Suicidal ideation and attitudes toward suicide

Although hopelessness and depression are known risk factors for suicide, most individuals who are hopeless or depressed never make a suicide attempt. In this study, we tested the hypothesis that college students' (n = 230) attitudes toward suicide (the degree to which they see it as an acceptable option under some circumstances) would moderate the link between both hopelessness and depressive symptoms and their levels of suicidal ideation. This moderation hypothesis was supported, but only among men. Specifically, among men, levels of hopelessness and depressive symptoms were significantly related to suicidal ideation among only those with relatively positive attitudes toward suicide.     

Chronic stress impairs recall of extinction of conditioned fear

Chronic restraint stress produces retraction of apical dendrites of pyramidal neurons in medial prefrontal cortex. To begin to examine the functional significance of this dendritic reorganization, we assessed the effects of chronic restraint stress on a prefrontally mediated behavior, extinction of conditioned fear. After bar press training to obtain a baseline of activity against which to measure freezing, rats were either unstressed or stressed via placement in a plastic restrainer (3 h/day for 1 week). After an additional day of bar press training, rats underwent fear conditioning and extinction. Rats received five habituation trials to a 30-s tone (4.5 kHz, 80 db) followed by seven pairings of tone and footshock (500 ms, 0.5 mA). One hour later, rats received tone-alone extinction trials to criterion. The next day, rats received 15 additional extinction trials. Percent freezing was assessed during all phases of training. Stress did not significantly affect unconditioned responding to tone, acquisition of conditioned fear, or initial extinction, but significantly increased freezing on extinction day 2. Thus, consistent with the regressive dendritic changes seen in medial prefrontal cortex, one week of restraint stress specifically impaired recall of extinction, a pattern of deficits typical of animals with impaired medial prefrontal function.     

The influence of exploration mode, orientation, and configuration on the haptic Müller-Lyer illusion

We studied the impact of manner of exploration, orientation, spatial position, and configuration on the haptic Müller-Lyer illusion. Blindfolded sighted subjects felt raised-line Müller-Lyer and control stimuli. The stimuli were felt by tracing with the index finger, free exploration, grasping with the index finger and thumb, or by measuring with the use of any two or more fingers. For haptic judgments of extent a sliding tangible ruler was used. The illusion was present in all exploration conditions, with overestimation of the wings-out compared to wings-in stimuli. Tracing with the index finger reduced the magnitude of the illusion. However, tracing and grasping induced an overall underestimation of size. The illusion was greatly attenuated when stimuli were felt with the index fingers of both hands. Illusory misperception was not altered by the position in space of the Müller-Lyer stimuli. No effects of changes in the thickness of the line shaft were found, but there were effects of the length of the wing endings for the smaller, 5.1 cm stimuli. The theoretical and practical implications of the results are discussed.     

Task switching mediates the attentional blink even without backward masking

When two targets are presented in rapid succession, perception of the second target is impaired at short intertarget lags (100-700 msec). This attentional blink (AB) is thought to occur only when the second target is backward masked. To the contrary, we show that task switching between the targets can produce an AB even without masking (Experiments 1 and 3). Further, we show that task switching produces an AB only when the second target does not belong to a class of overlearned stimuli such as letters or digits (Experiments 1 and 4). When the second target is masked, however, an AB is invariably obtained regardless of switching or overlearning. We propose that task switching involves a time-consuming process of reconfiguration of the visual system, during which the representation of the second target decays beyond recognition, resulting in an AB deficit. We suggest that overlearned stimuli are encoded in a form that, while maskable, decays relatively slowly, thus outlasting the delay due to reconfiguration and avoiding the AB deficit.     

Focal distraction: spatial shifts of attentional focus are not required for contingent capture

Contingent capture occurs when distractors that share the target's defining attribute capture attention and slow down target identification. This slowdown has been attributed to an involuntary attentional shift to the location of a pertinent distractor. The present study examined an additional source of delay: the time spent in processing pertinent distractors. In 7 experiments, distractors were presented at fixation, and targets were presented either at fixation or peripherally. Contingent capture invariably occurred when a salient distractor was presented within about 600 ms before the target, even when spatial shifts in attentional focus were ruled out. A 2-stage model is proposed in which stimuli must pass an input filter tuned to the target's defining attribute before gaining access to a high-level stage that is unavailable while a distractor is being processed.     

