Psychedelics have been recognized as model interventions for studying altered states of consciousness. However, few empirical studies of the shamanic state of consciousness, which is anecdotally similar to the psychedelic state, exist. We investigated the neural correlates of shamanic trance using high-density electroencephalography (EEG) in 24 shamanic practitioners and 24 healthy controls during rest, shamanic drumming, and classical music listening, followed by an assessment of altered states of consciousness. EEG data were used to assess changes in absolute power, connectivity, signal (...) diversity, and criticality, which were correlated with assessment measures. We also compared assessment scores to those of individuals in a previous study under the influence of psychedelics. Shamanic practitioners were significantly different from controls in several domains of altered states of consciousness, with scores comparable to or exceeding that of healthy volunteers under the influence of psychedelics. Practitioners also displayed increased gamma power during drumming that positively correlated with elementary visual alterations. Furthermore, shamanic practitioners had decreased low alpha and increased low beta connectivity during drumming and classical music and decreased neural signal diversity in the gamma band during drumming that inversely correlated with insightfulness. Finally, criticality in practitioners was increased during drumming in the low and high beta and gamma bands, with increases in the low beta band correlating with complex imagery and elementary visual alterations. These findings suggest that psychedelic drug-induced and non-pharmacologic alterations in consciousness have overlapping phenomenal traits but are distinct states of consciousness, as reflected by the unique brain-related changes during shamanic trance compared to previous literature investigating the psychedelic state. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Meaning in Spinoza’s MethodAlan Nelson and Noa SheinAaron V. Garrett. Meaning in Spinoza’s Method. New York: Cambridge University Press, 2003. Pp. xii + 240. Cloth, $60.00.This is a book about some fundamental aspects of Spinoza's mature metaphysics. The principal focus is on Part I of the Ethics concerning infinite substance, and on Part V concerning the intuitive knowledge that is the goal of philosophy. Within this focus, (...) Garrett concentrates on Spinoza's method. Garrett explains how he has been influenced by interpretations that stress the structural parallel between the synthetic, geometrical presentation of the Ethics and the relations among the ideas of the well-ordered mind. The Ethics proceeds by deriving propositions concerning substance's modes from definitions of substance and related notions while the mind, insofar as it is free from emotions, intuitively knows things as following from God. Garrett's distinctive thesis, however, is that Spinozistic enlightenment depends on the process of emending the intellect as described in one of Spinoza's earliest works, the Treatise on the Emendation of the Intellect. While this work strongly foreshadows many of Spinoza's mature doctrines, its exposition much more closely resembles the analytic, non-geometric approach of Descartes's Meditations. Spinoza's therapy for the emendation of our "inadequate" ideas closely parallels Descartes's analytic therapy for making what he calls confused ideas "clear and distinct."Garrett is on firm ground in arguing that the process of enlightenment cannot be an unbroken chain of intuitive deductions. For one thing, the definitions and axioms printed in a copy of the Ethics are first sensed by the reader and are not likely to produce immediately the requisite adequate ideas (172). An example of one of Garrett's interesting conclusions is that the definition of God as consisting of an infinity of attributes, the sixth of Part I of the Ethics (1D6), is preliminary and replaced in the process of therapeutic emendation by a definition of God as self caused. It is only after our ideas have become adequate at the end of the process that we are able to fully appreciate 1D6 (171).One might think that Garrett does not go far enough here because his point can be naturally extended. Definitions might assist us in the process of bringing our adequate ideas to light, but our cognitive goal is making these ideas themselves adequate. What then are the ideas we can make most adequate and exactly what distinguishes them from highly refined ideas that are nevertheless more inadequate than these? On one interpretation it is divine essence, that is, the attributes of thought and extension that are individually most adequately conceived after successful therapy. It is tempting to suppose that a single idea of God as both thinking and extended would be more adequate still, but Spinoza holds that our conceptions of these attributes are "really distinct" in a sense analogous to Descartes's(1P10). Spinoza's 1D6 definition of God as a substance consisting of both these attributes (and perhaps other inconceivable ones) thus seems to indicate a subsumption of the attributes we can conceive under the image of some printed or spoken words. Such an idea would be more inadequate than our adequate conceptions of the individual attributes. One is here strongly reminded of Descartes's characterization in Article 63 of the first Part of his Principles of Philosophy, "... we more readily understand extended substance or thinking substance than substance alone."In his seventh and concluding chapter, Garrett tackles the grand problems of intuitive knowledge or knowledge of "the third kind" and the sense in which Spinoza thought a part of the human mind is eternal. The discussion is necessarily complex, but one great advantage of Garrett's treatment is that he realizes intuitive knowledge cannot consist in the explicit deduction of particular things from God. The detailed determination of particular "everyday objects" requires sensory knowledge which is, of course, never perfectly determinate and therefore inherently inadequate. But we can acquire the "second kind" of adequate knowledge by understanding what our minds have in common with other determinate, finite things. This finally enables us to ascend to an appreciation of these... (shrink)

