We examined the affective consequences of everyday attention lapses and memory failures. Significant associations were found between self-report measures of attention lapses , attention-related cognitive errors , and memory failures , on the one hand, and boredom and depression , on the other. Regression analyses confirmed previous findings that the ARCES partially mediates the relation between the MAAS-LO and MFS. Further regression analyses also indicated that the association between the ARCES and BPS was entirely accounted for by the MAAS-LO and (...) MFS, as was that between the ARCES and BDI-II. Structural modeling revealed the associations to be optimally explained by the MAAS-LO and MFS influencing the BPS and BDI-II, contrary to current conceptions of attention and memory problems as consequences of affective dysfunction. A lack of conscious awareness of one’s actions, signaled by the propensity to experience brief lapses of attention and related memory failures, is thus seen as having significant consequences in terms of long-term affective well-being. (shrink)

Is synaesthesia cognitively useful? Individuals with time–space synaesthesia experience time units as idiosyncratic spatial forms, and report that these forms aid them in mentally organising their time. In the present study, we hypothesised that time–space synaesthesia would facilitate performance on a time-related cognitive task. Synaesthetes were not specifically recruited for participation; instead, likelihood of time–space synaesthesia was assessed on a continuous scale based on participants’ responses during a semi-structured interview. Participants performed a month-manipulation task, which involved naming every second month (...) or every third month in reverse-chronological order, beginning and ending with a target month. Using hierarchical multiple regression, we found that time–space synaesthesia corresponded with faster performance on both versions of the task. We propose that time–space synaesthesia may expedite the cognitive manipulation of time-based information. Our results also indicate that synaesthesia is far less unusual than widely believed. (shrink)

Variant Creutzfeldt–Jakob disease is a fatal, transmissible, neurodegenerative disorder for which there is currently no effective treatment. vCJD arose from the zoonotic spread of bovine spongiform encephalopathy. There is now compelling evidence for human to human transmission through blood transfusions from presymptomatic carriers and experts are warning that the real epidemic may be yet to come. Imperatives exist for the development of reliable, non-invasive presymptomatic diagnostic tests. Research into such tests is well advanced. In this article the ethical implications of (...) the availability of these tests are elaborated and comparisons drawn with predictive genetic testing for Huntington’s disease and screening for HIV. Paramount to considerations is the issue of whom to test, weighing up respect for personal autonomy against obligations to benefit and protect society. A paradigm is proposed similar to that used for HIV screening but with unique features: compulsory testing of all blood/organ donors and individuals undergoing surgery or invasive procedures who have a significant risk of disease transmission. (shrink)

To most laypersons and scientists, science and progress appear to go hand in hand, yet philosophers and historians of science have long questioned the inevitability of this pairing. As we take leave of a century acclaimed for scientific advances and progress, Science at Century's End, the eighth volume of the Pittsburgh-Konstanz Series in the Philosophy and History of Science, takes the reader to the heart of this important matter. Subtitled Philosophical Questions on the Progress and Limits of Science, this timely (...) volume contains twenty penetrating essays by prominent philosophers and historians who explore and debate the limits of scientific inquiry and their presumed consequences for science in the 21st century. (shrink)

This paper explores some of the basic similarities and differences between fault-based and no-fault systems of automobile accident insurance from the perspective of a U.S. state and the laws of Macedonia. The majorities of U.S. states have adopted an at-fault system of compensation and therefore share more similarities with Macedonia than the laws of a dozen U.S. states that have adopted a no-fault system. Whereas Macedonia employs a system of nearly universal health care, such is not the case in the (...) United States. The respective states have adopted either a fault-based system or a no-fault system, but in either case issues of coverage for automobile accidents is more complicated for the lack of a nationalized health care system that at minimum acts as a safety net for treatment of injuries related to automobile accidents. It is posited that complications relating to the lack of universal health care coverage in the United States has led to significantly heightened regulatory intervention by the several states such that the similarities between the free-market approach of the states and of civil law (code) systems are greater than the differences. The paper is not based on empirical data of the legal systems or the medical systems, nor is the undeniable interrelation between a medical system and the corresponding legal system with regard to insurance coverage of primarily health-based issues considered other than to highlight how both may play a part in regulation of the automobile accident insurance industry in light the involvement of public health, safety and welfare. (shrink)

