Leave No Trace (LNT) has become the official education and outreach policy for managing recreational use in parks and wilderness areas throughout the United States. It is based on seven core principles that seek to minimize impacts from backcountry recreational activities such as hiking, climbing, and camping. In this paper, we review the history and current practice of Leave No Trace in the United States, including its complex role in the global political economy of outdoor recreation. We conclude by suggesting (...) a new framework for building on the successes of Leave No Trace, while moving beyond its self-imposed limitations, and recapturing wilderness recreation as a more collaborative, participatory, productive, democratic, and radical form of political action. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:THE DISTINCTION BETWEEN RES SIGNIFICATA AND MODUS SIGNIFICANDI IN AQIDNAS'S THEOLOGICAL EPISTEMOLOGY GREGORY RoccA, O.P. Dominican School of Philosophy and Theology Berkeley, California ST. THOMAS AQUINAS often refers to the distinction between res significata and modus significandi. He asserls that, whie the :absolute and analogical predicates of positive theology may be pveditcated of God with regard to their RS,1 they mrust,be denied of God with regard to their (...) MS.2 The distinotion, then, is an imporlant element in his 1 For brevity's sake I will refer to res significata, by RS and to modus significand.i by MS; I will also speak of the res/modus distinction. The following abbreviations for Aquinas's works will be used: BDH=Flropositio in librum Boethii De hebdomadibus (Marietti ed., 1954); DA=the disputed question De anima (ed. J. H. Robb [Toronto: PIMS, 1968]) ; DDN=Flropositi super librum Dionysii De divinis nominibus (Marietti ed., 1950); DP=De potentia (Marietti ed., 1949); DSS=De substantiis separatis (Leonine Commission, vol. 40, 1969); DV=De veritate (Leonine Co=ission, vol. 22, 197276 ); Herm.=Sententia libri Peri hermeneias (Marietti ed., 1955); John= Leotura super Johannem (Marietti ed., 1952); Meta.=Sententia libri Metaphysioorum (Marietti ed., 1950); Phys.=Sententia libri Physioorum (Marietti ed., 1965) ; Quod. = Quaestiones quodlibetales (Marietti ed., 1956) ; BOG= Summa contra gentiles (Marietti ed., vols. 2-3, 1961) ; SDO=Eropositio super librum De causis (Marietti ed., 1955) ; SS=Scriptum super libros Sententiarum (Paris: Lethielleuro, 1929, 1933, 1947); ST=Summa theologiae (Alba/ Rome: Editiones Paulinae, 1962). The English translations are my own. For Thomas's positive theology of the divine names, see Gregory Rocca, "Analogy as Judgment and Faith in God's Incomprehensibility: A Study in the Theological Epistemology of Thomas Aquinas" (Ann Arbor: University Microfilms International, 1989) 540-615. 2 A characteristic text: "In every name predicated by us [of God], imperfection is found with respect to the name's mode of signifying [MS], 173 174 GREGORY ROCCA, O.P. theological epistemology and onomatofogy.3 For some, however, the distinction wou1d ultimately lead us back to the univocist camp of Duns Scotus,4 for they see it as hiding within itself 1 a latent core of univocity. One writes that the predication involved in 1anafogy of attribution is both univocal and equivocail: " It is univocal, insofar as it ai1ways denotes the siame proprietas rei; it is equivoca,J since, through a differrent modus significandi, it •connotes ' a different existentiail mode of the denoted proprieta.'J." 5 Another writes, in simil.ar fashion, that "the :same property is signifi·ed, hut the way in which the property inheres in the subject is different." a Another contends tha;t the idis:tinJCtion between RS and MS is a" bogus distinction between what words realily mean and what they mean to us." 7 If the res/niodus distinction is an imwhich does not belong to God, though the thing signified [RS'] is suitable to God in some eminent manner " (SOG l.30.277) ; the same sentiment is found in many other texts such as SS L35.LL ad2 and ST l.13.3. Thomas often explains the saying of Pseudo-Dionysius, that negations about God are true while affirmations are vague, by claiming that affirmations are true as regards their RS but not as regards their MS (SS l.22.l.2. adl; l.4.2.l. ad2; SOG l.30.277; DP 7.5 ad2; ST l.13.12. adl; SDO 6.161). a Hampus Lyttkens, however, thinks the distinction plays no essential role in Thomas's theory of the divine names (" Die Bedeutung der Gottesprltdikate bei Thomas von Aquin," N eue Zeitschrift fur systematisahe Theologie und Religionsphilosophie 6 [1964] 277-80). Klaus Muller claims the application of the res/modus distinction to the divine names " says really nothing at all" (Thomas van Aquins Theorie und Praxis der Analogie. Der Streit um das rechte Vorurteil und die Ana,lyse einer aufsohlussreichen Diskrepanz in der "Summa theologiae ", Regensburger Studien zur Theologie 29 [Frankfurt am Main/Bern/NY: Peter Lang, 1983] 100). 4 See Richard Swinburne, The Coherence of Theism (Oxford: Clarendon, HJ77) 78-80. s Jan Pinborg, Logik und Semantik im Mittelalter: liJin uberblick, Afterword by... (shrink)