As one of the preeminent philosophers of the twentieth century, W. V. Quine made groundbreaking contributions to the philosophy of science, mathematical logic, and the philosophy of language. This collection of essays examines Quine's views, particularly his holism and naturalism, for their value to feminist theorizing today. Some contributors to this volume see Quine as severely challenging basic tenets of the logico-empiricist tradition in the philosophy of science—the analytic/synthetic distinction, verificationism, foundationalism—and accept various of his positions as potential resources for (...) feminist critique. Other contributors regard Quine as an unrepentant empiricist and, unlike feminists who seek to use or extend his arguments, they interpret his positions as far less radical and more problematic. In particular, critics and advocates of Quine's arguments that the philosophy of science should be "naturalized"—understood and pursued as an enterprise continuous with the sciences proper—disagree deeply about whether such a naturalized philosophy is "philosophy enough." Central issues at stake in these disagreements reflect current questions of special interest to feminists and also bridge the analytic and postmodern traditions. They include questions about whether and how the philosophy of science, as a form of practice, is or can be normative as well as questions concerning the implications of Quine's philosophy of language for the transparency and stability of meaning. In representing feminist philosophy centrally engaged with the analytic tradition, this volume is important not only for what it contributes to the understanding of Quine and naturalized epistemology but also for what it accomplishes in working against restrictive conceptions of the place of feminism within the discipline. Aside from the editors, the contributors are Kathryn Pyne Addelson, Louise M. Antony, Richmond Campbell, Lorraine Code, Jane Duran, Maureen Linker, Phyllis Rooney, and Paul A. Roth. (shrink)

We prove that in IST, Nelson's internal set theory, the Uniqueness and Collection principles, hold for all (including external) formulas. A corollary of the Collection theorem shows that in IST there are no definable mappings of a set X onto a set Y of greater (not equal) cardinality unless both sets are finite and #(Y) ≤ n #(X) for some standard n. Proofs are based on a rather general technique which may be applied to other nonstandard structures. In particular (...) we prove that in a nonstandard model of PA, Peano arithmetic, every hyperinteger uniquely definable by a formula of the PA language extended by the predicate of standardness, can be defined also by a pure PA formula. (shrink)

Bertrand Russell famously disparaged Thomas Aquinas as having ‘little of the true philosophic spirit’, because ‘he does not, like the Platonic Socrates, set out to follow wherever the argument may lead.’ Like many of Russell's pronouncements, this is breathtakingly supercilious and unfair. Still, even an enthusiastic admirer of Aquinas may worry that there is something in it, that there is something wrong with religious ‘commitments’ in philosophy. I examine Russell's objection by comparing standards of permissibility in epistemology with standards of (...) permissibility in ethics, where these issues are better understood. I conclude that the epistemic standard behind Russell's criticism is no less contentious in epistemology than, say, direct utilitarianism is in ethics. (shrink)