D.T. a 35-year-old woman, was found to have breast cancer. At the time of mastectomy axillary lymph nodes were positive and the cancer was classified as adenocarcinoma, grade 4. The patient underwent conventional chemotherapy. When it became apparent the disease was metastatic, the patient's oncologist contacted a well-known cancer center regarding the possibility of treating the patient with high dose chemotherapy and autologous bone marrow transplantation. The patient's health insurance provider informed the patient, however, that the treatment—estimated to cost in (...) the range of $150,000–200,000—was “considered experimental or research in nature” and therefore was not included in coverage. D.T. did not pursue this further. Approximately 2 years later, cancer was detected in the patient's spine. This time she applied to another well-known cancer center for HDC/ABMT. The cancer center agreed to accept her on the condition of proof of ability to pay for the treatment. Again her insurer refused coverage on the same grounds as before. D.T. found another source for the money, underwent treatment, then sued the insurance carrier. She sought a declaratory judgment that the treatment was covered under the insurance policy. The court ruled in favor of D.T. finding the contract phrase “considered experimental” ambiguous. (shrink)

T. J. Clark’s two early books, The Absolute Bourgeois: Artists and Politics in France, 1848–1851 and Image of the People: Gustave Courbet and the 1848 Revolutio.

In the 1980s, when the American art market flourished, critics were heavily concerned with theory. In T_he Aesthete in the City_ David Carrier offers a personal view on the artistic activity of that decade. He begins with a theoretical perspective on the relationship between two very different forms of artwriting: art criticism and art history writing. Carrier surveys the developments within theory during the 1980s, focusing on constructive critical analysis of the then fashionable work of Jean Baudrillard, Walter (...) Benjamin, T. J. Clark, and Jacques Derrida. He provides detailed accounts of a number of painters, among them Thomas Nozkowski, David Reed, and Sean Scully, whose development he followed closely. Carrier argues that the greatest American artistic tradition,Expressionism, provides the basis for an ongoing tradition of abstract painting, a rich system whose potential has not yet been exhausted. Carrier's earlier work was concerned with a philosophical study of the methods of art criticism. This book turns to the theory and practice of art criticism, concentrating on a concrete discussion of individual theorists and artists. (shrink)

There are a variety of interpretations of Manet's Un Bar auxFolies Bergères, but there is no genuinely neutral standpoint from which to judge their seemingly opposed accounts. T. J. Clark's analysis involves placing the work in the context of critical commentary by the artist's contemporaries, and examining the exact place and role of the mirror. Just as Manet painted two versions of the picture, so Clark has published two analyses of it; and just as we can ask whether the artist (...) thus resolved the ambiguities of his first image, so an analogous question can be asked about Clark's commentaries. When we have two such pictures or texts, how do we understand their relationship? Perhaps the best way is to find a further commentary. A Lacanian interpretation is proposed. We may see in the picture a triangular structure of perception; between the gaze and the subject stands the screen on which the image is cast. This view, even more speculative than Clark's, offers a new suggestive way of grasping the relation between picture and texts interpreting it. (shrink)

Uncoupling proteins (UCPs) regulate mitochondrial function, and thus cellular metabolism. Angiotensin‐converting enzyme (ACE) is the central component of endocrine and local tissue renin–angiotensin systems (RAS), which also regulate diverse aspects of whole‐body metabolism and mitochondrial function (partly through altering mitochondrial UCP expression). We show that ACE expression also appears to be regulated by mitochondrial UCPs. In genetic analysis of two unrelated populations (healthy young UK men and Scandinavian diabetic patients) serum ACE (sACE) activity was significantly higher amongst UCP3‐55C (rather than (...) T) and UCP2 I (rather than D) allele carriers. RNA interference against UCP2 in human umbilical vein endothelial cells reduced UCP2 mRNA sixfold (P < 0·01) whilst increasing ACE expression within a physiological range (<1·8‐fold at 48 h; P < 0·01). Our findings suggest novel hypotheses. Firstly, cellular feedback regulation may occur between UCPs and ACE. Secondly, cellular UCP regulation of sACE suggests a novel means of crosstalk between (and mutual regulation of) cellular and endocrine metabolism. This might partly explain the reduced risk of developing diabetes and metabolic syndrome with RAS antagonists and offer insight into the origins of cardiovascular disease in which UCPs and ACE both play a role. (shrink)

