Maternal parenting stress and mothers' reports of their infants' mastery motivation

Mastery motivation is a psychological force that stimulates an individual to attempt to master a task that is challenging to him or her. This prospective longitudinal study examined the relationship between maternal stress, using the Parenting Stress Index-Short Form, and infant mastery motivation, using the Dimensions of Mastery Questionnaire, for 150 mother-infant pairs assessed at both 6- and 18-months of age. Infants of mothers with elevated stress levels at 6 months tended to show lower mastery motivation at 18 months (standardized beta=-.46, p=.001). Conversely, infants with lower general competence (standardized beta=-.24, p=.021) and lower persistence during social interactions with other children (standardized beta=-.18, p=.037) at 6 months of age had mothers with elevated total stress at 18 months of age. Implications for programs which simultaneously intervene with child and mother are discussed.     

An experimental study of behavioural coping strategies in free-ranging female Barbary macaques (Macaca sylvanus)

A fundamental goal of stress research is to understand how individuals cope with challenges. Studies on a range of vertebrate species suggest that three groups of behaviour-affiliative, aggressive and self-directed behaviours-serve as coping strategies. To date, experimental studies of coping behaviour have tended to be conducted in captive conditions; the limited number of studies in free-ranging or wild settings have been observational in nature. We investigated coping behaviours in free-ranging female Barbary macaques (Macaca sylvanus) at Trentham Monkey Forest, UK, using an experimental playback approach to quantify subjects' responses to mildly aversive threat-grunts. Compared to silent control trials, playbacks of threat-grunts increased aggressive behaviours and one of the two self-directed behaviours examined (self-scratching). No such differences were seen for self-grooming, or for any affiliative behaviour. Elevations in the rate of one measure of aggression, lunging, were positively related to an average measure of adrenocortical activity (median faecal glucocorticoid metabolite levels over the study period). Evidence from females in a variety of Old World monkey species, including Barbary macaques, indicates that affiliative behaviours have an important role in coping with stressful events in the medium to longer term. Our results suggest that, in the short term, female Barbary macaques may use aggressive rather than affiliative behaviours in response to mild stress. These findings highlight the importance of considering how coping mechanisms may vary over time after a stressor, and how coping mechanisms relate to adrenocortical activity. Playback approaches like ours provide a powerful, flexible tool to explore issues such as this in free-ranging and wild animal populations.     

Investigating the interaction between schizotypy, divergent thinking and cannabis use

Cannabis acutely increases schizotypy and chronic use is associated with elevated rates of psychosis. Creative individuals have higher levels of schizotypy, however links between cannabis use, schizotypy and creativity have not been investigated. We investigated the effects of cannabis smoked naturalistically on schizotypy and divergent thinking, a measure of creativity. One hundred and sixty cannabis users were tested on 1 day when sober and another day when intoxicated with cannabis. State and trait measures of both schizotypy and creativity were administered. Quartile splits compared those lowest (n=47) and highest (n=43) in trait creativity. Cannabis increased verbal fluency in low creatives to the same level as that of high creatives. Cannabis increased state psychosis-like symptoms in both groups and the high creativity group were significantly higher in trait schizotypy, but this does not appear to be linked to the verbal fluency change. Acute cannabis use increases divergent thinking as indexed by verbal fluency in low creatives.     

Naturalism and Normativity

Synthetic naturalism is a form of moral realism which holds that we can discover a posteriori that moral properties exist and are natural properties. On this view moral discourse earns the right to be construed realistically because it meets the conditions that license realism about any discourse, that properties it represents as existing pull their weight in empirical explanations of our observations of the world. I argue that naturalism is an inadequate metaphysics of moral value, because parallel arguments to those used by the naturalist to establish the reality of 'moral' properties and their normativity for persons of sympathetic temperament can be constructed, which would equally demonstrate the reality of normatively antagonistic value properties, and their normativity for differently psychologically constituted agents. Since moral discourse implicitly denies that there are such diverse and competing normative truths the strategy fails to establish moral realism.     

Behavioral effects following rehabilitation from postnatal exposure to lead acetate

At 21 days of age three groups of male hooded rats of the Sprague-Dawley strain were exposed to either untreated water or lead acetate at concentrations of 25 or 50 ppm provided ad lib. in the drinking water for 40 days. When tested for spontaneous alternation, the subjects receiving both 50 ppm and 25 ppm lead acetate exhibited significantly reduced rates of alternation below those of untreated control subjects. Immediately subsequent to testing, lead was removed from the diet of the experimental groups and water substituted which was provided ad lib. for the duration of the experiment. This regimen of rehabilitation was continued for 70 days at which time all subjects were tested on the problems of the Hebb-Williams closed-field maze-learning task. No significant differences were found in the time taken to traverse the maze enclosure, the number of squares traversed, or in the total number of error zones entered over the 12 test problems, although significantly increased latencies to leave the start box were noted for subjects previously exposed to lead acetate. These data indicate that some deficits produced by postweaning lead acetate exposure may be reversible and not persist beyond a period of rehabilitation.     

Developmental and individual differences in performance on phonological synthesis tasks

This study was conducted in order to examine the role of individual differences in working memory and lexical access in accounting for age and reading skill related differences in performance on phonological synthesis tasks. The performance of 28 kindergarten, first-, and second-grade children with normal reading skills, as well as that of 28 reading-disabled second graders, was compared under four testing conditions. The testing conditions were formed by completely crossing rate of presentation of phoneme strings with type of stimulus to be blended (real or nonword). Both independent variables affected performance on the blending tasks, with better performance obtained at faster presentation rates and with real words. There was a developmental discontinuity in overall performance, with the kindergarten children obtaining substantially lower scores than the first or second graders. In the comparison of second-grade good and poor readers, there was a significant interaction between groups, presentation rates, and type of stimulus. The findings are discussed in terms of their implications for a general model of performance on the sound blending task, as well as their value for interpreting individual differences on the task.     

An auditory Stroop effect for pitch, loudness, and time

Increased reaction time to pitch, loudness, or duration of an auditorily presented word whose meaning is in conflict with the response label (i.e., high/low, loud/soft, or fast/slow) demonstrates an auditory Stroop effect. Fifteen normal adults participated in an auditory Stroop test. Analysis of reaction time data supports the existence of an auditory Stroop effect for pitch and loudness, but not duration. The interaction between psychoacoustic and semantic attributes of speech stimuli is discussed.     

The career aspirations and occupational interests of culturally disadvantaged children

The occupational aspirations and interests of a sample of culturally disadvantaged children aged 15½ years and a matched control group were compared. Whilst the disadvantaged boys aspired to jobs of lower social-class status than their control-group peers, the two girls' groups showed very similar aspiration levels, and the disadvantaged group as a whole was oriented towards skilled jobs. The mean occupational interest profiles of the groups did not differ significantly. A higher proportion of the disadvantaged children were reported as being unemployed shortly after leaving school. It is concluded that there was a serious mismatch between the career aspirations of some of the disadvantaged group and their prospects. Ways in which this might be reduced through better school careers guidance and education programmes are briefly considered.