Intercellular signaling by growth factors, hormones and neurotransmitters produces second messenger molecules such as cyclic adenosine monophosphate (cAMP) and diacylglycerol (DAG). Protein Kinase A and Protein Kinase C are the principal effector proteins of these prototypical second messengers in certain cell types. Recently, novel receptors for cAMP and DAG have been identified. These proteins, designated EPAC (Exchange Protein directly Activated by cAMP) or cAMP‐GEF (cAMP regulated Guanine nucleotide Exchange Factor) and CalDAG‐GEF (Calcium and Diacylglycerol regulated (...) Guanine nucleotide Exchange Factor) or RasGRP (Ras Guanine nucleotide Releasing Protein) are able to mediate some of the physiologic effects of the second messengers in a protein‐kinase‐independent fashion. These proteins are exchange factors for Ras family GTPases that operate in pathways that run parallel to the classic kinase‐dependent pathways. The rapidly emerging recognition of the functions of these “non‐kinase” effectors in diverse processes such as insulin secretion, thymocyte development, asthma and malignant transformation creates new opportunities for discovery and identifies potential new therapeutic targets. BioEssays 26:730–738, 2004. © 2004 Wiley Periodicals, Inc. (shrink)

What happens when a worldly Israeli cognitive psychologist goes to the Amazon Basin where he ingests the famed psychotropic concoction Ayahuasca (the ‘vine of the dead’) again and again and again? Our intrepid philosophical psychologist is no longer a sprightly youth, maddened for adventure. He is instead an accomplished theoretician with widely published articles (several in this journal) and a noted book (Shanon, 1993) that speak the from the perspective of cognitive (or phenomenological, for Shanon) psychology against the reductive tendency (...) to view the mind’s activities as created by the the brain’s activities. Even before his Amazonian quest, he placed himself in the Gibsonian camp seeing the mind as dynamic intermediary between organism and environment and active participant in both. What did happen is this extraordinary book, a scientific analysis of his own visions and the education of both Shanon’s views and, perhaps, his soul. (shrink)

Politics, Philosophy & Economics, Volume 21, Issue 4, Page 415-436, November 2022. Recent debates over ideal theory have reinvigorated interest in the question of anarchy. Would a perfectly just society need—or even permit—a state? Ideal anarchists such as Jason Brennan, G.A. Cohen, Christopher Freiman, and Jacob Levy argue that strict compliance with justice obviates the need for a state. Ideal statists such as David Estlund, Gregory Kavka, and John Rawls think that coercive political institutions serve indispensable functions even in (...) ideal conditions. This paper defends ideal anarchism. Our argument begins by describing a camping trip inspired by Cohen that illustrates why an anarchist form of cooperation is more intrinsically desirable than the statist alternative. After detailing Rawls's ideal theory and Estlund's “nonconcessive” moral theory, we argue—contrary to Rawls, Estlund, and Kavka—that large-scale societies without moral imperfection do not need a state. (shrink)

