Modeling cognitive load effects of conversation between a passenger and driver

Cognitive load from secondary tasks is a source of distraction causing injuries and fatalities on the roadway. The Detection Response Task (DRT) is an international standard for assessing cognitive load on drivers’ attention that can be performed as a secondary task with little to no measurable effect on the primary driving task. We investigated whether decrements in DRT performance were related to the rate of information processing, levels of response caution, or the non-decision processing of drivers. We had pairs of participants take part in the DRT while performing a simulated driving task, manipulated cognitive load via the conversation between driver and passenger, and observed associated slowing in DRT response time. Fits of the single-bound diffusion model indicated that slowing was mediated by an increase in response caution. We propose the novel hypothesis that, rather than the DRT’s sensitivity to cognitive load being a direct result of a loss of information processing capacity to other tasks, it is an indirect result of a general tendency to be more cautious when making responses in more demanding situations.     

Dimensions of loneliness among Canadian and Czech youth: A cross-national study

The present study examined the influence of cultural background on the causes of adolescents' loneliness. Eighty Canadian youth and 168 adolescents from the Czech Republic formed the participants pool. They answered a thirty-item yes/ no questionnaire. The questionnaire is composed of five subscales, namely: Personal Inadequacies, Developmental Deficits, Unfulfilling Intimate Relationships, Relocation/Significant Separations, and Social Marginality. Results revealed a mixed pattern of differences between the two cultures. Canadian youth had lower mean scores on Personal Inadequacies and Developmental Deficits, but scored higher on Social Marginality. Gender differences within and between the cultures were also examined. Both genders in the Czech Republic had higher mean scores than their Canadian counterparts.     

Studying visual search using systems factorial methodology with target—distractor similarity as the factor

Systems factorial technology (SFT) is a theory-driven set of methodologies oriented toward identification of basic mechanisms, such as parallel versus serial processing, of perception and cognition. Studies employing SFT in visual search with small display sizes have repeatedly shown decisive evidence for parallel processing. The first strong evidence for serial processing was recently found in short-term memory search, using target-distractor (T-D) similarity as a key experimental variable (Townsend & Fifi?, 2004). One of the major goals of the present study was to employ T-D similarity in visual search to learn whether this mode of manipulating processing speed would affect the parallel versus serial issue in that domain. The result was a surprising and regular departure from ordinary parallel or serial processing. The most plausible account at present relies on the notion of positively interacting parallel channels.     

Establishing initial auditory‐visual conditional discriminations and emergence of initial tacts in young children with autism spectrum disorder

Children with autism spectrum disorder (ASD) often display impaired listener skills, and few studies have evaluated procedures for establishing initial auditory‐visual conditional discrimination skills. We developed and evaluated a treatment package for training initial auditory‐visual conditional discriminations based on the extant research on training such discriminations in children with ASD with at least some preexisting skills in this area. The treatment package included (a) conditional‐only training, (b) prompting the participant to echo the sample stimulus as a differential observing response, (c) prompting correct selection responses using an identity‐match prompt, (d) using progressively delayed prompts, and (e) repeating trials until the participant emitted an independent correct response. Results indicated all participants mastered all listener targets, and the two participants for whom we tested the emergence of corresponding tacts showed mastery of most tacts without direct training. We discuss these results relative to prior research on listener skills and tacts.     

Loneliness in cancer and multiple sclerosis patients

Loneliness is a universal social phenomenon often producing debilitating effects on many aspects of human functioning. The present study compared the qualitative aspects of loneliness in two terminally ill samples to that of a more healthy sample. 329 multiple sclerosis and 315 cancer patients, as well as 391 nonrandom healthy participants answered a 30-item questionnaire on loneliness. Analysis indicated the experience of loneliness which characterizes multiple sclerosis and cancer patients differs from that of the more healthy group.     

Loneliness in domestically abused women

The qualitative aspects of loneliness in abused women were explored. 80 women, victims of domestic abuse who were staying in shelters, were compared with 84 women from the general population who had no history of abusive relationships. A 30-item loneliness questionnaire, having five qualitative dimensions of loneliness, namely Emotional Distress, Social Inadequacy and Alienation, Growth and Discovery, Interpersonal Isolation, and Self-alienation, was utilized to compare the loneliness in the two samples. Analysis supported the hypothesis that abused women experience loneliness differently from the general population. These abused women scored significantly higher on Emotional Distress, Interpersonal Isolation, and the Self-alienation subscales.     

The causes of loneliness in homeless youth

Both homelessness and loneliness are pervasive in North America. In this study, the author compared the causes of the loneliness experienced by young homeless youth (n = 113) with that of counterparts in the general population (n = 211) who answered a 30-item yes-no questionnaire. The results identified 5 causes of loneliness: personal inadequacy, developmental deficits, unfulfilling intimate relationships, relocation or significant separations, and social marginality. The results indicated that the causes of loneliness in young homeless youth are significantly different from those of the general population.     

Assessment of Interpersonal Influences on Adolescents: The Parent and Peer Influence Scale

Peer influence is a common topic of interest for parents, clinicians, and researchers, but results from research on the relative importance of parents’ versus peers’ influence on adolescents and young adults has been contradictory. For example, some research suggests that peer attitudes about school influences future academic aspirations, other research suggests that parents and peers differ on their level of influence based on topic (e.g., parents’ are the primary source of influence about moral issues), and other research suggests that peer-oriented children are a product of parental disregard. A reliable and valid measure of the relative strength of parent versus peer influence could enhance research in this area. As a result, the Parent and Peer Inventory Scale (PPI) was developed, which demonstrates strong reliability as well as face and concurrent validity. The PPI can be used both by researchers to address contradictions in the literature, as well as clinicians seeking to evaluate level of peer influence in a family.     

Diagnosing Autism using ICD-10 criteria: A comparison of neural networks and standard multivariate procedures

In a sample of 976 consecutive cases derived from the recent world-wide Field Trial of Autism and other Pervasive Developmental Disorders, we tested the accuracy of the 15 ICD-10 criteria for the diagnosis of Autism, by comparing neural network models (NN) to more conventional multivariate competitors, namely, linear and quadratic discriminant function analyses and logistic regression. NNs were less accurate than competitors, both in terms of cross-validation results as well as in levels of shrinkage from training to test conditions. The clinical research implications of these results are discussed.     

Erratum to: Evaluating perceptual integration: uniting response-time and accuracy-based methodologies

Attention, Perception, & Psychophysics -