The basis of the Periodic Table is discussed. Electronic configuration recurs in only 21 out of the 32 groups. A better basis is derived by considering the highest classical valency (v) exhibited by an element and a new measure, the highest valency in carbonyl compounds (v*). This leads to a table based on the number of outer electrons possessed by an atom (N) and the number of electrons required for it to achieve an inert (noble) gas configuration (N*). Periodicity of (...) these is nearly complete. The new basis helps to settle the question of the best form of table and related issues. (shrink)

Ewald considered tense operators G, H, F and P on intuitionistic propositional calculus and constructed an intuitionistic tense logic system called IKt. In 2014, Figallo and Pelaitay introduced the variety IKt of IKt-algebras and proved that the IKt system has IKt-algebras as algebraic counterpart. In this paper, we introduce and study the variety of tense Nelson algebras. First, we give some examples and we prove some properties. Next, we associate an IKt-algebra to each tense Nelson algebras. This result (...) allowed us to determine the congruence of the tense Nelson algebras and also to characterize the subdirectly irreducible tense Nelson algebras and particularly the simple tense Nelson algebras. Finally, we prove that there exists an equivalence between the category of IKt-algebras and the category of tense centered Nelson algebras. (shrink)

This chapter contains sections titled: I II III IV V.

In this paper we present a category equivalent to that of tense Nelson algebras. The objects in this new category are pairs consisting of an IKt-algebra and a Boolean IKt-congruence and the morphisms are a special kind of IKt-homomorphisms. This categorical equivalence permits understanding tense Nelson algebras in terms of the better–known IKt-algebras.

Appeals to some thesis of underdetermination, to the idea that scientific theories and hypotheses are not entailed by the evidence that supports them, are common in feminist philosophy of science. These appeals seek to understand and explain how androcentrism and other problematic approaches to gender have found their way into good science, as well as the reverse – how feminist approaches to gender and science that are also value-laden, can contribute to good science. Focusing on W.V. Quine’s positions on holism (...) and underdetermination, I argue that although Quine’s general thesis of holism does not entail his thesis of global underdetermination, his account of and arguments for moderate holism entail a localized and generalizable underdetermination, which I call moderate underdetermination. This moderate underdetermination is not transient or true of only some theories and hypotheses. Rather, it is a permanent state of affairs that characterizes all reasonably inclusive theories and hypotheses, however much evidence for them accumulates. I contend that Quine’s moderate holism entails the most robust and defensible argument for localized underdetermination, and that feminists would do well to appeal to it in arguing that values inform good science. (shrink)

In this paper, we continue with the study of tense operators on Nelson algebras (Figallo et al. in Studia Logica 109(2):285–312, 2021, Studia Logica 110(1):241–263, 2022). We define the variety of algebras, which we call tense Nelson D-algebras, as a natural extension of tense De Morgan algebras (Figallo and Pelaitay in Logic J IGPL 22(2):255–267, 2014). In particular, we give a discrete duality for these algebras. To do this, we will extend the representation theorems for Nelson algebras (...) given in Sendlewski (Studia Logica 43(3):257–280, 1984) to the tense case. (shrink)

Pre-analytically at least some of our inductions seem to be possessed of rational justification. This comment would apply, for instance, to my present induction, ‘If that climber high on the Flatirons falls he will be killed,’ not to mention such more momentous inductions as, ‘If a full-scale nuclear war breaks out there will be greater destruction than in World War II.’ Notoriously, however, a few Humean reflections seem to strip even the most plausible of our inductions of all possible rational (...) justification, leaving them mere bare psychological faits accomplis: in effect, section V of the Enquiry's ‘Sceptical Solution of these Doubts.’. (shrink)

