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PubMed1989

An odyssey of the green sea turtle: Ascension Island revisited.

Green turtles (Chelonia mydas) that nest on Ascension Island, in the south-central Atlantic, utilize feeding grounds along the coast of Brazil, more than 2000 km away. To account for the origins of this remarkable migratory behavior, Carr and Coleman [Carr, A. & Coleman, P. J. (1974) Nature (London) 249, 128-130] proposed a vicariant biogeographic scenario involving plate tectonics and natal homing. Under the Carr-Coleman hypothesis, the ancestors of Ascension Island green turtles nested on islands adjacent to South America in the late Cretaceous, soon after the opening of the equatorial Atlantic Ocean. Over the last 70 million years, these volcanic islands have been displaced from South America by sea-floor spreading, at a rate of about 2 cm/year. A population-specific instinct to migrate to Ascension Island is thus proposed to have evolved gradually over tens of millions of years of genetic isolation. Here we critically test the Carr-Coleman hypothesis by assaying genetic divergence among several widely separated green turtle rookeries. We have found fixed or nearly fixed mitochondrial DNA (mtDNA) restriction site differences between some Atlantic rookeries, suggesting a severe restriction on contemporary gene flow. Data are consistent with a natal homing hypothesis. However, an extremely close similarity in overall mtDNA sequences of surveyed Atlantic green turtles from three rookeries is incompatible with the Carr-Coleman scenario. The colonization of Ascension Island, or at least extensive gene flow into the population, has been evolutionarily recent.

Journal Article↗
PubMed1996

Hypothalamic integration of body fluid regulation.

The progression of animal life from the paleozoic ocean to rivers and diverse econiches on the planet's surface, as well as the subsequent reinvasion of the ocean, involved many different stresses on ionic pattern, osmotic pressure, and volume of the extracellular fluid bathing body cells. The relatively constant ionic pattern of vertebrates reflects a genetic "set" of many regulatory mechanisms--particularly renal regulation. Renal regulation of ionic pattern when loss of fluid from the body is disproportionate relative to the extracellular fluid composition (e.g., gastric juice with vomiting and pancreatic secretion with diarrhea) makes manifest that a mechanism to produce a biologically relatively inactive extracellular anion HCO3- exists, whereas no comparable mechanism to produce a biologically inactive cation has evolved. Life in the ocean, which has three times the sodium concentration of extracellular fluid, involves quite different osmoregulatory stress to that in freshwater. Terrestrial life involves risk of desiccation and, in large areas of the planet, salt deficiency. Mechanisms integrated in the hypothalamus (the evolutionary ancient midbrain) control water retention and facilitate excretion of sodium, and also control the secretion of renin by the kidney. Over and above the multifactorial processes of excretion, hypothalamic sensors reacting to sodium concentration, as well as circumventricular organs sensors reacting to osmotic pressure and angiotensin II, subserve genesis of sodium hunger and thirst. These behaviors spectacularly augment the adaptive capacities of animals. Instinct (genotypic memory) and learning (phenotypic memory) are melded to give specific behavior apt to the metabolic status of the animal. The sensations, compelling emotions, and intentions generated by these vegetative systems focus the issue of the phylogenetic emergence of consciousness and whether primal awareness initially came from the interoreceptors and vegetative systems rather than the distance receptors.

Animals↗
PubMed1997

Behavioral effects of estrogen receptor gene disruption in male mice.

Gonadal steroid hormones regulate sexually dimorphic development of brain functions and behaviors. Their nuclear receptors offer the opportunity to relate molecular events in neurons to simple instinctive mammalian behaviors. We have determined the role of estrogen receptor (ER) activation by endogenous estrogen in the development of male-typical behaviors by the use of transgenic estrogen-receptor-deficient (ERKO) mice. Surprisingly, in spite of the fact that they are infertile, ERKO mice showed normal motivation to mount females but they achieved less intromissions and virtually no ejaculations. Aggressive behaviors were dramatically reduced and male-typical offensive attacks were rarely displayed by ERKO males. Moreover, ER gene disruption demasculinized open-field behaviors. In the brain, despite the evident loss of functional ER protein, the androgen-dependent system appears to be normally present in ERKO mice. Together, these findings indicate that ER gene expression during development plays a major role in the organization of male-typical aggressive and emotional behaviors in addition to simple sexual behaviors.

Aggression↗
PubMed1999

Walter Rudolf Hess (1881-1973) and his contribution to neuroscience.