A number of philosophers and logicians have argued for the conclusion that maps are logically tractable modes of representation by analyzing them in propositional terms. But in doing so, they have often left what they mean by "propositional" undefined or unjustified. I argue that propositions are characterized by a structure that is digital, universal, asymmetrical, and recursive. There is little positive evidence that maps exhibit these features. Instead, we can better explain their functional structure by taking seriously the observation that (...) maps arrange their constituent elements in a non-hierarchical, holistic structure. This is compatible with the more basic claim advanced by defenders of a propositional analysis: that (many) maps do have formal semantics and logic. (shrink)

Most of us create and use a panoply of non-sentential representations throughout our ordinary lives: we regularly use maps to navigate, charts to keep track of complex patterns of data, and diagrams to visualize logical and causal relations among states of affairs. But philosophers typically pay little attention to such representations, focusing almost exclusively on language instead. In particular, when theorizing about the mind, many philosophers assume that there is a very tight mapping between language and thought. Some analyze utterances (...) as the outer vocalizations of inner thoughts (e.g. Grice 1957, Devitt 2005), while others treat thought as a form of inner speech (e.g. Sellars 1956/1997, Carruthers 2002). But even philosophers who take no stand on the relative priority of language and thought still tend to individuate mental states in terms of the sentences we use to ascribe them. Indeed, Dummett (1993) claims that it is constitutive of analytic philosophy that it approaches the mind by way of language. In many ways, this linguistic model is salutary. Our thoughts are often intimately intertwined with their linguistic expression, and public language does provide a comparatively tractable proxy for, and a window into, the messier realm of thought. However, an exclusive focus on thought as it is expressed in language threatens to leave other sorts of thought unexplained, or even to blind us to their possibility. In particular, many cognitive ethologists and psychologists find it useful to talk about humans, chimpanzees, birds, rats, and even bees as employing cognitive maps. We need to make sense of this way of talking about minds as well as more familiar sentential descriptions. In what follows, I investigate the theoretical and practical possibility of non-sentential thought. Ultimately, I am most interested in the contours of distinctively human thought: what forms does human thought take, and how do those different forms interact? How does human thought compare with that of other animals? In this essay, however, I focus on a narrower and more basic theoretical question: could thought occur in maps? Many philosophers are convinced that in some important sense, thought per se must be language-like.. (shrink)

I take up three puzzles about our emotional and evaluative responses to fiction. First, how can we even have emotional responses to characters and events that we know not to exist, if emotions are as intimately connected to belief and action as they seem to be? One solution to this puzzle claims that we merely imagine having such emotional responses. But this raises the puzzle of why we would ever refuse to follow an author’s instructions to imagine such responses, since (...) we happily imagine many other implausible things. A natural response to this second puzzle is that our responses to fiction are real, and so can’t just be conjured up in response to an author’s demands. However, this simple response is inadequate, because we often respond differently to people and events in fiction than we would if we encountered them in real life. Solving these three puzzles in a consistent way requires the notion of a “perspective” on a fictional world. I sketch an account of this intuitive but frustratingly amorphous notion: perspectives are tools for organizing our thinking, which can in turn alter our emotional and evaluative responses. Cultivating a perspective can be illuminating, entertaining, or corrupting — or all three at once. (shrink)

Slurs are incendiary terms so much that many ordinary speakers and theorists deny that sentences containing them can ever be true, and utterances where they occur embedded within normally "quarantining" contexts, like conditionals and indirect reports, are still typically offensive. At the same time, however, many speakers and theorists also find it obvious that sentences containing slurs can be true; and there are clear cases where embedding does inoculate a speaker from the slur's offensiveness. I argue that four standard accounts (...) of the "other" element that differentiates slurs from their more neutral counterparts semantic content, perlocutionary effect, presupposition, and conventional implicature all fail to account for this puzzling mixture of intuitions about truth, and for this mixture of projection and quarantining. Instead, I propose that slurs make two distinct, coordinated contributions to a sentence's conventional communicative role: predication of group membership and endorsement of a derogating perspective on the group. Predication of group membership is "at issue" by default, but different semantic and conversational contexts can alter the relative prominence and scope of the two contributions. (shrink)

