Individual differences in the Behavioral Inhibition System are associated with orbitofrontal cortex and precuneus gray matter volume

The Behavioral Inhibition System (BIS) is described in Gray's Reinforcement Sensitivity Theory as a hypothetical construct that mediates anxiety in animals and humans. The neuroanatomical correlates of this system are not fully clear, although they are known to involve the amygdala, the septohippocampal system, and the prefrontal cortex. Previous neuroimaging research has related individual differences in BIS with regional volume and functional variations in the prefrontal cortex, amygdala, and hippocampal formation. The aim of the present work was to study BIS-related individual differences and their relationship with brain regional volume. BIS sensitivity was assessed through the BIS/BAS questionnaire in a sample of male participants (N = 114), and the scores were correlated with brain regional volume in a voxel-based morphometry analysis. The results show a negative correlation between the BIS and the volume of the right and medial orbitofrontal cortices and the precuneus. Our results and previous findings suggest that individual differences in anxiety-related personality traits and their related psychopathology may be associated with reduced brain volume in certain structures relating to emotional control (i.e., the orbitofrontal cortex) and self-consciousness (i.e., the precuneus), as shown by our results.     

Learning the Ropes: The Protective Role of Mentoring in Correctional Police Officers’ Socialization Process

Formal mentoring is an individualized and contextualized socialization tactic to enhance newcomers’ learning—acknowledged as essential in the early career stage—that can be of particular value when entering a fairly unpredictable and stressful workplace. This research aims to understand the moderating role of formal mentoring in the relationship between organizational socialization and 2 adjustment indicators, a positive 1 (commitment) and a negative 1 (turnover intention). A questionnaire was administered to 117 correctional police officer newcomers, as prisons are especially critical work contexts for newcomers. The results show a direct effect from both socialization and mentoring on commitment and turnover, and an interaction between socialization and mentoring on turnover, although not on commitment. When the socialization process progresses steadily, both socialization and mentoring contribute to good adjustment, but when traditional tactics go wrong, a different learning source (formal mentoring) exerts a protective function, limiting newcomers’ intention to quit. These findings give support to the usefulness of mentoring in a law enforcement context and provide some insight into defining formal mentoring programs.     

Greater pressor reactivity in women with pre-eclampsia is not related to specific psychological or emotional stressors

To investigate whether emotional or psychosocial factors could be significantly related with the development of pre-eclampsia, 15 pregnant women with early diagnosis of pre-eclampsia and 15 normotensive pregnant controls of comparable age (23-37 yr.), gestational age (10-37 wk.), parity (70% primiparous), amount of instruction, and marital status underwent a blood pressure monitoring during a specific psychological assessment based on a semistructured interview followed by the administration of three different questionnaires: the Symptom Checklist 90-Revised, the Perceived Stress Questionnaire-Recent, and the Questionnaire about Social Relationships. Systolic and diastolic blood pressure and heart rate were measured at 2-min. intervals by an automatic device both during the interview and the questionnaires' administration. Both systolic and diastolic responses were significantly increased in both groups during the interview (deltaSBP = 15 vs. 10%; deltaDBP=28 vs. 15.8%), whereas no differences were observed in blood pressure while answering questionnaires. Conversely, differences in questionnaire responses between groups were not statistically significant. Present results confirm a greater pressor reactivity in these women with pre-eclampsia but does not specifically support that this was related to psychological or emotional stress.     

Time processing in children with Tourette’s syndrome

Background

Tourette syndrome (TS) is characterized by dysfunctional connectivity between prefrontal cortex and sub-cortical structures, and altered meso-cortical and/or meso-striatal dopamine release. Since time processing is also regulated by fronto-striatal circuits and modulated by dopaminergic transmission, we hypothesized that time processing is abnormal in TS.

Methods

We compared time processing abilities between nine children with TS-only (i.e. without major psychiatric comorbidities) and 10 age-matched healthy children, employing a time reproduction task in which subjects actively reproduce different temporal intervals, and a time comparison task in which subjects judge whether a test interval is longer or shorter than a reference interval. IQ, sustained and divided attention, and working memory were assessed in both groups using the Leiter International Performance Scale-Revised, and the Digit Span sub-test of the WISC-R.

Results

Children with TS-only reproduced in an overestimated fashion over-second, but not sub-second, time intervals. The precision of over-second intervals reproduction correlated with tic severity, in that the lower the tic severity, the closer the reproduction of over-second time intervals to their real duration. Time reproduction performance did not significantly correlate with IQ, attention and working memory measures in both groups. No differences between groups were documented in the time comparison task.

Conclusions

The improvement of time processing in children with TS-only seems specific for the over-second range of intervals, consistent with an enhancement in the ‘cognitively controlled’ timing system, which mainly processes longer duration intervals, and depends upon dysfunctional connectivity between the basal ganglia and the dorso-lateral prefrontal cortex. The absence of between-group differences on time comparison, moreover, suggests that TS patients manifest a selective improvement of ‘motor’ timing abilities, rather than of perceptual time abilities. Our data also support an enhancement of cognitive control processes in TS children, probably facilitated by effortful tic suppression.     

Motion-induced blindness measured objectively

During central fixation, a moving pattern of nontargets induces repeated temporary blindness to even salient peripheral targets: motion-induced blindness (MIB). Hitherto, behavioral measures of MIB have relied on subjective judgments. Here, we offer an objective alternative that builds on earlier findings regarding the effects of MIB on the detectability of physical target offsets. We propose a small modification of regular MIB displays: Following a variable duration (lead time), one of the targets is physically removed. Subjects are to respond immediately afterward. We hypothesize that illusory target offsets, caused by MIB, are mistaken for physical target offsets and that errors should thus increase with lead time. Indeed, for both nonsalient and salient targets, we found that detection accuracy for physical target offsets dramatically decreased with lead time. We conclude that target offset detection accuracy is a valid objective measure of MIB. With our method, effects of guessing are minimal, and the fitting of psychometric functions is straightforward. In principle, a staircase extension—for more efficient data collection—is also possible.     

Cross‐Situational Learning of Phonologically Overlapping Words Across Degrees of Ambiguity

Cross‐situational word learning (XSWL) tasks present multiple words and candidate referents within a learning trial such that word–referent pairings can be inferred only across trials. Adults encode fine phonological detail when two words and candidate referents are presented in each learning trial (2 × 2 scenario; Escudero, Mulak, & Vlach, 2016a ). To test the relationship between XSWL task difficulty and phonological encoding, we examined XSWL of words differing by one vowel or consonant across degrees of within‐learning trial ambiguity (1 × 1 to 4 × 4). Word identification was assessed alongside three distractors. Adults finely encoded words via XSWL: Learning occurred in all conditions, though accuracy decreased across the 1 × 1 to 3 × 3 conditions. Accuracy was highest for the 1 × 1 condition, suggesting fast‐mapping is a stronger learning strategy here. Accuracy was higher for consonant than vowel set targets, and having more distractors from the same set mitigated identification of vowel set targets only, suggesting possible stronger encoding of consonants than vowels.