The present account includes a brief life history of Walter Rudolf Hess (1881-1973) and a review of his major neurophysiological contributions. Hess belonged to the nearly extinct generation of great universalists among students of human physiology. He began his scientific work in hemodynamics and ophthalmology, then studied the functional organization and regulation of circulation and respiration and developed a number of highly sophisticated instruments which fostered his international reputation. By electrically stimulating the brain of the unanesthetized, freely moving animal he explored the functional organization and localization of the cat diencephalon in terms of autonomic, extrapyramidal motor functions, and instinctive behavior, e.g. hunger, thirst, fear, and rage. His thoughts on biological order led him to consider the problems of psychic forces. He was convinced of the close correlation of behavioral research and neurophysiology and believed that neuronal patterns determine the content of consciousness without providing clues concerning the transformation of such patterns into subjective experience.

History, 20th Century↗
PubMed1999

Hume on the nonhuman animal.

Hume wrote about fundamental similarities and dissimilarities between human and nonhuman animals. His work was centered on the cognitive and emotional lives of animals, rather than their moral or legal standing, but his theories have implications for issues of moral standing. The historical background of these controversies reaches to ancient philosophy and to several prominent figures in early modern philosophy. Hume develops several of the themes in this literature. His underlying method is analogical argument and his conclusions are generally favorable regarding the abilities in animals. Hume does not attribute a moral sense or capacity of judgment to animals, but he does suggest that their actions exhibit moral qualities, such as other-regarding instincts. Hume allows in-kind differences in both demonstrative reason and moral judgment, but in the domains of both causal reason and moral agency he believes there are differences of degree rather than of kind. Hume's most significant philosophical contribution was to move as far as anyone before him to a naturalistic explanation of human and nonhuman minds that invited psychological and epistemological examination of minds by using the identical methods and categories for man and beast.

Animal Welfare↗
PubMed2005

Helping individuals to help themselves.

Obesity is a serious and increasing health issue. Approximately two-thirds of adults in the UK are now overweight or obese. Recent public health reports firmly reinforce the importance of engaging individuals to look after their health, including their weight. They also spell out the need for individuals to be supported more actively, on many levels, to enable this 'engagement'. Meanwhile, national surveys indicate that approximately two-thirds of adults are concerned about weight control, with one-third actively trying to lose weight. This finding is hardly surprising considering current weight statistics, plus the plethora of popular diets on offer. Weight-loss methods include diet clubs, diet books, exercise, meal replacements, advice from healthcare professionals and following a self-styled diet. Obesity is a multi-factorial problem, and losing weight and, in particular, maintaining weight loss is difficult and often elusive. It is argued that the modern obesogenic or 'toxic' environment has essentially taken body-weight control from an instinctive 'survival' process to one that needs sustained cognitive and skill-based control. The evidence suggests that health professionals can help individuals achieve longer-term weight control by supporting them in making sustainable lifestyle changes using a range of behavioural techniques. These techniques include: assessing readiness to change; self-monitoring; realistic goal setting; dietary change; increased physical activity; stimulus control; cognitive restructuring; relapse management; establishing ongoing support. Consistently working in a client-centred way is also being increasingly advocated and incorporated into practice to help motivate and encourage, rather than hinder, the individual's progress.

Cognitive Behavioral Therapy↗
PubMed1993

Decision-making style, driving style, and self-reported involvement in road traffic accidents.

In an exploratory postal survey of 711 drivers stratified by age, sex, annual mileage, and accident involvement, decision-making style was measured using a Decision-Making Questionnaire (DMQ) and driving style was assessed using a Driving Style Questionnaire (DSQ). Responses to 21 items of the DMQ formed seven independent and internally coherent dimensions according to a principal components (PC) analysis. These were labelled: control, thoroughness, instinctiveness, social resistance, hesitancy, perfectionism, and idealism. PC analysis also revealed that responses to 15 items of the DSQ formed six independent dimensions of driving style. These were labelled: speed, calmness, social resistance, focus, planning, and deviance. Multiple regression analysis indicated that drivers of 60 years and under who scored lower on thoroughness were at greater risk of a traffic accident and that this relationship was mediated by faster driving. This relationship was independent of age, sex, annual mileage and all other factors measured. In the drivers over 60 years, lower thoroughness, greater hesitancy, and faster driving were independently associated with higher accident rates independent of all other factors measured. The results provide preliminary support for the view that people import aspects of their general decision-making style into the driving situation, and that in so doing they put themselves at differential risk of having a road traffic accident.

Accidents, Traffic↗
PubMed2003

History, causality, and sexology.

