Is visual short-term memory object based? Rejection of the “strong-object” hypothesis

Is the capacity of visual short-term memory (VSTM) limited by the number of objects or by the number of features? VSTM for objects with either one feature or two color features was tested. Results show that capacity was limited primarily by the number of colors to be memorized, not by the number of objects. This result held up with variations in color saturation, blocked or mixed conditions, duration of memory image, and absence or presence of verbal load. However, conjoining features into objects improved VSTM capacity when size-orientation and color-orientation conjunctions were tested. Nevertheless, the number of features still mattered. When feature heterogeneity was controlled, VSTM for conjoined objects was worse than VSTM for objects made of single features. Our results support a weak-object hypothesis of VSTM capacity that suggests that VSTM is limited by both the number of objects and the feature composition of those objects.     

Leading,but not trailing,primes influence temporal order perception: further evidence for an attentional account of perceptual latency priming

Presenting a masked prime leading a target influences the perceived onset of the masking target (perceptual latency priming; Scharlau & Neumann, in press). This priming effect is explained by the asynchronous updating model (Neumann, 1982; Scharlau & Neumann, in press): The prime initiates attentional allocation toward its location, which renders a trailing target at the same place consciously available earlier. In three experiments, this perceptual latency priming by leading primes was examined jointly with the effects of trailing primes in order to compare the explanation of the asynchronous updating model with the onset-averaging and the P-center hypotheses. Experiment 1 showed that an attended, as well as an unattended, prime leads to perceptual latency priming. In addition, a large effect of trailing primes on the onset of a target was found. As Experiment 2 demonstrated, this effect is quite robust, although smaller than that of a leading prime. In Experiment 3, masked primes were used. Under these conditions, no influence of trailing primes could be found, whereas perceptual latency priming persisted. Thus, a nonattentional explanation for the effect of trailing primes seems likely.     

A preliminary study of self-esteem,stigma, and disclosure in adolescents who stutter

This study examined the self-esteem, perceived stigma, and disclosure practices of 48 adolescents who stutter divided into two age cohorts: younger (13, 14, and 15 years) and older (16, 17, and 18 years) adolescents. Results revealed that 41 (85%) of the participants scored within 1 S.D. from the mean on a standardized measure of self-esteem, indicative of positive self-esteem. Results also showed that stuttering did not present a stigmatizing condition for the majority (65%) of adolescents who stutter. However, 60% of participants indicated that they "rarely" or "never" discussed their stuttering. The younger adolescents perceived stuttering as a more negative and stigmatizing condition than older adolescents. Implications for understanding stuttering in adolescents are discussed. EDUCATIONAL OBJECTIVES: Readers will learn about and understand (a) the role of stigma, disclosure, and self-esteem in stuttering; (b) the methods used to evaluate stigma, disclosure, and self-esteem in adolescents; and (c) the similarities between adolescents who stutter and normative data on self-esteem and stigma scales.     

Accuracy, completeness, and consistency of emotional memories

Judges and lawyers often consider inconsistent testimonies to be inaccurate. We addressed this assumption by asking undergraduate students on 2 occasions to write detailed accounts of violent movie fragments they had seen. These accounts were evaluated in terms of accuracy, completeness, and consistency. Experiment 1 showed that accounts tended to be accurate. Moreover, first accounts were marginally more complete than second accounts. The number of inconsistencies between the 2 accounts was not significantly related to their accuracy. Experiment 2 sought to replicate these findings using a more emotionally upsetting movie fragment. Results were highly similar to those of Experiment 1 in that accounts tended to be accurate but incomplete. Inconsistencies were not significantly related to the accuracy of participants' accounts. In line with previous research, we found that accounts of emotional events can be highly accurate but tend to be incomplete. More importantly, inconsistencies cannot be seen as valid predictors of testimonial inaccuracy.     

