We approach the physics of \emph{minimal coupling} in general relativity, demonstrating that in certain circumstances this leads to violations of the \emph{strong equivalence principle}, which states that, in general relativity, the dynamical laws of special relativity can be recovered at a point. We then assess the consequences of this result for the \emph{dynamical perspective on relativity}, finding that potential difficulties presented by such apparent violations of the strong equivalence principle can be overcome. Next, we draw upon our discussion of (...) the dynamical perspective in order to make explicit two `miracles' in the foundations of relativity theory. We close by arguing that the above results afford us insights into the nature of special relativity, and its relation to general relativity. (shrink)

" In 'Vagueness and Alternative Logic' (Realism and Reason, Cambridge 1983, pp. 271-86, especially 285-6), Hilary Putnam puts forward a suggestion for a formal treatment of the logic of vagueness. … Putnam admits that, at the time of writing, he had not thought this idea through. What will already be apparent to the alert reader is that, in order to disclose serious difficulties for the proposal, Putnam would not have had to think far.".

Darwinian evolution, defined as evolution arising from selection based directly on the properties of individuals, does not account for cultural constructs providing the organizational basis of human societies. The difficulty with linking Darwinian evolution to structural properties of cultural constructs is exemplified with kinship terminologies, a cultural construct that structures and delineates the domain of kin in human societies. (Published Online November 9 2006).

[B]ecause I have shown my hands to be empty you must now expect not only that an illusion will follow but that you will acquiesce in it.Nothing is so difficult as not deceiving oneself.What has to be overcome is not difficulty of the intellect but of the will.“Are you watching closely?”The last line of Parfit’s description of the “branch-line case” of tele-transportation, the very epicenter of his hugely influential thought experiment that famously proposes a radically new view on “personal identity,” (...) runs as follows: “[W]hile I stand here speechless, I can see and hear myself, in the studio on Mars, starting to speak.”1 Parfit, notoriously, goes on to argue that the “branch-line” version of me, the “I” in the.. (shrink)

Dummett argues that there are difficulties with existing accounts of time, and urges us to consider the merits of his alternative ‘constructionist’ account. He derides my opting out of the debate between him and his Realist opponents as “quietist”. But the epithet “quietist” only works if there actually is some genuine topic on which I am staying quiet (or silencing others). Whereas I simply urge that, while Dummett has correctly identified difficulties with Realist accounts of time, he does (...) not have any valid reason for opposing those accounts—and such valid reason can only come from a radically different approach which questions whether those accounts or any alternatives to them can satisfy those who wish to put them forward. I argue that at best such accounts present fragments of ‘the grammar’ of time, in a rather misleading form. (shrink)

One of the motivations for Salmon's (1984) causal theory of explanation was the explanatory irrelevance exhibited by many arguments conforming to Hempel's covering-law models of explanation. However, the nexus of causal processes and interactions characterized by Salmon is not rich enough to supply the necessary conception of explanatory relevance. Salmon's (1994) revised theory, which is briefly criticized on independent grounds, fares no better. There is some possibility that the two-tiered structure of explanation described by Salmon (1984) may be pressed into (...) service, but more work would have to be done. Ironically, Salmon's difficulties are similar to those suffered by his seventeenth-century predecessors. (shrink)

Causation is a topic of perennial philosophical concern. As well as being of intrinsic interest, almost all philosophical concepts — such as knowledge, beauty, and moral responsibility — involve a causal dimension. Nonetheless, attempts to provide a satisfactory account of the nature of causation have typically led to barrages of counterexamples. I hope to show that a number of the difficulties plaguing theories of causation have a common source.Most philosophical theories of causation describe a binary relation between cause and (...) effect, or at any rate, a relation that reduces to such a binary relation when certain background information is held fixed. Indeed, most theories provide the same general account of when this relation holds: in order to evaluate whether C causes E, we must make a comparison between two cases, which we may neutrally label as C and ∼C. Where theories of causation differ, of course, is in precisely what is being so compared. Regularity theories of causation require a comparison between what actually happens whenever C occurs, and what actually happens, elsewhere and elsewhen, when C does not occur. (shrink)

