Dark-adaptation mechanisms of the long-wave foveal cones

The ordinary long-term rod and cone dark-adaptation curves have generally been assumed to follow a single exponential rate of recovery. However, in two previous papers on rod dark-adaptation (Stabell et al., 1986a, b), the recovery curve was found to consist of three different sections. The results of the present paper show the same type of recovery function with three different sections for the long-term dark-adaptation curve of the long-wave cone system. During the major, middle section log cone threshold, like log rod threshold, is linearly related to the logarithm of the concentration of bleached photopigment. Presupposing that the bleached cone photopigment acts as a ligand, the change in threshold level obtained during the middle section of the dark-adaptation curve is well described by the change in activity rate of an allosteric, postively cooperative enzyme built as a dimer.     

Long-term rod dark adaptation in man. Threshold measurements, rhodopsin regeneration and allosteric sensitivity regulation. An evaluation

Recent evidence strongly suggests that the relationship between threshold elevation ( T ) and fraction of bleached rhodopsin ( B ), obtained during a major, middle period of long-term rod dark adaptation in man, is well described by a power function, i. e., T = k · Bⁿ , where k is a multiplicative constant and n is the exponent. Due primarily to the low reliability of measurements of rhodopsin regeneration, however, the exponent n of the power function cannot, at present, be given an exact value. Available information indicates that the value of the exponent ranges between 2.4 and 4. Implications of this uncertainty are discussed within the framework of the allosteric, tetrameric model of rod dark adaptation. It is concluded that this model in its simplest form may only offer a first approximation of the real system implicated in the process.     

Problems in contemporary psychoanalytic theory: 1. Controversial issues

In two articles the controversial situation within contemporary psychoanalytic theory is discussed with reference to both the form and content of the theory. In the first article some areas of theoretical conflict between traditional drive theory, on the one hand, and object relations theory, self theory, and ego theory, on the other, are surveyed. It is concluded that inconsistency and ambiguity seem so penetrating that one can hardly speak of a unified theory of psychoanalysis at present. This seems to be a new situation in the history of psychoanalysis. A main issue of disagreement is that between drive theory and object relations theory concerning the nature of human motivation. In order to bridge the theoretical gap between the two positions, it seems necessary for psychoanalysis to disclaim the monolithic status of the drives and to adopt a broad theory of motivation where drives are only one contribution among several types of motivating forces. In the second article some lines of advance in psychoanalytic theory are discussed.     

Chromatic rod vision VII. Intensity of pre-stimulation varied

Stabell, B. & Stabell, U. Chromatic rod vision. VII. Intensity of pre-stimulation varied. Scand. J. Psychol., 1973, 14, 12–15.-Change in scotopic hue with variation of intensity of pre-stimulation was predicted on the basis of Hering's opponent theory of color, but the experimental results could not be adequately explained within the framework of the theory.     

Dark adaptation of the long-wave cones at different eccentricities

Using a Wright colorimeter the ordinary long-term, long-wave cone dark-adaptation curve was measured at 0, 2, 4, 7, 17, 25, 40 and 49 degrees nasally in the visual field. In opposition to previous findings, the results show that the dark-adaptation function of the long-wave cones changes markedly when the test field is moved outward from the rod-free fovea. It is suggested that the kinetics of the long-wave cone photopigment change with eccentricity. Also, at variance with previous findings, the present curves at all eccentricities may reasonably well be interpreted as consisting of three different sections; a first section where the threshold decreases rapidly, followed by a major, approximately linear section and a terminating section that converges asymptotically towards the final level of sensitivity. This finding suggests that the dark-adaptation process of the cone system, under the given experimental conditions, is based on three somewhat different processes.     

Memory in schizophrenia and affective disorders*

The purpose of the present study was to investigate the stability of memory and information processing in schizophrenics and affectively disturbed patients. Twenty-two schizophrenics, eight affectives and 14 normal controls were tested twice, with an interval of approximately one year. Results showed that normals performed better than schizophrenics and affectively disturbed patients on almost all of the cognitive measures. The differences reached a level of significance on a reaction time test, a vigilance task and a long-term memory task. The only measure where the difference did not reach a level of significance was on a short-term memory test. Groups' performance to some extent changed over time on most of the measures, but the changes were not significantly different for different groups.     