Perceptual grouping in change detection

Detection of an item's changing of its location from one instance to another is typically unaffected by changes in the shape or color of contextual items. However, we demonstrate here that such location change detection is severely impaired if the elongated axes of contextual items change orientation, even though individual locations remain constant and even though the orientation was irrelevant to the task. Changing the orientations of the elongated stimuli altered the perceptual organization of the display, which had an important influence on change detection. In detecting location changes, subjects were unable to ignore changes in orientation unless additional, invariant grouping cues were provided or unless the items changing orientation could be actively ignored using feature-based attention (color cues). Our results suggest that some relational grouping cues are represented in change detection even when they are task irrelevant.     

Visual short-term memory is not improved by training

A critical question in visual working or short-term memory (VSTM) research is whether the ability to remember briefly presented visual stimuli can be increased. Here we test whether VSTM for locations and shapes is improved by training that allows one to utilize another memory system, visual longterm memory (VLTM). Training was done by repeatedly presenting a subset of memory displays, creating long-term memory traces for these displays. Surprisingly, VSTM performance for repeated displays was not higher than for nonrepeated ones, even though participants recognized repeated displays on a forced-choice test given at the end of the experiment. We suggest that the fidelity of information held by VLTM is inferior to that of information held by VSTM and thus provides no additional benefit over what is extracted on the fly by VSTM.     

A comparison of intervention for problematic speech using reinforcement with and without preferred topics

Previous research has shown that responding to the appropriate and problematic speech of individuals diagnosed with developmental disabilities with interested and uninterested listener responses, respectively, can promote more appropriate conversational engagement. However, Fisher et al. (2013) also responded to appropriate speech with access to preferred conversational topics. This study examined the influence of listener interest on the problematic speech of 8 participants and tested the additive effects of (Study 1) and participant preference for (Study 2) delivering preferred topics as reinforcement for appropriate speech. Interventions were equally effective with or without arranging access to preferred topics, but a majority of participants demonstrated a preference for intervention with contingent access to preferred topics. Caregivers and speech‐language pathologists rated the intervention procedures as acceptable and changes in participants' speech satisfactory.     

Gender-Specific Trajectories of Conduct Problems from Ages 3 to 11

Gender-specific pathways of conduct problems (CP) from toddlerhood have received little attention. Using a nationally representative sample of UK children born in 2000–2001 (6458 boys and 6340 girls), the current study (a) identified subgroups of CP pathways separately for boys and girls from ages 3 to 11 and (b) examined early precursors (pregnancy to 9 months) of these trajectories. Group-based trajectory models identified four distinct trajectories for both boys and girls: each characterized as ‘low’; ‘early-onset, desisting’; ‘early-onset, persistent’ and ‘school-onset’. This suggests that the taxonomic framework developed to conceptualise childhood-onset CP among males is also applicable to females, though needing some revision to capture heterogeneity identified during early and middle childhood. We also found significant precursors of the different trajectory groups with some variation by gender. Early socioeconomic deprivation was a significant risk factor of the early-onset pathways among both genders, but played no significant role for ‘school-onset’. Childhood-onset trajectories of boys, but not girls, were predicted by parenting attitudes and behaviour.     

Quality of life and depression in haemodialysis patients

Chronic kidney disease is associated with a high prevalence of depression, which increases inversely with the glomerular filtration rate. This paper aims to evaluate the factors associated with a low quality of life and depression in patients on haemodialysis. Two hundred patients undergoing haemodialysis answered the Medical Outcomes Study 36 – Item Short – Form Health Survey (SF-36) and Beck Depression Inventory (BDI). Clinical and laboratory variables were analysed and correlated with these two tools. The prevalence of depression was 29%. Anaemia and hypoalbuminemia were independent risk factors for depression. All SF-36 domains showed worse results in patients with depression, and the pain domain presented the highest correlation. Our findings provide evidence that patients on haemodialysis have a low quality of life and a high prevalence of depression. A greater number of comorbidities, an excessive number of medications, diabetes mellitus, anaemia and hypoalbuminemia were associated with a reduced quality of life.