A scientific community can be modeled as a collection of epistemic agents attempting to answer questions, in part by communicating about their hypotheses and results. We can treat the pathways of scientific communication as a network. When we do, it becomes clear that the interaction between the structure of the network and the nature of the question under investigation affects epistemic desiderata, including accuracy and speed to community consensus. Here we build on previous work, both our own and others’, in (...) order to get a firmer grasp on precisely which features of scientific communities interact with which features of scientific questions in order to influence epistemic outcomes. (shrink)

Intentional verbs create three different problems: problems of non-existence, of indeterminacy, and of failure of substitutivity. Meinongians tackle the first problem by recognizing non-existent objects; so too did many medieval logicians. Meinongians and the medievals approach the problem of indeterminacy differently, the former diagnosing an ellipsis for a propositional complement, the latter applying their theory directly to non-propositional complements. The evidence seems to favour the Meinongian approach. Faced with the third problem, Ockham argued bluntly for substitutivity when the intentional complement (...) is non-propositional; Buridan developed a novel way of resisting substitutivity. Ockham's approach is closer to the Meinongian analysis of these cases; Buridan's seems to raise difficulties for a referential semantics. The comparision between the Meinongian and medieval approaches helps to bring out merits and potential pitfalls of each. (shrink)

Distinguishing between the source and the locus of value enables environmental philosophers to consider not only what is of value, but also to try to develop a conception of valuation that is itself ecological. Such a conception must address difficulties caused by the original locational metaphors in which the distinction is framed. This is done by reassessing two frequently employed models of valuation, perception and desire, and going on to show that a more adequate ecological understanding of valuation emerges (...) when these models are fully contextualized in the intersecting life worlds of the ecological community. Ecological evaluation takes place in ongoing encounters between these worlds and a crucial part in this process is assigned to living beings that are “open-endedly open,” that is, open not only to what the world affords them and others, but open to an indefinite field of possible valuational encounters between all kinds of beings. Ecological valuation overcomes some of the conceptual failings of contemporary attempts to evaluate nature: “The Economics of Ecology and Biodiversity” and “Valuing Nature.”. (shrink)

Salmon has argued that science provides explanations by describing a causal nexus: For Salmon, this nexus is a network of processes and interactions. I argue that this picture of the causal nexus is insufficient for an account of scientific explanation: a taxonomy of causal relevance is also needed. ;Probabilistic theories of causation seem to provide such a taxonomy in their dichotomy between promoting and inhibiting causes. However, standard probabilistic theories are beset by a difficulty called the problem of disjunctive factors. (...) According to such theories, an effect is more probable in the presence of a cause than in its absence . But there are many ways in which a particular cause may come about, and many in which it may be absent; these ways need not confer the same probabilities upon the effect. Thus, there is no direct comparison of two probabilities to be made. My solution is to abandon the oversimplified dichotomy between promoting and inhibiting causes. Causal claims convey qualitative information about more complex probabilistic relationships. Interestingly, this picture of causation meshes naturally with extant theories of explanation. ;I show how this framework may be employed in resolving several outstanding problems in the theories of causation and explanation, such as the relationship between singular and general causal claims, and the role of contrastive stress in causal and explanatory claims. ;Finally, I show how my account of causal explanation can be connected with the semantic conception of scientific theories. According to this conception, a theory is characterized in terms of a class of mathematical models. I describe the relationship between these mathematical models and the probabilistic relationships that are described by causal explanations. These ideas are illustrated in an extended discussion of causation and explanation in evolutionary theory. (shrink)

Generally speaking, scientific explanation has been a topic of lively discussion in twentieth‐century philosophy of science; philosophers of science have endeavored to characterize rigorously a number of different types of explanation to be found in the various fields of scientific research. Given the indispensability of statistical concepts and techniques in virtually every branch of modern science, it is natural to ask whether some scientific explanations are essentially statistical or probabilistic in character. The answer would seem to be yes. For example, (...) we can explain why atoms of carbon 14 have a 1/4 probability of surviving for 11,460 years because the half‐life of that species is 5,730 years. As we shall see, explanations of this type are not especially problematic. As another example, we might explain why a particular weed withered by citing the fact that it received a dose of a herbicide, even though we know that the herbicide is not invariably effective. This means that the withering is related probabilistically to the herbicide treatment but is not necessitated by it. Explanations of this kind, by contrast, lead to severe difficulties. (shrink)