In 1896, Krafft-Ebing published Psychopathia Sexualis. Popularly defined as hereditary weakness or taintedness in the family pedigree, degeneracy was called upon as a causal explanation for perversions of the sexual instinct. Although Krafft-Ebing accepted Karl Ulrichs proposal that homosexuality could be innate and probably located in the brain, he paid little attention to neuropathological sexology. Alfred Binet challenged Krafft-Ebing's orthodoxy by explaining fetishism in terms of associative learning, to which Krafft-Ebing's response was that only those with a hereditary taint would be vulnerable. Thus did the venerable nature-nurture antithesis maintain its rhetoric, even to the present day. Krafft-Ebing died too soon to meet the Freudian challenge of endopsychic determinism, and too soon also to encounter the idea of a developmental multivariate outcome of what I have termed the lovemap. Like other brain maps, for example the languagemap, the lovemap requires an intact human brain in which to develop. The personalized content of the lovemap has access to the brain by way of the special senses.

Austria↗
PubMed1976

Thanatos--a reevaluation.

Freud's most controversial tenet is the death instinct. Although it appears full blown in 1920, it was doubtless nurtured for years in his mind. In its indissoluble relation to the repetition compulsion and Nirvana principle, Thanatos is the bedrock of much of Freud's later philosophy. This paper is an examination of the motivations for the idea, an exegesis of Freud's writings on the subject, and a review of critical opinion.

Austria↗
PubMed1985

On speaking to oneself.

This essay is an attempt to pull together a multiplicity of phenomena variously called "private speech," "egocentric speech," "self-communicative speech," "self-guiding speech" or "soliloquy" within a unified perspective. I will attempt to demonstrate that soliloquy consists of 3 basic components: a "regressive" component involved with the release of raw emotional energy, an "intrapersonal" component concerned with structuring and sustaining cognition, and an "interpersonal" component directed toward communicating with others. An example of what can be called "regressive soliloquy" is the instinctive cry of a newborn baby or the involuntary curse of a person who has just struck his thumb with a hammer. An "intrapersonal soliloquy" is exemplified by the person who has looked up a telephone number in the directory and repeats it to himself for better retention as he prepares to dial the telephone, while "interpersonal soliloquy" is illustrated by one's rehearsal of a speech destined for public delivery.

Acoustic Stimulation↗
PubMed1989

Darwinian evolution of social behavior: implications for group psychotherapy.

Medicine typically looks to biology for guidance in examining complexity. Application of biological principles to social processes has not been easy. Still, we need not abandon biology in the study of complex social phenomena. Biologists have come to view the study of proximate form and function (revealed by disciplines such as anatomy, psychology and physiology) versus the study of how the form and function ultimately "got to be" (revealed by disciplines such as ethology and sociobiology) as distinct and complementary levels of understanding (Lorenz 1981; Mayr 1982). Though we cannot undertake in this paper explication of the value of understanding the ultimate, as well as the proximate, in studying biological phenomena, interested readers will find a comprehensive discussion in Mayr. The evolutionary principles structuring social interactions are becoming understood and hold promise as a biologically valid system for organizing and guiding the study of complex social behaviors (Essock-Vitale and Fairbanks 1979; Kofoed and MacMillan 1987). Psychological processes have evolved in varying complexities as mechanisms to enable and guide social behavior, increasing the probability that such behavior will be adaptive in a wide variety of circumstances (Trivers 1971). Dynamic and social psychologies describe the proximate internal and interactive intricacies that have resulted from this process but cannot help us understand the goals evolution has "naturally designed" (Thompson 1986) these mechanisms to achieve. The hypothesized drives or instincts underlying most psychological models, often derived from a simplistic understanding of evolutionary theory, are usually simply taken for granted in the development of these models.(ABSTRACT TRUNCATED AT 250 WORDS)

Biological Evolution↗
PubMed1996

Primary attachment in female adolescents: association with depression, self-esteem, and maternal identification.

DURING the past two decades, infant and child research has accumulated considerable support for John Bowlby's views on the importance of early attachment experience (1958, 1969, 1973, 1980, 1988). Briefly stated, Bowlby's theory conceptualized infant-mother attachment as a primary instinct, separate from other physiological needs (such as hunger or sex), and serving the purpose of continuing proximity to a caregiver. Children generate "internal working models of attachment" that influence the organization of their attachment-seeking behaviors (Bowlby 1980). During childhood these models are being actively and continuously constructed by the child. Toward the end of adolescence, however, they tend to become stable and serve as a template for later attachments throughout the life cycle. Narrative reconstruction of these attachment models by young adults recalling their childhood can be considered as a dynamic "summary statement" regarding the child's attempts and caregiver's responses in the maintenance of attachment bonds, rather than as verifiable facts (Main and Kaplan 1985).

Adolescent↗
PubMed1982

The causes of whale strandings.

Strandings of cetaceans (whales and dolphins) is probably the result of a sequence of events rather than a simple cause-and-effect relationship. Strandings of solitary animals are more common than massed and generally thought to be due to severe disease. Mass strandings (three to several hundred individuals) are less common, but very spectacular. Mass strandings are considered to be due to a complex of factors in which behavioural factors are probably important, severe disease making an unimportant, or negligible contribution. There may be interaction of physical conditions (weather, tides, currents, coastline) and biological conditions (predators, feeding, disturbance of echolocation and disease) which result in stranding. One postulated reason for stranding is that it is dependent on instinctive behaviour, deeply located in subcortical areas of the brain, which provokes cetaceans to seek refuge ashore when under stress.