Confidentiality is a cornerstone of the physician-patient relationship. Breaches of confidentiality in the context of genetic testing are of particular concern for a number of reasons. First, genetic testing reveals information not only about a particular patient, but also about his or her family members. Second,genetic testing can label healthy people as “at risk,” subjecting them to possible stigmatization or discrimination by third parties. Third, as genetic testing becomes more widespread and is incorporated into primary care, breaches of confidentiality might (...) inadvertently occur more frequently because primary care providers may not be trained to understand the uniqueness of genetic information. Until now, genetic services have been provided primarily by medical geneticists and genetic counselors. However, with the proliferation of new genetic presymptomatic and carrier tests, primary care physicians are going to become increasingly involved in genetic testing. Currently, little is known about physicians’ attitudes toward disclosure of confidential genetic information to third parties. (shrink)

Confidentiality is a cornerstone of the physician-patient relationship. Breaches of confidentiality in the context of genetic testing are of particular concern for a number of reasons. First, genetic testing reveals information not only about a particular patient, but also about his or her family members. Second,genetic testing can label healthy people as “at risk,” subjecting them to possible stigmatization or discrimination by third parties. Third, as genetic testing becomes more widespread and is incorporated into primary care, breaches of confidentiality might (...) inadvertently occur more frequently because primary care providers may not be trained to understand the uniqueness of genetic information. Until now, genetic services have been provided primarily by medical geneticists and genetic counselors. However, with the proliferation of new genetic presymptomatic and carrier tests, primary care physicians are going to become increasingly involved in genetic testing. Currently, little is known about physicians’ attitudes toward disclosure of confidential genetic information to third parties. (shrink)

Extensive research has demonstrated that rs1360780, a common single nucleotide polymorphism within the FKBP5 gene, interacts with early-life stress in predicting psychopathology. Previous results suggest that carriers of the TT genotype of rs1360780 who were exposed to child abuse show differences in structure and functional activation of emotion-processing brain areas belonging to the salience network. Extending these findings on intermediate phenotypes of psychopathology, we examined if the interaction between rs1360780 and child abuse predicts resting-state functional connectivity (rsFC) between the amygdala (...) and other areas of the salience network. We analyzed data of young European adults from the general population (N = 774; mean age = 18.76 years) who took part in the IMAGEN study. In the absence of main effects of genotype and abuse, a significant interaction effect was observed for rsFC between the right centromedial amygdala and right posterior insula (p <.025, FWE-corrected), which was driven by stronger rsFC in TT allele carriers with a history of abuse. Our results suggest that the TT genotype of rs1360780 may render individuals with a history of abuse more vulnerable to functional changes in communication between brain areas processing emotions and bodily sensations, which could underlie or increase the risk for psychopathology. (shrink)

It is known that Wittgenstein enjoyed reading Plato; but the significance the philosopher had for him is quite underrated, and has never been properly understood. Utilizing insights by Ortega and E. Havelock, the paper argues that while the background of Plato's philosophy was the emergence of literacy, the genesis and the direction of Wittgenstein's later philosophy, by contrast, is not independent of the emergence of post-literacy (or "secondary orality", to use Walter J. Ong's term). A post-literal phenomenon clearly having specifc (...) impact on Wittgenstein was the film: it is striking that he regularly used the film metaphor to illustrate philosophical points. Analyzing these metaphors the paper reaches the conclusion that according to Wittgenstein the carrier of uncorrupted meaning is, actually, spoken language; if we leave the rein to written language, philosophical problems will arise. (shrink)

Reproductive genetic carrier screening is increasingly being offered more widely, including to people with no family history or otherwise elevated chance of having a baby with a genetic condition. There are valid reasons to reject a prevention-focused public health ethics approach to such screening programs. Rejecting the prevention paradigm in this context has led to an emphasis on more individually-focused values of freedom of choice and fostering reproductive autonomy in RCS. We argue, however, that population-wide RCS has sufficient features (...) in common with other public health screening programs that it becomes important also to attend to its public health implications. Not doing so constitutes a failure to address the social conditions that significantly affect people’s capacity to exercise their reproductive autonomy. We discuss how a public health ethics approach to RCS is broader in focus than prevention. We also show that additional values inherent to ethical public health—such as equity and solidarity—are essential to underpin and inform the aims and implementation of reproductive carrier screening programs. (shrink)