Philosophers have often adopted a dismissive attitude toward metaphor. Hobbes (1651, ch. 8) advocated excluding metaphors from rational discourse because they “openly profess deceit,” while Locke (1690, Bk. 3, ch. 10) claimed that figurative uses of language serve only “to insinuate wrong ideas, move the passions, and thereby mislead the judgment; and so indeed are perfect cheats.” Later, logical positivists like Ayer and Carnap assumed that because metaphors like..

Everyone has mistaken one thing for another, such as a stranger for an acquaintance. A person who has mistaken two things, Joseph Camp argues, even on a massive scale, is still capable of logical thought. In order to make that idea precise, one needs a logic of confused thought that is blind to the distinction between the objects that have been confused. Confused thought and language cannot be characterized as true or false even though reasoning conducted in such language (...) can be classified as valid or invalid. To the extent that philosophers have addressed this issue at all, they take it for granted that confusion is a kind of ambiguity. Camp rejects this notion; his fundamental claim is that confusion is not a mental state. To attribute confusion to someone is to take up a paternalistic stance in evaluating his reasoning. Camp proposes a novel characterization of confusion, and then demonstrates its fruitfulness with several applications in the history of philosophy and the history of science. (shrink)

I distinguish among a range of distinct representational devices, which I call "frames", all of which have the function of providing a perspective on a subject: an overarching intuitive principle or for noticing, explaining, and responding to it. Starting with Max Black's metaphor of metaphor as etched lines on smoked glass, I explain what makes frames in general powerful cognitive tools. I distinguish metaphor from some of its close cousins, especially telling details, just-so stories, and analogies, in ordinary cognition and (...) communication. And I use these distinctions to illustrate different sorts of gaps that frames or models can open up between representation and reality. (shrink)

Mobsters and others engaged in risky forms of social coordination and coercion often communicate by saying something that is overtly innocuous but transmits another message ‘off record’. In both ordinary conversation and political discourse, insinuation and other forms of indirection, like joking, offer significant protection from liability. However, they do not confer blanket immunity: speakers can be held to account for an ‘off record’ message, if the only reasonable interpreta- tions of their utterance involve a commitment to it. Legal liability (...) for speech in the service of criminal behavior displays a similar profile of significant protection from indirection along with potential liability for reasonable interpretations. Specifically, in both ordinary and legal contexts, liability depends on how a reasonable speaker would expect a reasonable hearer to interpret their utterance in the context of utter- ance, rather than on the actual speaker’s claimed communicative intentions. (shrink)

Our ordinary and theoretical talk are rife with “framing devices”: expressions that function, not just to communicate factual information, but to suggest an intuitive way of thinking about their subjects. Framing devices can also play an important role in individual cognition, as slogans, precepts, and models that guide inquiry, explanation, and memory. At the same time, however, framing devices are double-edged swords. Communicatively, they can mold our minds into a shared pattern, even when we would rather resist. Cognitively, the intuitive (...) power of a frame can blind us both to known features that don’t fit easily within the frame, and also to “unknown unknowns” we have not yet encountered. Thus, perhaps Locke is right to disavow such “eloquent inventions” as “perfect cheats” that “insinuate wrong ideas, move the passions, and thereby mislead the judgment.” Against this, I argue that while the metaphor of double-edged swords is indeed apt, this is because frames are tools for thought. Like any tool, they can be used well or badly; but they do not fall outside the realm of rationality altogether. I describe how framing devices express open-ended perspectives, which produce structured intuitive characterizations of particular subjects. I argue that frames can make effective, distinctive epistemic contributions in the course of inquiry, and that the cognitive structures that frames produce can contribute to, and constitute, epistemic achievements in their own right, even in highly idealized circumstances at the nominal end of inquiry. Throughout, I focus especially on scientific understanding, because it serves as a paradigm case of rational inquiry, from which frames and perspectives are most likely to be excluded. (shrink)

