Overall, findings suggest that (a) negative affectivity may be a better predictor of BPD symptoms than CSA, and (b) chronic efforts to suppress unpleasant thoughts may be a regulation strategy underlying the relationship between intense negative emotions and BPD symptoms.     

Measuring automatic retrieval: a comparison of implicit memory, process dissociation, and speeded response procedures

Using the stem completion task, we compared estimates of automatic retrieval from an implicit memory task, the process dissociation procedure, and the speeded response procedure. Two standard manipulations were employed. In Experiment 1, a depth of processing effect was found on automatic retrieval using the speeded response procedure although this effect was substantially reduced in Experiment 2 when lexical processing was required of all words. In Experiment 3, the speeded response procedure showed an advantage of full versus divided attention at study on automatic retrieval. An implicit condition showed parallel effects in each study, suggesting that implicit stem completion may normally provide a good estimate of automatic retrieval. Also, we replicated earlier findings from the process dissociation procedure, but estimates of automatic retrieval from this procedure were consistently lower than those from the speeded response procedure, except when conscious retrieval was relatively low. We discuss several factors that may contribute to the conflicting outcomes, including the evidence for theoretical assumptions and criterial task differences between implicit and explicit tests.     

The nature of change detection and online representations of scenes

This article provides evidence for implicit change detection and for the contribution of multiple memory sources to online representations. Multiple eye-movement measures distinguished original from changed scenes, even when college students had no conscious awareness for the change. Patients with amnesia showed a systematic deficit on 1 class of eye-movement measures of change detection, even though conscious awareness was not required for the effect to be observed. The authors' findings suggest that online representations of scenes are (a) built up across viewings, (b) composed of activated information from both long-term and working memory, and (c) directly compared with currently processed information regarding the external world. Subsequent online processing is influenced by these representations even when the results of the comparison are not accessible for verbal report.     

Self-fulfilling prophecies: the synergistic accumulative effect of parents' beliefs on children's drinking behavior

This research examined whether mothers' and fathers' beliefs about their children's alcohol use had cumulative self-fulfilling effects on their children's future drinking behavior. Analyses of longitudinal data acquired from 115 seventh-grade children and their mothers and fathers were consistent with synergistic accumulation effects for negative beliefs: Parents' beliefs predicted the greatest degree of confirmatory behavior from children when both mothers and fathers overestimated their children's alcohol use. Results did not support synergistic accumulation effects for positive beliefs: Children's predicted future alcohol use was similar regardless of whether one parent or both underestimated their child's alcohol use. These findings suggest that the generally small self-fulfilling effects reported in the literature may underestimate the power of negative self-fulfilling prophecies to harm targets because studies have not taken into consideration the possibility that negative self-fulfilling prophecies may be more likely than positive ones to accumulate across multiple perceivers.     

From vulnerability to resilience: learning orientations buffer contingent self-esteem from failure

An experiment examined the buffering effects of a learning orientation following failure in a domain of contingent self-worth. Participants' academic contingencies of self-worth (CSW) and priming with theories of intelligence interacted to affect vulnerability of self-esteem to failure. Participants who had high academic CSW and were primed with an entity theory of intelligence experienced lower self-esteem and higher negative affect following failure than following success on an academic test, but these effects were eliminated when participants with high academic CSW were primed with an incremental theory of intelligence. This study shows that endorsing a learning orientation is an effective way to minimize threat to self-esteem among students whose self-worth is highly contingent on academics and may allow them to persist in the face of challenges and to learn from failure.     

When do leotards get their spots? Semantic activation of lexical neighbors in visual word recognition

Shadowing and priming studies have provided strong evidence that during spoken word recognition, the meanings of different words that share their onset (e.g., captain and captive) are activated in parallel. In contrast, for visual word recognition, there is little evidence that the meanings of visually similar words are activated in parallel. This is consistent with the idea that for reading (in contrast to listening), since all the sensory information necessary to identify a word is available at once, any competition between visually similar words is resolved before their meanings are retrieved. However, Forster and Hector (2002) have recently shown that for nonwords (e.g., turple), some aspect of the meanings of lexical neighbors (e.g., turtle) can be activated. However, this finding is limited to non-words. The activation of turtle's meaning in response to turple may occur because turple has no meaning. In normal reading, we do not encounter nonwords, and there is strong pressure on the reading system to produce meaningful representations for every word (even misspelled words). The two semantic categorization experiments reported here extend this finding to real words. Participants are slower to decide that leotard is not an animal because of its animal neighbor leopard. This shows that information about a word's meaning can be available before it has been uniquely recognized.     

The fragile X mental retardation protein, FMRP, recognizes G-quartets

Fragile X mental retardation is a disease caused by the loss of function of a single RNA-binding protein, FMRP. Identifying the RNA targets recognized by FMRP is likely to reveal much about its functions in controlling some aspects of memory and behavior. Recent evidence suggests that one of the predominant RNA motifs recognized by the FMRP protein is an intramolecular G-quartet and that the RGG box of FMRP mediates this interaction. Searching databases of mRNA sequence information, as well as compiled sequences of predicted FMRP targets based on biochemical identification, has revealed that many of these predicted FMRP targets contain intramolecular G-quartets. Interestingly, many of the G-quartet containing RNA targets encode proteins involved in neuronal development and synaptic function. Defects in the metabolism of this set of RNAs, presumably in the translation of their protein products, is likely to underlie the behavioral and cognitive changes seen in the disease.