distraction that leads innocent Post Keynesians into “classical sin.” Davidson (1994, 1996) argues that core Post Keynesian (PK) ideas such as that insufficient aggregate demand arise from fundamental uncertainty in a monetary economy do not depend on nonlinearity or complexity, that these core concepts are axiomatically and ontologically true, and that the inability of agents to forecast well in dynamically complex situations reflects mere epistemological problems of insufficient computational abilities. Thus complex dynamics is merely a classical stalking horse. This writer (...) (Rosser, 1990, 1998, 2001) disagrees with the argument presented above and its relatives (Mirowski, 1990; Carrier, 1993). Dynamic complexity provides a foundation for fundamental uncertainty in Keynesian and PK models, and this applies to most of the various sub-branches of PKE besides Davidson’s “fundamentalist” or “Keynes-Post Keynesian”2 approach. The argument will be considered regarding three subdivisions of Post Keynesianism as identified by Hamouda and Harcourt (1988): the aforementioned fundamentalist Keynesianism, Sraffian (or neo-Ricardian), and Kaleckian (or Kaleckian- Robinsonian).3 Following King (2002, chap. 10), I admit to being more in sympathy with those he describes as “synthesizers” than with the more partisan sectarians of these approaches.4 I shall describe how each sub-branch has been analyzed using ideas of.. (shrink)

Large scale experiments at CERN’s Large Hadron Collider rely heavily on computer simulations, a fact that has recently caught philosophers’ attention. CSs obviously require appropriate modeling, and it is a common assumption among philosophers that the relevant models can be ordered into hierarchical structures. Focusing on LHC’s ATLAS experiment, we will establish three central results here: with some distinct modifications, individual components of ATLAS’ overall simulation infrastructure can be ordered into hierarchical structures. Hence, to a good degree of approximation, hierarchical (...) accounts remain valid at least as descriptive accounts of initial modeling steps. In order to perform the epistemic function Winsberg Model-based reasoning in scientific discovery. Kluwer Academic/plenum Publishers, New York, pp 255–269, 1999) assigns to models in simulation—generate knowledge through a sequence of skillful but non-deductive transformations—ATLAS’ simulation models have to be considered part of a network rather than a hierarchy, in turn making the associated simulation modeling messy rather than motley. Deriving knowledge-claims from this ‘mess’ requires two sources of justification: holistic validation :253–262, 2010; in Carrier M, Nordmann A Science in the context of application. Springer, Berlin, pp 115–130, 2011), and model coherence. As it turns out, the degree of model coherence sets HEP apart from other messy, simulation-intensive disciplines such as climate science, and the reasons for this are to be sought in the historical, empirical and theoretical foundations of the respective discipline. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Vessel of Honor: The Virgin Birth and the Ecclesiology of Vatican II by Brian A. GraebeAaron Pidel S.J.Vessel of Honor: The Virgin Birth and the Ecclesiology of Vatican II. By Brian A. Graebe (Steubenville, OH: Emmaus Academic, 2021), 351 pp.Though Mary's undiminished virginity in giving birth (virginitas in partu) was long understood to be an event as miraculous and a teaching as authoritative as her virginity in conceiving (...) (virginitas ante partum), virginitas in partu underwent a kind of existential reinterpretation in the middle of the twentieth century. Authors such as Albert Mitterer and Karl Rahner suggested that, physically speaking, Jesus's birth might have happened like any other, rupturing the hymen, distending the birth canal, and causing Mary pain, albeit not in the spiritually disintegrating way common to postlapsarian humanity. These arguments effectively "unsettled" the traditional understanding of virginitas in partu, leading theologians of the highest stature to distinguish between the doctrine itself and the anatomical aspects attached to it over time. Fr. Brian Graebe has written a fine book arguing that the bodily dimensions of the virgin birth, including the physical "seal" of virginity, belong to the substance of the doctrine. This more inclusive understanding not only does better justice to the data of tradition, he argues, but illuminates the ecclesiology of the Second Vatican Council. The book impresses by its theologically reflective method, its clarity of exposition, [End Page 1106] and its depth of research—especially into the archival and antepreparatory sources of Vatican II.Vessel of Honor responds in effect to Rahner's argument that physical intactness is peripheral to the dogmatic core of Mary's virginity in partu. To show otherwise, Rahner contended, one would need to show that such a doctrine can be found directly in the apostolic teaching, or that it, "being implicitly contained therein, has grown out of the apostolic doctrine, by a legitimate historical, logical, and theological process, as its authentic development" (68–69). If the bodily aspects of this doctrine really belonged to the deposit of faith, in other words, one would need to show how they are implied in the traditio divino-apostolica, as well as how they cohere organically with the rest of the deposit. The two major parts of Vessel of Honor respond in turn to each aspect of Rahner's challenge.The first three chapters argue that Mary's bodily integrity in parturition belongs at least implicitly to the traditio divino-apostolica. Turning first to the postapostolic tradition, Fr. Graebe shows that—apart from the early exceptions of Origen and Tertullian—patristic sources either affirm or strongly imply a miraculous delivery. This constant witness culminates in the Lateran Council (649 AD), which, while not itself an ecumenical council, was received into the magisterium of Pope Martin and affirmed by the Third Council of Constantinople (680 AD). Its teaching that Mary "gave birth without corruption" (incorruptibiliter... genuisse) would be defended by Paschasius, Ratramnus, Thomas Aquinas, and others. This consensus remained undisturbed until the eve of Vatican II.Even at Vatican II, Fr. Graebe argues in the next chapter, the Council Fathers intended to reaffirm the more inclusive idea of virginitas in partu against those who would marginalize its bodily dimensions. Here he really breaks new ground, delving deep into the antepreparatory, preparatory, and conciliar drafting history. He shows convincingly that many of the chief drafters of the final formula—"Our Lord, who did not diminish his mother's virginal integrity but sanctified it..." (Lumen Gentium §57)—saw it as excluding Rahner's and Mitterer's minimalizing interpretations. Drawing on material from the Vatican Apostolic Archives, Fr. Graebe shows that some of the very theologians who voted to omit the pointed phrase "in the birth itself" (in ipsomet partu) did so for tonal rather than substantive reasons.The third chapter argues that Mary's physical integrity in birth is to be believed with divine and Catholic faith, despite the ongoing confusion introduced by Rahner and others. Admittedly, Vatican II did not define but merely reaffirmed the traditional understanding of virginitas in partu. But there are other reasons for including it in the traditio divino-apostolica. [End Page 1107] Drawing heavily... (shrink)