Dynamic Assessment (DA) has been shown to have more predictive value than conventional tests for academic performance. However, in relation to reading difficulties, further research is needed to determine the predictive validity of DA for specific aspects of the different processes involved in reading and the differential validity of DA for different subgroups of students with an academic disadvantage. This paper analyzes the implementation of a DA device that evaluates processes involved in reading (EDPL) among 60 (...) students with reading comprehension difficulties between 9 and 16 years of age, of whom 20 have intellectual disabilities, 24 have reading-related learning disabilities, and 16 have socio-cultural disadvantages. We specifically analyze the predictive validity of the EDPL device over attitude towards reading, and the use of dialogue/participation strategies in reading activities in the classroom during the implementation stage. We also analyze if the EDPL device provides additional information to that obtained with a conventionally applied personal-social adjustment scale (APSL). Results showed that dynamic scores, obtained from the implementation of the EDPL device, significantly predict the studied variables. Moreover, dynamic scores showed a significant incremental validity in relation to predictions based on an APSL scale. In relation to differential validity, the results indicated the superior predictive validity for DA for students with intellectual disabilities and reading disabilities than for students with socio-cultural disadvantages. Furthermore, the role of metacognition and its relation to the processes of personal-social adjustment in explaining the results is discussed. (shrink)

ObjectivesTo document the auditory processing, visual attention, digit memory, phonological processing, and receptive language abilities of individual children with identified word reading difficulties.DesignTwenty-four children with word reading difficulties and 28 control children with good word reading skills participated. All children were aged between 8 and 11 years, with normal hearing sensitivity and typical non-verbal intelligence. Both groups of children completed a test battery designed to assess their auditory processing, visual attention, digit memory, phonological processing, and (...) receptive language.ResultsWhen compared to children who were good readers, children with word reading difficulties obtained significantly lower average scores on tests of auditory processing, including the frequency pattern test, gaps in noise, frequency discrimination, Dichotic Digit difference Test, and Listening in Spatialized Noise. The two groups did not differ on the discrimination measures of sinusoidal amplitude modulation or iterated rippled noise. The results from children with word reading difficulties showed that 5 children (21%) had comorbid deficits in auditory processing, visual attention, and backward digit memory; whereas 12 children (50%) had comorbid auditory processing and visual attention deficits only, and 2 children (8%) had comorbid deficits in auditory processing and digit memory; the remaining children had only auditory processing, visual attention, or digit memory deficits.ConclusionThe current study highlights the general co-existence of auditory processing, memory, and visual attention deficits in children with word reading difficulties. It is also noteworthy, however, that only one fifth of the current cohort had deficits across all measured tasks. Hence, our results also show the significant individual variability inherent in children with word reading difficulties. (shrink)

In the Questions on charity in the ST, Aquinas considers at length the vices opposed to charity, omitting altogether any Question on a vice opposed to mercy. What does the omission reveal about mercy and its difficulties? First, I reject ready-to-hand explanations of the omission. Second, I consider the relation between mercy and compassion, showing that for Thomas the primary impediments to compassion are less vices than psychological forces irreducible to any single vice. Third, I turn to a different (...) set of obstacles to mercy – acts that can arise from compassion, but do not help the person in need. Given these difficulties, how can Thomas take the practice of virtuous mercy to be generally possible? I conclude with a discussion of suffering and the gift of wisdom. (shrink)

People with OCD are generally unusually intelligent, and they tend to do well on standardized tests, especially tests of reading comprehension. But OCD often makes it extraordinarily difficult for such people to read. It is here explained why this is so and how to deal with it.

