Peck tracking: a method for localizing critical features within complex pictures for pigeons

The pigeon is a standard animal in comparative psychology and is frequently used to investigate visuocognitive functions. Nonetheless, the strategies that pigeons use to discriminate complex visual stimuli remain a difficult area of study. In search of a reliable method to identify features that control the discrimination behaviour, pecking location was tracked using touch screen technology in a people-absent/people-present discrimination task. The correct stimuli contained human figures anywhere on the picture, but the birds were not required to peck on that part. However, the stimuli were designed in a way that only the human figures contained distinguishing information. All pigeons focused their pecks on a subarea of the distinctive human figures, namely the heads. Removal of the heads significantly impaired performance, while removal of other distinctive parts did not. Thus, peck tracking reveals the location within a complex visual stimulus that controls discrimination behaviour, and might be a valuable tool to reveal the strategies pigeons apply in visual discrimination tasks.     

Women's Reactions to Miscarriage: The Role of Attributions,Coping Styles,and Knowledge1

This study examined 72 women's retrospectively reported reactions to miscarriage, including depression, stress, and anxiety. The buffering role of women's attributional explanations for the event, the significance of the loss of the baby, coping strategies, and women's knowledge of miscarriage were also assessed. Correlational analyses revealed that women's attributions were tied to their reactions, in that the more women blamed their own character or doctor, the more severely they reacted. Coping strategies accounted for a large portion of the variance (64%), whereby women who used cognitive restructuring as a strategy suffered less adverse reactions than did those who used social withdrawal or wishrul thinking. Women's knowledge before miscarriage, rather than after, accounted for 6% of the variance in their reactions. Examining the interrelations of these variables revealed that the amount of women's knowledge before miscarriage was related to less wishful thinking, and their knowledge after the event was related to less problem avoidance. Women's attributions were also related to their coping strategies: Blaming one's character, behavior, or doctor were positively related to self-criticism and social withdrawal, and negatively related to support from doctors and significant others. The implications of these findings for interventions to facilitate adjustment to miscarriage and future research are discussed.     

DOES FATHERS' PRENATAL MENTAL HEALTH BEAR A RELATIONSHIP TO PARENTING STRESS AT 6 MONTHS?

This study aimed to explore fathers’ mental health and retrospectively reported adverse childhood experiences during pregnancy, as well as various pathways predicting self‐reported stress at 6 months’ postpartum as assessed by the Parenting Stress Index (PSI; R.R. Abidin, 1990 ). A total of 835 fathers contributed data to the study. Data collection comprised five time points during pregnancy and one at 6 months’ postpartum. The main analyses were performed using linear regression and path analyses. First, linear regression analyses showed that paternal anxiety symptoms during pregnancy predicted stress scores in the PSI child domain at 6 months (coefficient = 0.36). Second, path analyses showed that depressive symptoms during pregnancy predicted parenting stress in the child domain, mediated by spousal disharmony at 6 months’ postpartum (coefficient = 0.77). Third, adverse childhood experiences scores predicted parenting stress in the child domain by two different pathways: one mediated by anxiety symptoms in pregnancy (coefficient = 0.29) and the other by depressive symptoms in pregnancy and experienced spousal disharmony at 6 months’ postpartum (coefficient = 0.77). The findings suggest that fathers’ symptoms of anxiety and depression during pregnancy as well as adverse childhood experiences predict paternal stress and a negative perception of their children's behavior at 6 months’ postpartum.     

Neurocognitive functioning in patients with conversion disorder/functional neurological disorder

Neurocognitive symptoms are common in individuals with somatic symptom and related disorders (SSRD), but little is known about the specific impairments in neurocognitive domains in patients with conversion disorder (CD)/functional neurological disorder (FND). This study examines neurocognitive functioning in patients with CD/FND compared to patients with other SSRD. The sample consisted of 318 patients. Twenty-nine patients were diagnosed with CD/FND, mean age 42.4, standard deviation (SD) = 13.8 years, 79.3% women, and 289 patients had other SSRD (mean age 42.1, SD = 13.3, 60.2% women). Patients completed a neuropsychological test battery that addressed a broad range of neurocognitive domains, including information processing speed, attention and executive functioning. Patients with CD/FND had clinically significant neurocognitive deficits in all neurocognitive domains based on normative data comparison. Patients with CD/FND also performed significantly worse than patients with other SSRD on information processing speed (Digit Symbol Substitution Test (V = .115, p = .035), Stroop Color–Word Test (SCWT) card 1 (V = .190, p = .006), and SCWT card 2 (V = .244, p < .001). No CD/FND vs. other SSRD differences were observed in other neurocognitive domains. These findings indicate the patients with CD/FND perform worse on information processing speed tests compared to patients with other SSRD.     

Sex Differences in Furniture Assembly Performance: An Experimental Study

This study examined sex differences in furniture assembly performance by manipulating the availability of instructions. Two groups of participants with an equal number of men and women assembled a kitchen trolley from IKEA. One group received step‐by‐step instructions, and the other group a diagram of the finished product. In addition, individual spatial ability was measured with the mental rotation test (MRT) and added to the analyses. Our results showed that men assembled the furniture faster (d = 0.78) and more accurately (d = 0.65) than women. Overall, participants performed better with step‐by‐step instructions than without (d = 0.61), and the time spent on instructions was negatively related to MRT scores, r = ?.428, p = .006. Aside from the time spent on instructions, women assembled the furniture nearly as fast as men did, and the sex difference in assembly score could be explained by differences in individual spatial ability. Copyright © 2015 John Wiley & Sons, Ltd.