What does the world's engagement with the unfolding crisis in Darfur tell us about the impact of the Iraq war on the norm of humanitarian intervention? Is a global consensus about a “responsibility to protect” more or less likely? There are at least three potential answers to these questions. Some argue that the merging of strategic interests and humanitarian goods amplified by the intervention in Afghanistan makes it more likely that the world's most powerful states will act to prevent or (...) halt humanitarian crises. Others insist that the widespread perception that the United States and its allies “abused” humanitarian justifications to legitimate its invasion of Iraq has set back efforts to build a global consensus about humanitarian action. A third group argues that the “responsibility to protect” inhibits the potential for abuse and, as a result, consensus is likely to strengthen post-Iraq for precisely this reason. Through a detailed study of the international engagement with Darfur, I suggest that the latter two arguments have merit but need to be adjusted. I argue that the humanitarian intervention norm has changed in two subtle ways. First, while the strength of the norm itself has not changed, the credibility of the United States and U.K. as “norm carriers” has been significantly undermined. Second, while the “responsibility to protect” has been invoked to support international activism, it has also re-legitimated anti-interventionist arguments. (shrink)

When I read, rather belatedly, Professor Davison's article on Theognis 257–66 in C.R. ix , 1–5, I found myself remembering somewhat uncomfortably that I have an article awaiting publication in Mnemosyne in which I present a new interpretation of Theognis 1209–16 as a griphos. Against Carriere, Davison remarks that it would be easier to accept 261–6 as a griphos ‘if there were any serious evidence for the prevalence of in the Theognidean corpus’ ; this is an eminently sane attitude and (...) leaves the question open for later consideration. But lower on the same page E. Harrison's dictum that ‘sweeping emendations’ are ‘the last infirmity of exegesis’ has given birth to a pronouncement that ‘recourse to riddles’ is one of two ‘penultimate infirmities of academic minds’. This is really too much. I have not yet acquired a fixation on this subject, but I am sufficiently impenitent to maintain that the griphos appears at least twice in the corpus, at 1209–16 and 261–6. I have no opinion on 257–60, which seems at any rate to be in its proper place. (shrink)