Much liberal-democratic thought has concerned itself primarily – even exclusively – with coercive interference in citizens’ lives. But political actors do things – they engage in influential speech, they offer incentives, they mislead other actors, they disrupt the expected functioning of decision-making mechanisms etc. – that fall short of coercion, yet may nonetheless call for normative evaluation and public justification, precisely because they serve to purposively alter citizens’ beliefs, intentions and behaviour. With this article, I explicate a conception of political (...) manipulation to capture this sort of interference, and to distinguish individual manipulation from the manipulation of nonindividual agents like committees, institutions and states. The account, beyond being necessary for further work on the ethics of political manipulation, should prove useful to both normative thinkers interested in power, justice and the ethics of democratic decision-making, and empirical scholars in search of a conceptual apparatus to sharpen their investigations into the exercise of subtle forms of political power. (shrink)

If you were to take a time machine and travel back to the 1980s, Catholic epistemology would look drastically different than it does today, at least in analytic circles. One of those drastic changes relates to whether Catholic epistemology is consistent with Reformed epistemology. Another issue relates to whether St. Thomas Aquinas was a classical evidentialist. In this paper, I survey recent developments in Catholic epistemology. I do this by first looking at Gregory Stacey's recent work arguing the Catholic (...) Church's teaching on faith is best situated in a Reformed epistemological framework. I then engage decades old objections to Reformed epistemology from a Catholic perspective. I respond to these objections partly by surveying recent work by Catholic epistemologists. The paper then takes a turn to look at the recent scholarship on Aquinas' epistemology. I show that there is now an emerging consensus that Aquinas belongs not to a hard evidentialist camp as it was previously thought, but rather an externalist friendly tradition. (shrink)

The chapter focusses on the Scottish natural philosophy of the late eighteenth century represented by John Anderson (1726–1796) and John Robison (1739–1805), which is considered a link between Newton’s natural philosophy and nineteenth-century physics in Britain (Kelvin and Maxwell). Anderson and Robison have to be seen in a tradition of Scottish Newtonians established in the seventeenth century by David Gregory and John Keill and specifically shaped in the Mid-eighteenth century through the chemical-physical work of Joseph Black and the common-sense (...) philosophy of Thomas Reid. These latter Newtonians built on Newton’s theory of matter and short-range forces as indicated in Query 31 of his Opticks (Black) but also on his Rules of Reasoning of the second edition of his Principia (Black and Reid) and in this way created the theoretical framework in which Anderson and Robison developed their natural philosophy. In the center of their natural philosophy, which was oriented on experimental investigations, were the manifold open questions of the Baconian sciences of that time - theories of heat, light, electricity, magnetism as well as the understanding of the phlogiston. The chapter thus provides insight into the specific way in which the Newtonian camp participated in early modern natural philosophical speculations about minute particles of matter, fluids, or the propagation of light and heat. (shrink)

One goal of normative multi-agent system theory is to formulate principles for normative system change that maintain the rule-like structure of norms and preserve links between norms and individual agent obligations. A central question raised by this problem is whether there is a framework for norm change that is at once specific enough to capture this rule-like behavior of norms, yet general enough to support a full battery of norm and obligation change operators. In this paper we propose an answer (...) to this question by developing a bimodal logic for norms and obligations called NO. A key to our approach is that norms are treated as propositional formulas, and we provide some independent reasons for adopting this stance. Then we define norm change operations for a wide class of modal systems, including the class of NO systems, by constructing a class of modal revision operators that satisfy all the AGM postulates for revision, and constructing a class of modal contraction operators that satisfy all the AGM postulates for contraction. More generally, our approach yields an easily extendable framework within which to work out principles for a theory of normative system change. (shrink)

