The rapid development of explicit gaze judgment ability at 3 years

Two studies examined development of the ability to judge what another person is looking at. In Study 1, 54 2- to 4-year-olds judged where someone was looking in real-life, photograph, and drawing formats. A minority of 2-year-olds, but a majority of older children, passed all tasks, suggesting that the ability arises at around 3 years of age. Study 2 examined the fine-grained gaze judgment of 76 3- to 6-year-olds and 15 adults using gaze differences of 10° and 15°. Development of gaze judgment was gradual, from chance at 3 years of age to near adult-level performance at 6 years of age. Although performance was better when a congruent head turn was included, 3-year-olds were still at chance on 10° head turn trials. The findings suggest that the ability to explicitly judge gaze is novel at 3 years of age and develops slowly thereafter. Therefore, the ability does not develop out of earlier gaze following. General implications for the evolution and development of gaze processing are discussed.     

VII—A Compleat Chain of Reasoning: Hume's Project inA Treatise of Human Nature, Books One and Two

In this paper I consider the context and significance of the first instalment of Hume's A Treatise of Human Nature , Books One and Two, on the understanding and on the passions, published in 1739 without Book Three. I argue that Books One and Two taken together should be read as addressing the question of the relation between reason and passion, and place Hume's discussion in the context of a large early modern philosophical literature on the topic. Hume's goal is to show that the passions do not require government by reason, and to illustrate various ways in which the passions of social beings regulate themselves. The underlying theme of the first Treatise is thus a new theory of sociability: sympathetic sociability.     

Intersubjectivity,object relations theory,and empirical evidence from mother-infant interactions

The work of John Bowlby and his associates on the development of the infant's attachment to his or her parents in the second half of the first year reflects the fruitfulness of an integration of psychoanalytic insights and empirical research. In line with this approach, this paper considers the mother-infant relationship in the first few months from two perspectives: that of the British School of Object Relations and that of the theory of Intersubjectivity, set out initially within developmental psychology and, more recently, developed within systems theory. These views are considered in the light of evidence from two sources. First, a series of experimental studies is described employing disruptions to both the form and the timing of communication between 6- to 12-week-old infants and their mothers. This work illustrates the sensitivity of young infants to the quality of their interpersonal engagements and, also, the contribution of the infant to the regulation of interactions with others. Second, evidence is presented from a prospective study of the effects of maternal depression in the postnatal period on infant development. This work shows the possible longer term consequences for the infant of early disturbances in the mother-infant relationship. Infants of postnatally depressed women were found to be more insecurely attached to their mothers, were more likely to have mild behavioral problems (especially sleep disturbance), and showed poorer outcome on Object Concept tasks at 18 months. These effects occurred despite the fact that the mother had recovered from depression by 3 months postpartum.     

Spontaneous head positions in infants during the first 9 postnatal months

The developmental organization of spontaneous head positioning over the first 9 postnatal months of life was investigated in a study of 35 infants. Head positions assumed by infants while at rest were recorded at 11 observation period: at 1 week, 2 weeks, 4 weeks of age, and every 4 weeks thereafter until the infant was 36 weeks old. Results indicated an overall tendency toward a head-right position, which was strongest during the neonatal period, but declined with age. The head-right position bias was qualified by familial handedness.     

Depression and Mortality in the Elderly

It is well known that depression can be a consequence of medical illness and disability, but a growing literature suggests also that depression can cause biological changes linked to morbidity and mortality. Depression is strongly implicated as a contributor to cardiovascular disease and mortality. Using the cascade-to-death model as a conceptual framework, we explore the complex relations among behavior, affect, motivation, and pathophysiology that might account for the association between depression and premature death. Our model suggests that some individuals become entrapped in a downward spiral in which behavior, medical illness, and depressive affect feed on each other to undermine the biological integrity of the organism. In addition to specifying behavioral and biological mechanisms linking depression to mortality, future research needs to more closely examine phenomenological aspects of depression in order to determine what aspects of depression and related constructs such ashopelessness, vital exhaustion, and motivational depletion account for the link between depression and mortality.     

An apparatus for studying operant activity of captive coyotes

We describe a portable apparatus designed to examine the free-operant food preferences of captive coyotes in their home kennels. Because leverpressing for food access was the dependent variable, we measured food preference independently of food ingestion. Using successive approximation, we trained 8 out of 19 coyotes (42%) to use the apparatus. This percentage is similar to training rates for dogs. We used fixed and variable ratio schedules of reinforcement to further test 4 of the trained coyotes. All 4 produced response curves similar to those of other species on similar schedules of reinforcement.     

Supplementary Fit,Complementary Fit,and Work‐Related Outcomes: The Role of Self‐Construal

The current research investigated whether employees' self‐construals moderated the effects of supplementary fit and complementary fit on their work‐related outcomes (i.e. affective commitment and citizenship behavior). An organisational sample of 317 Chinese employees provided evidence that the relations between supplementary fit and these two work‐related outcomes were stronger among employees with a higher interdependent self‐construal. Conversely, the relations between complementary fit and work‐related outcomes were stronger among employees with a higher independent self‐construal. Theoretical and practical implications of these findings are discussed.