Working memory deficits in boys with attention deficit/hyperactivity disorder (ADHD): An examination of orthographic coding and episodic buffer processes

The episodic buffer component of working memory was examined in children with attention deficit/hyperactivity disorder (ADHD) and typically developing peers (TD). Thirty-two children (ADHD = 16, TD = 16) completed three versions of a phonological working memory task that varied with regard to stimulus presentation modality (auditory, visual, or dual auditory and visual), as well as a visuospatial task. Children with ADHD experienced the largest magnitude working memory deficits when phonological stimuli were presented via a unimodal, auditory format. Their performance improved during visual and dual modality conditions but remained significantly below the performance of children in the TD group. In contrast, the TD group did not exhibit performance differences between the auditory- and visual-phonological conditions but recalled significantly more stimuli during the dual-phonological condition. Furthermore, relative to TD children, children with ADHD recalled disproportionately fewer phonological stimuli as set sizes increased, regardless of presentation modality. Finally, an examination of working memory components indicated that the largest magnitude between-group difference was associated with the central executive. Collectively, these findings suggest that ADHD-related working memory deficits reflect a combination of impaired central executive and phonological storage/rehearsal processes, as well as an impaired ability to benefit from bound multimodal information processed by the episodic buffer.     

Do age-related differences in episodic feeling of knowing accuracy depend on the timing of the judgement?

The current study investigated whether there were age-related differences in episodic feeling-of-knowing (FOK) accuracy and whether accuracy was influenced by when the FOK judgements were made. Younger and older participants were randomly assigned to one of four conditions that manipulated the timing of the FOK in relation to cued recall and associative recognition. Age-related differences in FOK accuracy were not reliable either when the FOK was immediate or when it was delayed. Moreover, FOK accuracy was above chance for both age groups. Remember/Know (RK) judgements correlated reliably with FOKs for unrecalled words for both age groups and did not vary by FOK timing. The invariance in FOK accuracy occurred despite robust age differences in associative cued recall and associative recognition, as well as age differences in recollection as measured by RK judgements. The findings are inconsistent with the argument that there is a general age deficit in episodic FOK accuracy. Possible reasons for discrepant findings in the literature are discussed.     

A review of the role of empathy in violence risk in mental disorders

Despite an established link between certain mental disorders and violence, the origins of this are not always clear. Recent work has suggested a role for social cognition deficits in this relationship. We conducted a systematic literature search using EMBASE, SCOPUS, PsychINFO, Science Direct and Ovid Medline databases and search terms relating to empathy, violence and mental disorders. 15 studies were classified as assessing either theory of mind (ToM) (n = 6) or facial affect recognition (FAR) (n = 10). Better mentalizing ability may be linked with violence. Violent patients with schizophrenia perform worse than those with personality disorder, but outperform their non-violent counterparts on complex theory of mind tasks. Six studies examined facial affect recognition in violent psychopathy patients, three of which found impairments in high psychopathy patients. Four studies investigated FAR in violent schizophrenia patients, who again tended to outperform non-violent patients, though the evidence for specificity of emotion remains mixed. Empathy may play a mediating role in the relationship between violence and mental disorder. Current findings are limited by methodological inconsistencies. Future studies would benefit from more comprehensive assessments of violence and co-morbidities, and more standardized measures across studies.     

Fearlessness in juvenile offenders is associated with offending rate

Poor fear conditioning is a correlate of violent offending in adults, but there is no evidence concerning juvenile offenders. Our aim was to compare emotional learning in juvenile offenders and controls and establish whether crime rate is related to seriousness of emotional learning problems. To this end, emotional learning was assessed in 42 juvenile offenders by measuring skin conductance responding (SCR) during fear conditioning. Compared to controls, juvenile offenders showed lower conditioned SCRs to visual stimuli associated with a subsequent aversive stimulus and the magnitude of the SCR during fear acquisition was inversely associated with the number of their recorded offences. These findings suggest that juvenile offenders have impairments in the neural systems that subserve emotional learning. The implication is that using punitive measures to control persistent offenders is unlikely to be effective in an identifiable group of juvenile offenders.     

Relationship between family religious behaviors and child well-being among third-grade children

While there is growing empirical evidence that religion can have a positive impact on the health and well-being of adults and adolescents, less is known about its influence on the welfare of children. The current paper examined the relative importance of family religiosity and religious behaviors on multiple measures of children's well-being (general health, academic achievement, social skills, and behavior problems) and sought to identify whether religious variables contribute above and beyond non-religious measures of family caregiving. Parent use of religious coping and family religious behaviors, the latter defined as attendance at religious or spiritual programs, predicted several aspects of child well-being above and beyond parenting styles. Parental religious coping significantly predicted child social skills and externalizing behaviors above and beyond parenting styles. Family religious service attendance significantly predicted child health and social skills, and inversely predicted internalizing behaviors, above and beyond both parenting styles and parent use of religious coping.     

Identity and Location Priming Effects and their Temporal Stability in Young and Older Adults

ABSTRACT

Unlike previous studies, the present experiment was designed to directly compare negative (NP) and positive priming (PP) in 37 young (mean age: 21.5 years) and 37 older adults (mean age: 69.4 years) by means of two independent identity- and location-based priming tasks. While identity PP was shown to be reduced in older adults, no age-related differences were found for location PP. This pattern of results supports the notion that mechanisms involved in identity- and location-based PP are largely independent of each other. Both age groups exhibited reliable identity and location NP although location NP was decreased in older adults. Extremely low temporal test–retest coefficients indicated that mechanisms underlying identity and location NP represent situational states rather than stable traits. This lack of temporal stability may also account for highly ambiguous results obtained in previous studies.     

The effects of acute stress on Pavlovian-instrumental transfer in rats

Pavlovian stimuli invigorate ongoing instrumental action, a phenomenon termed the Pavlovian–instrumental transfer (PIT) effect. Acute stressors can markedly enhance the release of corticotropin-releasing factor (CRF), and CRF injection into the nucleus accumbens increases the PIT effect. However, it is unknown whether acute stressors by themselves would amplify the PIT effect. Here, we examined the effects of acute stressors on PIT. Rats first received Pavlovian and instrumental training, and then the impact of the Pavlovian stimuli on instrumental responding was analyzed in the subsequent PIT test. Acute stressors were applied prior to the PIT test. Because the effects of acute stressors critically depend on stressor type and time of day, we used two acute stressors that involved one or several distinct stressors (denoted here as “single” vs. “multiple” stressors) applied either in the light or the dark period of the light:dark cycle. The results revealed that single and multiple stressors applied in the light period did not alter the PIT effect—that is, the ability of an appetitive Pavlovian stimulus to enhance leverpressing—or the basal leverpress rate. When applied in the dark period, single and multiple stressors also did not alter the PIT effect, but they did markedly reduce the basal leverpress rate. Diazepam pretreatment did not counteract the declines in basal instrumental responding in the PIT test that were induced by either a single or multiple stressors. Our findings suggest that acute stressors were unable to amplify the incentive salience of reward-predictive Pavlovian stimuli to activate instrumental responding, but, depending on the time of day of stressor exposure, they did reduce basal instrumental responding.