The psychological health of employed and unemployed recent graduates as a function cognitive appraisal and of coping

In the literature on the effects of unemployment on graduates two competing hypothesis have found support. On one hand graduates have higher expectations about status and occupational identity, hence being unemployed should be more distressing. On the other hand graduates have access to more personal and situational resources and should cope better with the stress of unemployment. In a study of 181 recent graduates it was found that those who were employed (n = 88) scored higher on both somatization and interpersonal sensitivity than those who were unemployed (n = 93). A large percentage also reported not being in the job to which they aspired and scored low on job commitment. The unemployed graduates had a more positive approach to problem-solving, higher achievement motivation, more perceived social support, were more assertive, and felt less hopeless than their employed peers. They also engaged in more constructive leisure activities than the employed group. The data provide tentative support for the hypothesis that graduates are better at coping with unemployment. However the indication is that any advantage to be gained is relative to the type of job occupied by the employed group to whom they are compared. The general conclusion is that opting for a job which does not meet expectations or aspirations may be more psychologically damaging in the short term than being unemployed and hopeful. This is a function of the individual's vulnerability or resistance to stress and highlights the need for graduates to be prepared more effectively for the path to a career.     

Generalized Anxiety Disorder: Connections With Self-Reported Attachment

Even though generalized anxiety disorder (GAD) is one of the most common of the anxiety disorders, relatively little is known about its precursors. Bowlby's attachment theory provides a framework within which these precursors can be considered. According to Bowlby, adult anxiety may be rooted in childhood experiences that leave a child uncertain of the availability of a protective figure in times of trouble. Furthermore, adult “current state of mind with respect to attachment” is thought to relate to adult anxiety. Both attachment-related components were assessed with 8 subscales of the Perceptions of Adult Attachment Questionnaire (PAAQ). Clinically severe GAD clients who were about to begin therapy reported experiencing less maternal love in childhood, greater maternal rejection/neglect, and more maternal role-reversal/enmeshment than did control participants. In keeping with a cumulative risk model, risk for GAD increased as indices of poor childhood attachment experience increased. GAD clients, in contrast to controls, also reported greater current vulnerability in relation to their mothers as well as more difficulty accessing childhood memories. Logistic regression analyses revealed that elevations on PAAQ subscales could significantly predict GAD vs. non-GAD status. Results and the implications for advancing the theory and treatment of GAD are discussed.     

Bullying and victimisation in school children: the role of social identity, problem-solving style, and family and school context

The relationship between social identity, family and school context, problem-solving style, self-esteem, health behaviour, psychological distress, and victimisation, was explored in a quasi-experimental survey of 461 children aged between 11 and 15 years old. There was a high prevalence of victimisation (29%) in the group and 44% of those victimised scored above the clinical cut-off on the GHQ. Victims exhibited higher levels of psychological distress, lower self-esteem, more unhealthy behaviours, less support from parents and teachers, poorer problem-solving styles, and lower perceived social identity. Girls had a higher prevalence of victimisation than boys. The best predictors of victimisation were sex, family situation, social identity and problem-solving style. Some implications for interventions are discussed.

THE STUDY AND TREATMENT OF MOTHERS AND INFANTS,THEN AND NOW: MELANIE KLEIN'S “NOTES ON BABY” IN A CONTEMPORARY PSYCHOANALYTIC CONTEXT

This paper draws on Melanie Klein's (unpublished) observational notes of her infant grandson, written primarily in 1938 and 1939. Apart from moving glimpses into a young family's life, the notes contain astute observations of an infant's behavior and emotions. Compared with Klein's published writings, the style is less theoretical and polemical. Later, in his latency years, Klein's grandson was in analysis with Marion Milner, who in 1952 published a paper drawing on the treatment. The present paper focuses on (1) how observations and treatment of the same child and his family by clinicians in close relationships with each other (Klein, Milner, and Winnicott) fertilized reciprocal influence but also brought into question the validity of Klein's observations, and (2) the relative merits and contributions of various modalities in understanding the infant's psyche, including experimental research, direct observation, parent–infant psychotherapy, and reconstructions from older patients—as occurs, for example, in psychoanalysis.