Individual psychophysical functions for 28 odorants

Individual scales of odor intensity were obtained for 28 different chemical compounds by the method of magnitude estimation. Eleven Ss participated in an experiment with 196 olfactory stimuli which differed in both quality and intensity. It was found (1) that power functions described the relationship between partial vapor pressure of the odorants and their subjective odor intensity for all Ss, (2) that all exponents were less than one but varied greatly between Ss, (3) that consistent intraindividual differences in the exponents of different odorants exist, and (4) that these are attributable to perceptual differences rather than to response bias.     

The effect of adaptation on odor detection

The sensitivity of human Ss to a weak odor (hydrogen sulphide) following prior exposure to it varying in both duration (0–5 min) and concentration (4.05 × 10^?7 to 24.40 × 10^?7 mg/liter) was studied with a yes-no detection method and a specially designed olfactometer. The effect of adaptation was demonstrated, because the proportion of hits was lower the higher the concentration of the adaptation stimulus, when the response criterion, as measured by the proportion of false alarms, was fairly constant. By contrast, the proportion of hits was apparently independent of the duration of the exposure to the adaptation concentration. This finding suggests that the sense of smell is more stable than is usually believed. The paper ends with a discussion of the importance of considering adaptation in contemporary detection theory.     

Communicative skills in relation to gender, birth order, childcare and socioeconomic status in 18-month-old children

Variation in communicative skills, defined as gestures, vocabulary comprehension and vocabulary production, was examined as a function of gender, birth order, childcare and socioeconomic status (SES) in 1,019 18-month-old children. The children were recruited at their regular check-up at a number of randomly selected Child Health Care centers in a Swedish county. The participation rate was 88%. The children were assessed by their mothers using a short version of the Swedish Early Communicative Development Inventories. The results demonstrate significant effects of gender and birth order on vocabulary comprehension and vocabulary production. Girls scored higher than boys and first-born children scored higher than later-born children. Type of childcare (family care, care at home and day-care centers) interacted with gender and birth order on vocabulary production and indicated that family care is not as advantageous as care at home or at day-care centers. SES had no effect on children's communicative skills at this age.     

Attention demands influence 10- and 12-month-old infants' perseverative behavior

The present study examined the role of attentional demand on infants' perseverative behavior in a noncommunicative looking version of an A-not-B task. The research aimed at clarifying age-related improvements in the attention process that presumably underlies the development of cognitive control. In a between-subjects design, forty 10-month-olds and forty 12-month-olds were assigned to either a distractor or a no-distractor condition as a means of testing the role of attentional load. The authors used an eye tracker to record infants' looking behavior while they anticipated the reappearance of the target of interest as well as continuously throughout the task. The data demonstrated that 10-month-olds show more perseverative looking than do 12-month-olds and that increased attentional demand leads to more perseverative looking. Correct anticipation, however, was not affected by age or distraction. The results also failed to show that 12-month-olds are better than 10-month-olds at handling the increased attentional demand introduced in the distractor condition, in that the effect of the distractor was not larger for the younger infants. Our results are in line with the theoretical view of cognitive control as dependent on a limited attentional resource, which can explain perseverative behaviors in different tasks and at different ages.     

Disorganized Attachment and Inhibitory Capacity: Predicting Externalizing Problem Behaviors

The aim of the present study was to investigate whether attachment insecurity, focusing on disorganized attachment, and the executive function (EF) component of inhibition, assessed at age 5, were longitudinally related to general externalizing problem behaviors as well as to specific symptoms of ADHD and Autism spectrum disorder (ASD), and callous-unemotional (CU) traits. General externalizing problem behaviors were also measured at age 5 to allow for a developmental analysis. Outcome variables were rated by parents and teachers. The sample consisted of 65 children with an oversampling of children with high levels of externalizing behaviors. Attachment was evaluated using a story stem attachment doll play procedure. Inhibition was measured using four different tasks. The results showed that both disorganized attachment and poor inhibition were longitudinally related to all outcome variables. Controlling for initial level of externalizing problem behavior, poor inhibition predicted ADHD symptoms and externalizing problem behaviors, independent of disorganized attachment, whereas for ASD symptoms no predictive relations remained. Disorganized attachment independently predicted CU traits.     

Young People,Sexuality, and HIV Prevention Within Christian Faith Communities in South Africa: A Cross-Sectional Survey

Faith communities exert a powerful influence on the life of their members, and studies are needed about how they may be able to influence young people’s attitudes regarding sexuality and HIV prevention. Data were collected through a self-administered questionnaire from young people (811), aged 15–24 years, affiliated to the Roman Catholic Church, the Lutheran Church and the Assemblies of God. The majority of participants perceived themselves at risk of HIV infection (53 %). Premarital sexual abstinence was the most frequently (88 %) reported prevention message, followed by faithfulness (23 %), HIV testing (18 %) and condom use (17 %). Furthermore, religious affiliation was associated with education on sexuality and HIV in youth groups, with better information given to members of the Lutheran and Catholic churches. Faith communities need to strengthen their capacity to educate young people in a more holistic way about sexuality and HIV prevention.     

ADHD Symptoms and Attachment Representations: Considering the Role of Conduct Problems,Cognitive Deficits and Narrative Responses in Non-Attachment-Related Story Stems

The overall aim of the present study was to investigate ADHD symptoms in relation to attachment representations. We used both attachment- and non-attachment-related story stems, which allowed us to investigate whether problems with narrative production can explain the relation between ADHD symptoms and attachment representations. We also investigated the role of cognitive deficits and conduct problems in these relations. The sample consisted of 89 children (27 % girls) between 6 and 10 years old, with an oversampling of children with high levels of ADHD symptoms. ADHD symptoms and conduct problems were rated by parents and teachers. Cognitive functioning was investigated using laboratory tests of inhibition, working memory and sustained attention. Attachment representations were coded as secure, organized insecure and disorganized categories. Narrative responses to non-attachment-related story stems were coded for incoherence and negative content. Results showed that children in the disorganized attachment category had significantly higher levels of ADHD symptoms compared to those in the secure category. Both ADHD symptoms and disorganized attachment were related to incoherence and negative content. Attachment representations were not associated with ADHD symptoms when controlling for negative content in response to non-attachment-related story stems. These results suggest that the associations between attachment security and ADHD are yet to be fully understood. Importantly, a propensity to envisage negative events seems to characterize children with high levels of ADHD symptoms.     

Vygotsky's Theory of Creativity

In Educational Psychology (1997/1926), Vygotsky pleaded for a realistic approach to children's literature. He is, among other things, critical of Chukovsky's story "Crocodile" and maintains that this story deals with nonsense and gibberish, without social relevance. This approach Vygotsky would leave soon, and, in Psychology of Art (1971/1925), in which he develops his theory of art, he talks about connections between nursery rhymes and children's play, exactly as the story of Chukovsky had done with the following argument: By dragging a child into a topsy-turvy world, we help his intellect work and his perception of reality. In his book Imagination and Creativity in Childhood (1995/1930), Vygotsky goes further and develops his theory of creativity. The book describes how Vygotsky regards the creative process of the human consciousness, the link between emotion and thought, and the role of the imagination. To Vygotsky, this brings to the fore the issue of the link between reality and imagination, and he discusses the issue of reproduction and creativity, both of which relate to the entire scope of human activity. Interpretations of Vygotsky in the 1990s have stressed the role of literature and the development of a cultural approach to psychology and education. It has been overlooked that Vygotsky started his career with work on the psychology of art.