An odorant congruent with a colour cue is selectively perceived in an odour mixture

Odour identification can be influenced by colour cues. This study examined the mechanism underlying this colour context effect. We hypothesised that a specific odour component congruent with a colour would be selectively perceived in preference to another odour component in a binary odour mixture. We used a ratio estimation method under two colour conditions, a binary odour mixture (experiment 1) and single chemicals presented individually (experiment 2). Each colour was congruent with one of the odour components. Participants judged the perceived mixture ratio in each odour container on which a colour patch was pasted. An influence of colour was not observed when the odour stimulus did not contain the odour component congruent with the colour (experiment 2); however, the odour component congruent with the colour was perceived as more dominant when the odour stimulus did contain the colour-congruent odorant (experiment 1). This pattern indicates that a colour-congruent odour component is selectively perceived in an odour mixture. This finding suggests that colours can enhance the perceptual representation of the colour-associated component in an odour mixture.     

Enhanced development of auditory change detection in musically trained school‐aged children: a longitudinal event‐related potential study

Adult musicians show superior auditory discrimination skills when compared to non‐musicians. The enhanced auditory skills of musicians are reflected in the augmented amplitudes of their auditory event‐related potential (ERP) responses. In the current study, we investigated longitudinally the development of auditory discrimination skills in musically trained and nontrained individuals. To this end, we recorded the mismatch negativity (MMN) and P3a responses from children who play a musical instrument and age‐matched children with no musical training at ages 7, 9, 11, and 13. Basic auditory processing was investigated by recording ERPs in the Multi‐Feature Paradigm that included frequency, duration, intensity, location, and gap deviants. The detection of musically more relevant sound changes was examined in an oddball paradigm with major chords as standards and minor chords as deviants. The musically trained children showed larger increase in MMN and P3a amplitudes with age for the chord deviants than the control children. There was also a strong trend (p = .054) for larger increase in MMN amplitude in the musically trained children for the location deviant. As no group differences in response amplitudes were evident at the early stages of the training, our results suggest that the superior neural auditory discrimination in adult musicians is due to training and not pre‐existing differences between musicians and non‐musicians.     

Meaning as perceived and experienced by an African student group

This qualitative study explored what a Batswana group of African students (N?=?73) find most meaningful in their life and why those sources of meaning are important to them. Findings showed that, in line with previous Western studies, the most important source of meaning is relationships, and in particular family which provides support, but is also intrinsically valuable. Relatedness in this African group is also different from Western conceptualisations and previous empirical findings in the sense that horizontal (interpersonal) and vertical (spiritual) relationships are deeply intertwined. Education as a domain of life is also an important source of meaning to this cohort of students. The reported perceived meanings and experienced reasons bring forth a picture that resonates with values and expectations from the specific cultural and life phase contexts in which these African students are embedded. The meaning of these meanings for the enhancement of well-being in students merits exploration.     

The Role of Personality Factors in the Dynamics of Context and Psychological Well-Being

The purpose of this study was to determine personality factors that mediate between context and psychological well-being. A convenience sample of 514 mutlicultural participants from Potchefstroom (n=384) and Mafikeng (n=130) comprising mainly of black and white students was drawn. The participants completed measures on extraversion and agreeableness and psychological well-being in a cross-sectional survey. Context was defined in terms of differentials pertaining to race, socioeconomic differentials and infrastructural resources. Regression analyses indicated the viability of relationships among context, personality and psychological well-being. Structural equation models showed that both extraversion and agreeableness mediate the relationship between context and psychological well-being. Future research using longitudinal designs may study the importance of social context, personality factors and psychological well-being within and between groups.     

Psychological Strengths as Predictors of Postgraduate Students' Academic Achievement

This study sought to predict students' Grade Point Average (GPA) from their personal sense of coherence, locus of control, hope and research self-efficacy. Participants were 429 postgraduate students at a large South African university (males = 86, females = 311, age range = 20 to 53, mean age = 30, SD = 6.77). They completed measures of sense of coherence, locus of control, hope orientation and research self-efficacy. Data were analysed using logistic regression. Results revealed that only research self-efficacy significantly predicted academic achievement. Although of small practical significance, it seems that students' beliefs about their own potential and abilities regarding research could influence their success to some degree. It is recommended that research self-efficacy, together with other psychological strengths, be further investigated as a predictor of academic success.     

Guilt and regret: The determining role of interpersonal and intrapersonal harm

The purpose of the present research was to examine which types of harm play a determining role in experiences of guilt and regret. In two studies it is shown that guilt results from interpersonal harm and regret from harm to oneself. Moreover, the second study showed that guilt generally increases as a function of the level of negative interpersonal consequences of one's behaviour. It was also demonstrated that regret increased as a function of the level of negative intrapersonal consequences but not as a function of the level of negative interpersonal consequences. Results are discussed in terms of theoretical dimensions underlying experiences of guilt and regret.     

Tests of Parallel Versus Integrated Structure in Polyrhythmic Tapping

Musically trained subjects tapped three beats with their right hand versus two beats with their left hand in synchrony with two corresponding tones. For independent groups of subjects, the pitch difference of the two tones was either small to encourage an integrated perceptual organization or large to encourage a streamed perceptual organization. Integrated versus parallel motor organization was tested by examining the pattern of covariances among intertap intervals. All subjects exhibited integrated motor organization. An integrated multiplicative hierarchical model of motor organization was superior to a serial chained model and to an independent hierarchical model in describing the pattern of covariances. The subjects who heard tones that encouraged an integrated percept performed with less variability than the subjects who heard tones that encouraged a streamed percept. This superior performance with an integrated motor organization and an integrated rather than a streamed perceptual organization is interpreted as evidence for temporal perceptual-motor compatibility.     

Age-Related Changes in Executive Function: A Normative Study with the Dutch Version of the Behavior Rating Inventory of Executive Function (BRIEF)

This study examined age-related change in executive function by using a Dutch translation of the Behavior Rating Inventory of Executive Function (BRIEF; Gioia et al., 2000 Gioia, G. A., Isquith, P. K., Guy, S. C. and Kenworthy, L. 2000. Behavior Rating Inventory of Executive Function BRIEF): Professional manual, Lutz, FL: Psychological Assessment Resources.  [Google Scholar]) that was applied to a normative sample (age range 5–18 years). In addition, we examined the reliability and factorial structures of the Dutch BRIEF. Results with respect to age revealed a decrease in reported executive function problems with increasing age. On the Behavior Regulation Index (BRI), 5- to 8-year-olds showed significantly more executive function problems than 9- to 11-year-olds, as did the 12- to 14-year-olds compared to 15- to 18-year-olds (except on the Shift subscale). On the Metacognition Index, we found that 9- to 11-year-olds differed significantly from 5- to 8-year-olds on the Working Memory subscale. In addition, the current study showed that the internal consistency of the Dutch BRIEF is very high, and that this version of the BRIEF has a high test-retest stability. Item factor analysis confirmed the expected eight common factor model, and factor analysis of the eight test scores confirmed the two-factor model, as proposed by Gioia et al., in the Dutch data.