Psychophysical investigation of vigilance decrement in jumping spiders: overstimulation or understimulation?

The inability to maintain signal detection performance with time on task, or vigilance decrement, is widely studied in people because of its profound implications on attention-demanding tasks over sustained periods of time (e.g., air-traffic control). According to the resource depletion (overload) theory, a faster decrement is expected in tasks that are cognitively demanding or overstimulating, while the underload theory predicts steeper decrements in tasks that provide too little cognitive load, or understimulation. Using Trite planiceps, a jumping spider which is an active visual hunter, we investigated vigilance decrement to repetitive visual stimuli. Spiders were tethered in front of two stimulus presentation monitors and were given a polystyrene ball to hold. Movement of this ball indicates an attempt to turn towards a visual stimulus presented to a pair of laterally facing (anterior lateral) eyes for closer investigation with high acuity forward-facing (anterior median) eyes. Vigilance decrement is easily measured, as moving visual stimuli trigger clear optokinetic responses. We manipulated task difficulty by varying the contrast of the stimulus and the degree of ‘noise’ displayed on the screen over which the stimulus moved, thus affecting the signal:noise ratio. Additionally, we manipulated motivation by paired testing of hungry and sated spiders. All factors affected the vigilance decrement, but the key variable affecting decrement was stimulus contrast. Spiders exhibited a steeper decrement in the harder tasks, aligning with the resource depletion theory.     

Construction of a more coherent story: Prior verbal recall predicts later verbal accessibility of early memories

The question of whether early event memories are later accessible for verbal report is of major interest to those concerned with mnemonic processes. In a controlled laboratory study, we examined this question in children 16 and 20 months of age at the time of exposure to event sequences in the context of an elicited-imitation paradigm and who were subsequently tested for memory for the events at delays of 1, 3, 6, 9, or 12 months, and again at the age of 36 months. Stepwise regressions revealed that the number of mnemonic utterances elicited by direct interview at 36 months is predicted by the number of spontaneous mnemonic utterances at the first delayed recall session. Language abilities at exposure were not predictive of verbal report at 36 months of age. Thus, variables from the most recent exposure were of more import than were variables from the time of the initial experience of the events.     

Coping as a mediator of the impact of sociocultural factors on health behavior among HIV-positive latino gay men

In a sample of 140 HIV-positive immigrant Latino gay men, we tested a mediational model of the impact of sociocultural factors (i.e., poverty, discrimination, and U.S. acculturation) on active engagement of health-promoting behaviors (i.e., practicing good health habits). The role of coping as a mediator was examined. We proposed that the experience of social discrimination, together with acculturation, has a negative influence on active coping, which in turn would impact health behaviors. Regression analyses supported the role of coping as a mediator between sociocultural factors (specifically discrimination based on race or ethnicity and acculturation to the U.S.) and health-promoting behaviors. Findings from this study contribute to explaining the way in which sociocultural factors impact health among those who are HIV-positive and most vulnerable in our society.     

The Coping Paradox: Work,Stress, and Coping in the U.S. Army

The military environment has unique stressors. This study investigates the types of stressors, appraisals, and coping responses of U.S. soldiers and their leaders. A qualitative analysis of interviews indicates that the traditional coping buffers of social drinking and seeking social support from fellow soldiers, family, and leaders can potentially serve as sources of stress. While this paradox may be a result of the unique types of stressors in the military work environment, these results should direct researchers to better understand individuals' perceptions and appraisals of stress, with a focus on the meaning of stress, given contextual factors inherent in the workplace. The findings are discussed in relation to the literature on the impact of stress on physical and psychological health.     

The Effect of Masculinity on Community Reintegration Following TBI in Military Veterans

The present study examined the effect of level of traditional masculine gender role norms as well as the moderating effect of cognitive flexibility on community reintegration outcomes in a sample of 60 male military veterans who had sustained a traumatic brain injury during deployment. Data were collected through self-report measures and cognitive tests. Results suggested that greater endorsement of traditional masculine gender role beliefs, attitudes, and behaviors was significantly inversely related to the community integration domains of relationships and living skills and not significantly related to work and leisure. The effect of masculinity on healthy living skills was moderated by cognitive flexibility; the protective effect of low masculinity on living skills was only present if the veteran also had high cognitive flexibility skills. Results are discussed in the context of gender role strain, potential limiting aspects of stereotypy on recovery and reintegration, and the importance of cognitive flexibility in the recovery/reintegration process.     

Tumor Locus Moderates Anxiety Symptoms in a Pediatric Neuro-Oncologic Sample

Despite the prevalence of pediatric Central Nervous System (CNS) solid tumors, little is understood about patients' disease-related anxiety experience. Data from 25 remitted pediatric CNS tumor patients posttreatment were collected. Significant symptoms of anxiety were reported by 32% of patients. MRI studies showed all anxious patients had right cortical tumors or left cerebellar tumors. Confound analyses suggest these results are not better accounted for by demographic, disease, or treatment variables. These results evidence the risk some pediatric neuro-oncologic patients face for developing significant anxiety symptoms.