Le débat sur l’existence réelle du point a occupé une place importante dans les débats philosophiques parisiens du deuxième quart du xive siècle. La contribution de Jean Buridan à ce débat est bien connue mais à ce jour, l’identité d’un certain « magister M. de Montescalerio », adversaire réaliste de Buridan et auteur d’une Determinatio de puncto, est restée inconnue. Cet article établit l’identité de cet important maître actif vers 1340 à la faculté des arts de Paris et en retrace (...) la carrière. (shrink)

Consideration is given to some strategies to combat Huntington's disease in the absence of treatment to arrest its progress. Ethical issues for tests such as levodopa loading, to provoke symptoms prematurely in carriers of the gene, are compared with those associated with schemes for delaying the onset of disease. The major drawback of these designs is the uncertainty that prodromal symptoms may be extended unduly and the severity of deferred symptoms worsened. Some attention is also given to the possible use (...) of post-onset plans to reduce illness severity and prolong survival. It is concluded that the characteristics of persons less prone to undesirable consequences of onset-delay should be adequately investigated before attempting to implement such schedules as a practical measure. (shrink)

Several studies have reported impairment in the recognition of facial expressions of disgust in patients with Huntington's disease (HD) and preclinical carriers of the HD gene. The aim of this study was to establish whether impairment for disgust in HD patients extended to include the ability to express the emotion on their own faces. Eleven patients with HD, and 11 age and education matched healthy controls participated in three tasks concerned with the expression of emotions. One task assessed the spontaneous (...) production of disgust-like facial expressions during the smelling of offensive odorants. A second assessed the production of posed facial expressions during deliberate attempts to communicate emotion. The third task evaluated HD patients’ ability to imitate the specific facial configurations associated with each emotion. Foul odours induced fewer disgust-like facial reactions in HD patients than in controls, and patients’ posed facial expressions of disgust were less accurate than the posed disgust expressions of controls. The effect was selective to disgust; patients had no difficulty posing expressions of other emotions. These impairments were not explained by compromised muscle control: HD patients had no difficulty imitating the facial movements required to display disgust. Viewed together with evidence of difficulty in other aspects of disgust in HD, the findings suggest that a common substrate might participate in both the processing and the expression of this emotion. (shrink)

Introduction -- Tending the dark fire: the Boehmian notion of drive -- The night-side of nature: the early Schellingian unconscious -- The speculative psychology of dissociation: the later Schellingian unconscious -- Schellingian libido theory.

Background Empirical studies of surrogate decision-making tend to assume that surrogates should make only a 'substituted judgement'—that is, judge what the patient would want if they were mentally competent. Objectives To explore what people want in a surrogate decision-maker whom they themselves select and to test the assumption that people want their chosen surrogate to make only a substituted judgement. Methods 30 undergraduate students were recruited. They were presented with a hypothetical scenario about their expected loss of mental capacity in (...) the future and asked to answer some questions about their choice of surrogate. These data were analysed qualitatively using thematic content analysis. Results Most respondents talked about choosing someone who was caring and competent in certain ways, giving interesting evidence for their judgements. Surprisingly few highlighted how well they thought their chosen surrogate knew their preferences and would be able to make a substituted judgement. Moreover, few specified that their chosen surrogate had similar attitudes and values to their own and so would make a similar decision to theirs in the circumstances presented. Some respondents also referred to the social role of their chosen surrogate or the social dynamics of their situation which influenced their choices, as well as to ideas of reciprocity and characteristics of honesty and loyalty. Conclusion In the event that they lose mental capacity, many people will not select a surrogate to decide about medical treatments on their behalf solely on the basis that they expect their surrogate to make a substituted judgement. (shrink)

Tunneling oscillations induced in a double quantum well by a monochromatic electromagnetic wave incident perpendicularly to the plane of the well, and polarized along the direction of its growth, are treated. For the wave frequency in proximity to the energy difference between two states of opposite symmetry, a periodic energy exchange between the wave and a carrier which moves from one energy state to the other is established. When the carrier starts from the low energy level it borrows (...) energy from the wave until it reaches the higher energy state. On its way the carrier performs current oscillations that cease whenever it reaches an eigenstate. Similarly, oscillation is required during the carrier's motion from the high to the low energy state for the photon emission in order that the radiation gets back the energy already given to the carrier. Thus an accelerating charge not only radiates, but also absorbs wave energy. When there prevails a considerable population difference between the two levels the possibility of quantum beat exits. (shrink)