The current study aimed to investigate the extent to which familial history of reading and math difficulties have an impact on children’s academic outcomes within a 3-year longitudinal study, which evaluated their core reading and math skills after first and second grades, as well as performance on complex academic tasks after second and third grades. At baseline, parents were asked to complete the Adult Reading History Questionnaire and its adaption, Adult Math History Questionnaire, to index familial (...) history of reading and math difficulties, respectively. Preliminary findings established the psychometric properties of the AMHQ, suggesting that it is a reliable and valid scale. Correlation analyses indicated that the ARHQ was negatively associated with children’s reading skills, whereas the AMHQ was negatively related to math outcomes. Path results revealed that the ARHQ predicted children’s performance on complex reading tasks indirectly via their core reading skills, and the AMHQ was linked to complex math outcomes indirectly via core math abilities. The ARHQ was also found to be negatively correlated with measures of children’s math performance, with path findings suggesting that these relations were indirectly explained by differences in their core reading skills. These results suggest that assessing familial risk for academic difficulties may be crucial to understanding comorbid etiological and developmental associations between reading and math differences. (shrink)

These essays in political philosophy by T. M. Scanlon, written between 1969 and 1999, examine the standards by which social and political institutions should be justified and appraised. Scanlon explains how the powers of just institutions are limited by rights such as freedom of expression, and considers why these limits should be respected even when it seems that better results could be achieved by violating them. Other topics which are explored include voluntariness and consent, freedom of expression, tolerance, punishment, and (...) human rights. The collection includes the classic essays 'Preference and Urgency', 'A Theory of Freedom of Expression', and 'Contractualism and Utilitarianism', as well as a number of other essays that have hitherto not been easily accessible. It will be essential reading for all those studying these topics from the perspective of political philosophy, politics, and law. (shrink)

Many studies have attempted to identify measures that predict reading abilities. The results of these studies may be inclined to over-identification of children considered at risk in kindergarten but who achieve parity in reading by the end of first grade. Therefore, the current study sought to analyze the specific cognitive and linguistic predictors of reading accuracy and reading speed separately. Additionally, the study examined if it is possible to use empirically validated measures to distinguish between children (...) who are not ready to learn how to read in kindergarten but manage to acquire reading skills by the end of first grade, and those who continue to exhibit difficulties. The study followed 98 kindergarteners aged 4 years 10 months to six years from three different schools, who were taught how to read in kindergarten. Multiple measures of general cognitive skills, linguistic abilities, and reading abilities were measured at three different points in time: the beginning of kindergarten, the end of kindergarten, and the end of first grade. The study found that most of the children with good literacy and cognitive abilities learned how to read by the end of kindergarten. The analysis revealed a significant difference in cognitive abilities, such as executive functions and memory, which distinguished between the ability to acquire fluent reading and accurate reading. The study was able to successfully distinguish between “children with difficulties” and “un-ready” children. These results have various implications, especially in regard to the identification of and intervention with kindergarten children at risk for reading disabilities. (shrink)

The aim of the study was to develop a new comprehensive reading assessment battery for multi-ethnic and multilingual learners in Malaysia. Using this assessment battery, we examined the reliability, validity, and dimensionality of the factors associated with reading difficulties/disabilities in the Malay language, a highly transparent alphabetic orthography. In order to further evaluate the reading assessment battery, we compared results from the assessment battery with those obtained from the Malaysian national screening instrument. In the study, 866 (...) Grade 1 children from multi-ethnic and multilingual backgrounds from 11 government primary schools participated. The reading assessment battery comprised 13 assessments, namely, reading comprehension, spelling, listening comprehension, letter name knowledge, letter name fluency, rapid automatized naming, word reading accuracy, word reading efficiency, oral reading fluency, expressive vocabulary, receptive vocabulary, elision, and phonological memory. High reliability and validity were found for the assessments. An exploratory factor analysis yielded three main constructs: phonological-decoding, sublexical-fluency, and vocabulary-memory. Phonological-decoding was found to be the most reliable construct that distinguished between at-risk and non-at-risk children. Identifying these underlying factors will be useful for detecting children at-risk for developing reading difficulties in the Malay language. In addition, these results highlight the importance of including a range of reading and reading-related measures for the early diagnosis of reading difficulties in this highly transparent orthography. (shrink)