I consider the issues that recent feminist critiques of science raise for contemporary empiricist philosophy of science. Three particular focuses of feminist criticism are addressed: the social arrangements within and outside science communities that divide cognitive labor and authority, the apparent androcentrism in several of the social and biological sciences, and the use of models that reflect Western political experience in the biological sciences. ;I urge that a consideration of these issues indicate that science communities interact with our larger society (...) with consequences for the directions of scientific research, and with consequences for our common sense understandings of human and nonhuman nature. In the light of feminist criticisms, I re-examine the philosophy of science of a major American philosopher, W. V. O. Quine. The interplay between Quine's work and feminist scholarship provides support for two thesis. ;First, I urge that contemporary philosophy of science has too narrowly construed the factors relevant to the epistemology of science. Among the factors that feminists have shown to have an impact on research programs and theoretical frameworks are Western gender arrangements and Western political experience generally. Much contemporary philosophy of science lacks the categories that would enable these factors to be incorporated in the epistemology of science. I argue that frameworks need to be developed that can both accommodate these factors and account for the success of our theorizing. ;Secondly, I urge that the thesis of "epistemological individualism" be abandoned by empiricists. I argue that the feminist criticisms considered and aspects of Quine's philosophy of science indicate that the thesis is empirically unsound. I argue that the acquirers of knowledge are communities, and not individuals, and I use aspects of Quine's philosophy of science and the current presence of androcentric and feminist perspectives in the sciences to support this view. (shrink)

Phylogenetic systematics is one of the most important analytical frameworks of modern Biology. It seems to be common knowledge that within phylogenetics, ‘groups’ must be defined based solely on the synapomorphies or on the “derived” characters that unite two or more taxa in a clade or monophyletic group. Thus, the idea of synapomorphy seems to be of fundamental influence and importance. Here I will show that the most common and straightforward understanding of synapomorphy as a shared derived character is not (...) sufficient and eventually must be rejected in favor of Nelson’s relational interpretation of such term. Arguing for this point and using three examples from previously published Apes’ genomic matrices, I explicitly demonstrate that the relationship )) with Hylobatidae as a sister taxon, may be successfully recovered by three-taxon statement analysis and three-taxon statement average consensus analysis even if all of the evident standard shared derived molecular characters of the relationship )) with Hylobatidae as a sister taxon, have been excluded from the molecular alignments. Neither conventional Maximum Parsimony nor Maximum Likelihood or Bayesian Inference can do this in such situation. Thus, our results show that the relationship )) with Hylobatidae as a sister taxon has appeared, in some way, behind standard shared derived characters: the last ones could be excluded, but the relationship remains the same. (shrink)

In this, his first book, originally published in 1926, Henry Nelson Wieman sets forth a view on the relationship of religious experience and scientific method which in substance he has maintained ever since. According to Wieman, our knowledge of the concrete world consists of immediate sensuous experience as interpreted through some set of concepts. Religious experience is the richest form of immediate sensuous experience. It is our awareness of God, who is as much an object of experience as are (...) tree and hill and stone. And scientific method is the systematic procedure by which the conceptual network for interpreting immediate sensuous experience is clarified and corrected, with the experience-concept compound thus becoming "science." Religious experience, therefore, receives its most adequate interpretation in science; while science, in turn, receives its most stimulating input from religious experience. In principle, the highest of the individual sciences is theology; in fact, however, the very complexity of religious experience and the difficulty of distinguishing it clearly from other types of immediate sensuous experience have prevented more than merely minimal progress in achieving a truly scientific theology. On the whole our ideas about God are marked by confusion and controversy, therefore, despite the fact that some of these notions probably are true. Wieman’s book serves as an excellent example of the liberal thought which dominated much of theology and philosophy-of-religion during the last part of the nineteenth century and the first part of the twentieth. The religious thinker with a liberal perspective conceives his primary challenge as developing a scientifically acceptable interpretation of religious experience, taking that experience itself as being obvious and almost universally recognized. One need not be particularly well read to know that current judgments regarding the obviousness of religious experience are hardly so sanguine, however, and that the religious thinker typical of our own age therefore conceives his primary challenge quite differently.—J. M. V. (shrink)

v. 1. Nominalism, constructivism, and relativism in the work of Nelson Goodman -- v. 2. Nelson Goodman's new riddle of induction -- v. 3. Nelson Goodman's philosophy of art -- v. 4. Nelson Goodman's theory of symbols and its applications.