Influences on communicative development at 24 months of age: child temperament, behaviour problems, and maternal factors

Within a longitudinal study using a large representative, community sample of infants recruited at mean age 8 months, we examined influences on infant communication development at 24 months, including child gender, shy temperament, behavioural and emotional problems, and several variables relating to maternal psychosocial health. On most developmental measures girls were in advance of boys and they also showed shyer temperament. Child gender, shy temperament and maternal psychosocial indices were associated with both vocabulary development as measured by the MacArthur-Bates Communicative Development Inventory (CDI), and communication and symbolic development assessed via the Communication and Symbolic Behaviour Scales-Developmental Profile (CSBS) at 24 months. No prediction was found using scores at 8 or 12 months, although moderate stability between measures between 12 and 24 months was evident. Predictors of 24 month outcomes were all concurrently measured variables, and included temperamental shyness, but very little variance in communication outcomes was explained. Children whose mothers were experiencing clinical levels of depression and life difficulties reported more child behavioural problems.     

Transition to motherhood: A longitudinal study

A prospective longitudinal study assessed the development of the mother-child relationship within the context of other important aspects of transition to parenthood. In the prenatal phase, 238 women who were 8 months pregnant with their first child completed a set of questionnaires. At 1 month post-partum, 165 of these women completed a second set of questionnaires, and a subset of 86 were observed for 1 hour at home with their infants. When their child was 2 years old, 62 of the 86 mothers completed questionnaires and were observed in interaction with their toddler in the laboratory. The several hundred individual variables were reduced to internally consistent composite variables, 5 in the prenatal phase, 7 postpartum, and 14 in the toddler phase. Preliminary analyses reported in this paper assessed the structure of relationships among the composite variables within each phase (Pearson correlations) and whether there was significant prediction from one dimension to another across the phases, beyond stability in the predicted dimension (multiple regressions). Causal modeling analyses are still in progress. The results indicate that the development of maternal attachment is a gradual process and that feelings of attachment are related to a number of other measures of women's psychological well-being. Parenting confidence was found to play a central role in adaptation to motherhood within each phase, as well as from the prenatal to postpartum and postpartum to toddler phases.     

Speaking for the baby: A therapeutic intervention with adolescent mothers and their infants

Adolescent mothers frequently experience problems in mother-infant interaction. However, intervention can be very difficult, particularly when complicated by unresolved conflicts involving relationships in the young woman's past. This article describes a therapeutic intervention, based on the work of Fraiberg, which allows the young mother to learn to interpret her infant's cues while also encouraging her to express her own emotions in the context of the mother-infant relationship. Two case studies are discussed to illustrate the use of the technique as part of a program of mother-infant intervention.     

Adaptive procedures in psychophysical research

As research on sensation and perception has grown more sophisticated during the last century, new adaptive methodologies have been developed to increase efficiency and reliability of measurement. An experimental procedure is said to be adaptive if the physical characteristics of the stimuli on each trial are determined by the stimuli and responses that occurred in the previous trial or sequence of trials. In this paper, the general development of adaptive procedures is described, and three commonly used methods are reviewed. Typically, a threshold value is measured using these methods, and, in some cases, other characteristics of the psychometric function underlying perceptual performance, such as slope, may be developed. Results of simulations and experiments with human subjects are reviewed to evaluate the utility of these adaptive procedures and the special circumstances under which one might be superior to another.     

The analysis of orientation-dependent time costs in visual recognition

How does the visual system recognise stimuli presented at different orientations? According to the multiple-views hypothesis, misoriented objects are matched to one of several orientation-specific representations of the same objects stored in long-term memory. Much of the evidence for this hypothesis comes from the observation of group mean orientation effects in recognition memory tasks showing that the time taken to identify objects increases as a function of the angular distance between the orientation of the stimulus and its nearest familiar orientation The aim in this paper is to examine the validity of this interpretation of group mean orientation effects. In particular, it is argued that analyses based on group performance averages that appear consistent with the multiple-views hypothesis may, under certain circumstances, obscure a different theoretically relevant underlying pattern of results. This problem is examined by using hypothetical data and through the detailed analysis of the results from an experiment based on a recognition memory task used in several previous studies. Although a pattern of results that is consistent with the multiple-views hypothesis was observed in both the group mean performance and the underlying data, it is argued that the potential limitations of analyses based solely on group performance averages must be considered in future studies that use orientation effects to make inferences about the kinds of shape representations that mediate visual recognition.     

The horizon-ratio relation as information for relative size in pictures

The horizon-ratio relation was found to be an effective source of information for relative size in pictures under some conditions: when the difference in image size of depicted “same real size” objects was not too great (Experiment 1), and when the horizon line was not too high or too low in the picture (Experiment 2). The latter finding seemed to be linked to the observers’ identification of the horizontal line as the horizon (and not as the edge of a finite surface). In addition, individual patterns of response were remarkably systematic even in the absence of a horizon, or any other pictorial information, (Experiment 3). It is suggested that in this case observers imposed a horizon on the picture on which to base their relative size judgments, possibly based on the observer’s own eye level or on the content of the picture. It is concluded that although the horizon-ratio relation provides the same kind of information as that available in the optic arrays from real scenes, pictorial information requires the satisfaction of additional constraints in order to be fully effective.     

Appraising the unusual: Framing effects and moderators of uniqueness-seeking and social projection

In this paper, we examine people’s appraisals of unusual objects and their intuitions about whether others will like those objects. Prior work suggests uniqueness motives (e.g., Need for Uniqueness) affect appraisals, but the effect of these motives on projection of appraisals to others is unclear. Contrary to some prior work, we argue that uniqueness motives do not govern projection of appraisals but rather that individual differences in perceived similarity to a target group do. We also show that perceptions of uniqueness are partly constructed and susceptible to framing, holding all other object properties constant. In two studies, we confirm our predictions about the effects on uniqueness motives and perceived similarity on appraisals and social projection of those appraisals.