A growing body of research suggests that children with autism spectrum disorder are at risk of reading and learning difficulties. However, there is mixed evidence on their weaknesses in different reading components, and little is known about how reading skills characterize in ASD. Thereby, the current study aimed to systematically review the research investigating this function in children with ASD. To this purpose, we reviewed 24 studies that compared children with ASD and children with typical development (...) in word and nonword reading performance, children with ASD and normative data of word and nonword reading tests, and the results obtained by children with ASD in word and nonword reading tests. Most of the comparisons contrasting the reading performance of children with ASD and children with TD did not find significant differences between groups in both word and nonword reading. However, all the comparisons that reported standardized results showed that children with ASD had scores that fell within population norms. Regarding the third comparison of interest, about 54% of the studies presented data for both word and nonword reading, but only one study tested the difference between them and showed that children with ASD had higher levels of word than of nonword reading. Despite these results, the heterogeneous and small samples do not allow to draw sound conclusions regarding the strategies that children with ASD use to read words. As consequence, the nature of reading difficulties presented by children with ASD are still unknown, requiring future research conducted with larger and well-characterized samples of ASD and TD, using homogeneous specific tasks designed to assess word reading strategies. (shrink)

ORCA.IT, a new online test of online research and comprehension was developed for the Italian population. A group of 183 students attending various types of upper secondary schools in Northern Italy were tested with the new tool and underwent further cognitive and neuropsychological assessment. The different school types involved in the study are representative of the school population in the Italian system, but can also be easily compared with the educational systems of other countries. The new test turned out to (...) have good psychometric properties after accurate item construction and final selection. In particular, Version 1 showed better characteristics than Version 2. Subsequently, comparison with one-way ANOVAs were performed to test whether differences exist between different school types, between groups with and without reading difficulties, and between males and females. Such differences are sometimes reported in the literature, but many remain controversial. Further, Pearson’s bivariate correlations were calculated to analyze associations between scores on the ORCA.IT and cognitive/neuropsychological variables. Finally, a stepwise regression analysis was performed on aggregated scores to identify the predictors of performance on each of the two versions, The test, especially in the most complete version (Version 1), appears to accurately and reliably capture students’ web searching abilities and online reading comprehension. The tool could highlight differences in online search and comprehension ability between students with and without reading difficulties, not penalizing overall performance but allowing very specific weaknesses to be pointed out. Further, it seems to be able to capture differences due to both educational pathways (different school types) and social attitudes (differences between males and females). Most interesting, it shows to be clearly resting on specific cognitive and neuropsychological abilities, including language, memory and attentional skills, which explain a large portion of the total variance. Offline text reading comprehension is a crucial predictor of online reading performance, while decoding ability is not. Prior knowledge also influences the results, as expected. The new tool turns out to be rather independent from previous internet experience and to measure more cognitively grounded processes related to information gathering, processing and communicating. (shrink)

This article argues for a redefinition of difficulty in relation to the inextricable violence of modernity and examines the consecutive challenge to notions of understanding and interpretation — of a text, of language or of the other — that this repositioning brings. To this end, the article offers a nuanced rereading of Steiner’s canonical fourfold categorization of difficulty, in dialogue with, first, Édouard Glissant’s opacity and, second, Jonathan Pugh and David Chandler’s theorizations of ‘abyssal thought’, an approach emerging from Caribbean (...) and critical Black studies, exploring the key challenge it poses to forging an unmasterful, after Julietta Singh, comparative literary practice. With an equal attention to the theoretical and pedagogical dimensions of reading difficulty, the article emphasizes the importance of the accretive and embodied nature of the reading process and offers a repositioning of textual difficulty, as a meeting site of opacities, and a reformulation of a difficult, unmasterful reading practice, after catastrophe and with others. (shrink)

This book provides a range of interdisciplinary and international perspectives on difficulties in literacy development. The high-profile team of contributors provide ethical and policy discussions, as well as contextualizing individual and collective strategies to addressing difficulties in literacy development. The chapters break new ground by encompassing a wide range of perspectives related to critical literacy, socio-cultural, cognitive, and psychological viewpoints, to help inform practice, policy and research into literacy difficulties. This book will be of interest to postgraduate (...) students, teachers, researchers, education professionals and policy makers who are keen to address difficulties in literacy development. (shrink)