Latent class analysis of college women's motivations for engaging in same-sex performativity

Same-sex performativity (SSP), or public performances of sexuality (e.g., kissing) between women who identify as heterosexual, is a relatively common relational experience among college-aged women. Identifying patterns of women's motivations for engaging in SSP can elucidate the heterogeneity among women's social and sexual behaviors during a critical developmental period (i.e., college). We used latent class analysis to identify classes of heterosexual undergraduate women who engaged in SSP (N = 282). We identified three classes of motivational patterns: Other-Motivated (i.e., notably motivated by male attention, wanting to shock others, wanting to bond, and social pressure), Ambiguously Motivated (i.e., most motivated by alcohol and fun, but minimally motivated overall), and Sexually Motivated (i.e., notably motivated by sexual desire and sexual experimentation). We then examined how class membership was associated with variables related to participants' evaluation of their SSP experience, self and identity, sexuality, and heterosexism. Classes significantly differed in SSP evaluations, as well as in certain facets of self and identity and sexuality (i.e., sorority membership and same-sex desire). These data provide evidence of substantial complexity in the characterizations of women who engage in SSP. We discuss the implications of the relationship between motivational patterns and women's evaluations of the SSP experience.     

A multisystems analysis of adolescent suicide attempters

The present study tested an ecologically based model, which predicted that hopelessness (individual level) mediates the effects of family dysfunction (interpersonal level) and socioeconomic status (sociocultural level) on both suicidal intent and suicidal ideation, within a sample of attempters. Subjects included adolescent males and females presenting at a general hospital emergency room following suicide attempts. Baron and Kenny's (1986) criteria for testing mediation models through multiple-regression analyses were employed. Little evidence of mediation was found. Hopelessness proved to be the best predictor of suicidal intent and ideation within a sample of attempters.     

The will and the ways: development and validation of an individual-differences measure of hope

Defining hope as a cognitive set that is composed of a reciprocally derived sense of successful (a) agency (goal-directed determination) and (b) pathways (planning of ways to meet goals), an individual-differences measure is developed. Studies demonstrate acceptable internal consistency and test-retest reliability, and the factor structure identifies the agency and pathways components of the Hope Scale. Convergent and discriminant validity are documented, along with evidence suggesting that Hope Scale scores augmented the prediction of goal-related activities and coping strategies beyond other self-report measures. Construct validational support is provided in regard to predicted goal-setting behaviors; moreover, the hypothesized goal appraisal processes that accompany the various levels of hope are corroborated.     

When do errors in reinforcer delivery affect learning? A parametric analysis of treatment integrity

Treatment integrity is the extent to which components of an intervention are implemented as intended (Gresham, 1989). Recent behavior-analytic literature has begun to evaluate the effects of reduced-treatment integrity on the efficacy and efficiency of skill-acquisition interventions. This study extended the current literature on the effects of errors of omission and commission of reinforcer delivery by replicating and extending Hirst and DiGennaro Reed (2015). Using a randomized-control group design, we compared undergraduate student participants' acquisition of conditional discriminations in a parametric analysis of different error values. A computer program erred in reinforcer delivery on 0%, 5%, 10%, 15%, 20%, 25% and 50% of trials. The purpose of the current study was to identify which levels of reduced integrity slowed or prevented acquisition. Our data replicated the findings of Hirst and DiGennaro Reed, and extended parametric analyses by identifying that errors in reinforcer delivery occurring on 15% or fewer trials (i.e., 85% integrity) were unlikely to prevent participants' responding from meeting the mastery criterion. These results could inform future research on how treatment-integrity errors change behavior-analytic procedures and the effects on skill acquisition for consumers of applied behavior analysis.     

“Sasaengpaen” or K-pop Fan? Singapore Youths,Authentic Identities,and Asian Media Fandom

Since the late 1990s, the Korean pop-culture wave has had a huge impact, achieving immense popularity and sustaining a global community of consumers and fans. In Singapore, a significant K-pop fan culture has emerged among youths. In this article, we study the emergence of the sasaeng fan—a stigmatized fan identity that refers to individuals who are unhealthily interested in the personal lives of K-pop idols. Drawing on data from mass and social media, participant-observation, and interviews, we map the significance of the sasaeng fan identity for Singapore K-pop music fans and focus specific attention on how fans negotiate an understanding of their own “authentic” identities vis-à-vis the mediated identity of the sasaeng fan.