Journal Article↗
PubMed1993

The theoretical contributions of Hans W. Loewald.

An integration and dialectical reading of Hans Loewald's developmental theory is offered, demonstrating his ability to bridge theoretical dualisms. He maintains yet revises Freud's structural model and dual instinct theory in a way which embraces developmental and relational perspectives.

Austria↗
PubMed2003

Validity and the OSCE.

In preparation for a celebration of '30 years of OSCEs' held during the 2002 meeting of the Association for Medical Education in Europe (AMEE), I was asked to discuss the question, 'Are OSCEs valid to assess competence?". My first instinct was to review work undertaken in ay countries by famous researchers such as Harden, Colliver, Rothman, van der Vleuten, Stillman, Tamblyn and others who have studied and written about the validity of OSCEs. I could then have reviewed the extensive literature produced in Canada by the Medical Council of Canada and in the United States by the Education Commission on Foreign Medical Graduates and National Board of Medical Examiners that has demonstrated the utility of large-scale OSCEs for certification and licensure. I might have tossed in a few papers from my own research on the validity of OSCEs in psychiatry. Indeed, it would have been relatively easy to marshal the medical education literature to answer the question 'Are OSCEs valid to assess competence' strongly in the affirmative. But the more I reflected on the question, the more I confronted concerns that have troubled me for some time. Specifically, I worry that our approaches to validity may themselves not be valid. In this paper, I review what I believe to be three serious problems with our current approaches to showing that 'the OSCE is valid' Let me begin by rethinking the question. What do we mean 'Is the OSCE valid for assessing competence' There are three important problems with this question. First, validity is a property of the application of a test, not of a test itself. Second, we cannot speak of validity without giving consideration to the context in which we use the test. And finally, the concept of validity flounders because the OSCE itself is an important agent in constructing the variables of performance that it is designed to measure. I shall consider each issue in turn.

Canada↗
PubMedDate not supplied

Breaking the silence of African American women: healing after pregnancy loss.

African American women experience pregnancy and infant losses at rates twice those of European American women and women of other recognized ethnic and racial groups. Health professionals, families, and friends tend to avoid discussions of these losses because grief following pregnancy or infant loss is frequently considered insignificant. Bereaved mothers whose grief is unrecognized are likely to have grief responses that are exaggerated in intensity and duration. In this article I reflect part of a larger qualitative study in which I explored the pregnancy-related experiences of 10 African American women. The purpose of this article is to describe the perceived strategies these women used to heal after pregnancy or infant loss. Individual interviews were conducted using open-ended questions. Grounded theory methodology was used to analyze the data. The healing strategies used by the participants reflect predominately inner and instinctive processes, resources, and remedies. Culturally appropriate strategies for health care interventions and research activities are offered.

Abortion, Legal↗
PubMed2003

Unheralded sudden cardiac death: do autonomic tone and thrombosis interact as key factors in aetiology?

Unheralded sudden cardiac death is a personal and family tragedy that continues to elude research-based progress on aetiology or prevention. Instinctive links between autonomic imbalance, sympathetic activation and serious arrhythmia are longstanding and backed by many observational reports. However the role of the more familiar mechanisms of coronary occlusion and thrombus formation are underplayed. Sympathetic overactivity may also mediate sudden death through precipitation of vasospasm; platelet activation and inhibition of endogenous fibrinolysis as well as the propagation of arrhythmia. The integration of autonomic, thrombotic and vascular tone may be the key to better understanding of the individual process of unheralded sudden cardiac death. In this review we analyse the evidence for this hypothesis.

Animals↗
PubMed2000

Sources of information used by patients to learn about chemotherapy side effects.

BACKGROUND: Little is known about the relative importance of specific information sources patients use to obtain knowledge about treatment side effects. The authors examined information sources used to learn about side effects, why patients believe they will experience some but not others, and the meanings side effects have in terms of treatment efficacy. METHODS: Before treatment, 31 ovarian cancer patients and 81 men and women with a variety of cancer diagnoses completed a questionnaire assessing their expectations about experiencing specific side effects of chemotherapy and information sources used. RESULTS: The doctor or nurse was the most frequently cited source of side-effect information, with readings second. While most thought they would get certain side effects because the doctor or nurse had said so, most instinctively believed they would not get others. CONCLUSIONS: Patients relied on medical and non-medical information sources. Further research could examine other sources for their influences on information-seeking activities.

Aged↗