The following lines are a famous crux: τ μν τι βασιλες σσ μεγαλν πολων ει συγγενς φθαλμς αδοιτατον γρας τε τοτο μειγνμενον φρεν. The reading is that of all MSS., save for the necessary correction αδοιτατον for αδοιςτατον, which will not scan. I have purposely left it without punctuation. The core of the difficulty of course is the word φθαλμς Farnell, it seems to me, has made it abundantly clear that this cannot be literal, for, apart from the oddity (...) of the epithet συγγενς in such a context, to take it as meaning the actual physical eye of Arkesilas involves giving ει the impossible meaning ‘sees’. But the metaphorical meaning is not much easier. A person or group of persons can be the ‘eye’, that is to say the most precious part, of something, as the Emmenidai were the ‘eye of Sicily’, Ol. ii, 10, Amphiaraos the ‘eye’ of Adrastos' army, Ol. vi, 16, the eldest or only son, or even the presence of the master, the ‘eye’ of the house , a child the ‘eye’—we should perhaps say ‘light’—of his mother's life, Eurip. Andr., 406, and perhaps, for the interpretation is not too certain, a chosen band of Athenians the ‘eye’ of Theseus' land, Aesch., Eumen., 1025. In these instances we may I think acquiesce in Groeneboom's remark on Pers., loc. cit., that ‘eye’ is used to signify the most precious or noble part of something, its glory. (shrink)

This innovative critical study reinterprets Ludwig Wittgenstein's philosophy for the study of modernist and contemporary literature and brings Wittgenstein into literary conversations around problems of difficulty, ethical instruction, and the yearning for transformation. Central to Karen Zumhagen-Yekple͹'s book are her critical readings of key modernist texts by Franz Kafka, Virginia Woolf, and James Joyce. Throughout, Zumhagen-Yekplé brings to bear an interpretive framework that she derives from Wittgenstein's gnomic "Tractatus Logico-Philosophicus" (first published in English in 1922, the "annus mirabilis" of modernism), (...) which she treats not as a theory of logic or metaphysics but as a complex mock-theoretical puzzle. The book's final chapter turns to recent fiction by J. M. Coetzee, a living author conscious of his debts both to Wittgenstein and his modernist literary precursors. This book will interest students of literary modernism, Wittgenstein, and the interconnections between fiction and ordinary language philosophy. (shrink)

In this volume--the first, focused study of Hume on time and identity--Baxter focuses on Hume’s treatment of the concept of numerical identity, which is central to Hume's famous discussions of the external world and personal identity. Hume raises a long unappreciated, and still unresolved, difficulty with the concept of identity: how to represent something as "a medium betwixt unity and number." Superficial resemblance to Frege’s famous puzzle has kept the difficulty in the shadows. Hume’s way of addressing it makes sense (...) only in the context of his unorthodox theory of time. Baxter shows the defensibility of that theory against past dismissive interpretations, especially of Hume’s stance on infinite divisibility. Later the author shows how the difficulty underlies Hume’s later worries about his theory of personal identity, in a new reading motivated by Hume’s important appeals to consciousness. Baxter casts Hume throughout as an acute metaphysician, and reconciles this side of Hume with his overarching Pyrrhonian skepticism. (shrink)

Consider the following two sentences: " I see a dark discoloration in the back of my hand. I feel a jabbing pain in the back of my hand. " They seem to have the same surface grammar, and thus prima facie invite the same kind of semantic treatment. Even though a reading of ‘see’ in where the verb is not treated as a success verb is not out of the question, it is not the ordinary and natural reading. (...) Note that if I am hallucinating a dark discoloration in the back of my hand, then is simply false. For to be true, therefore, I have to stand in the seeing relation to a dark discoloration in the back of my hand, i.e., to a certain surface region in the back of my hand marked by a darker shade of the usual color of my skin, a certain region that can be seen by others possibly in the same way in which I see it. Also note that although the truth of doesn’t require the possession of any concept by me expressed by the words making up the sentence, my uttering of to make a report typically does — if we take such utterances as expressions of one’s thoughts. So my seeing would typically induce me to identify something in the back of my hand as a dark discoloration. This is a typical case of categorization of something under a concept induced by perception. Of course, my uttering of does more than attributing a physical property to a bodily region, it also reports that I am seeing it. (shrink)