Ernie Lepore and Herman Cappelen (2005) argue that contextual influences on semantic content are much more restricted than most theorists assume, by presenting three tests for semantic context-sensitivity and concluding that only a very restricted class of expressions pass them. They combine this extreme semantic minimalism with an even more extreme speech-act pluralism, according to which a speaker has said anything that she can be reported as having said. I argue that because Lepore and Cappelen refuse to distinguish what is (...) said from what is claimed, their tests wrongly classify metaphor as semantically context-sensitive. I then argue that our ordinary linguistic practices support a distinction between what is said and what is claimed, and that underwrites a much more moderate form of speech act pluralism. (shrink)

Ecologists typically invoke "law-like" generalizations, ranging over "structural" and/or "functional" kinds, in order to explain generalizations about "historical" kinds (such as biological taxa)rather than vice versa. This practice is justified, since structural and functional kinds tend to correlate better with important ecological phenomena than do historical kinds. I support these contentions with three recent case studies. In one sense, therefore, ecology is, and should be, more nomothetic, or law-oriented, than idiographic, or historically oriented. This conclusion challenges several recent philosophical claims (...) about the nature of ecological science. (shrink)

A bounded formula is a pair consisting of a propositional formula φ in the first coordinate and a real number within the unit interval in the second coordinate, interpreted to express the lower-bound probability of φ. Converting conjunctive/disjunctive combinations of bounded formulas to a single bounded formula consisting of the conjunction/disjunction of the propositions occurring in the collection along with a newly calculated lower probability is called absorption. This paper introduces two inference rules for effecting conjunctive and disjunctive absorption and (...) compares the resulting logical system, called System Y, to axiom System P. Finally, we demonstrate how absorption resolves the lottery paradox and the paradox of the preference. (shrink)

Looks at Plato's theory of the cosmos, as well as what earlier Greeks thought of the makeup of the universe. Original.

During the postwar period, the concept of instinct came to encapsulate the debate around the importance of nature versus nurture. The fact that animals show highly organized behavior early in development suggested the presence of an underlying fixity where behavior was “inbuilt” into an animal’s biology despite an individual’s experiences. This placed a discrete and exhaustive line between the innate and acquired that became a foundation for the European-dominated field of ethology. Across the Atlantic, a group of comparative psychologists led (...) by the American Museum of Natural History’s T. C. Schneirla contested this approach, proposing that the study of animal behavior should avoid abstract dichotomies with a renewed focus on developmental processes. While Schneirla’s theoretical and empirical work shaped the modern study of animal behavior, his legacy requires revisiting in an era where the nature versus nurture debate is regaining prominence. In this article, I revisit Schneirla’s approach to behavior with a focus on his paper “Interrelationships of the ‘Innate’ and the ‘Acquired’ in Instinctive Behavior” (published in M. Autuori et al. (1956) _L’instinct dans le comportement des animaux et de l’homme_; Masson, Paris, pp. 387–452) for the journal’s “Classics in Biological Theory” collection; the paper is available as supplementary material in the online version of this article. A companion article (this issue; G. M. Kohn (2024) “A Discussion on Instinct, Paris, 1954”) presents the commentary that was published with it. (shrink)

Logic is a celebrated representation language because of its formal generality. But there are two senses in which a logic may be considered general, one that concerns a technical ability to discriminate between different types of individuals, and another that concerns constitutive norms for reasoning as such. This essay embraces the former, permutation-invariance conception of logic and rejects the latter, Fregean conception of logic. The question of how to apply logic under this pure invariantist view is addressed, and a methodology (...) is given. The pure invariantist view is contrasted with logical pluralism, and a methodology for applied logic is demonstrated in remarks on a variety of issues concerning non-monotonic logic and non-monotonic inference, including Charles Morgan’s impossibility results for non-monotonic logic, David Makinson’s normative constraints for non-monotonic inference, and Igor Douven and Timothy Williamson’s proposed formal constraints on rational acceptance. (shrink)

Ernie Lepore and Herman Cappelen (2005) argue that contextual influences on semantic content are much more restricted than most theorists assume, by presenting three tests for semantic context-sensitivity and concluding that only a very restricted class of expressions pass them. They combine this extreme semantic minimalism with an even more extreme speech-act pluralism, according to which a speaker has said anything that she can be reported as having said. I argue that because Lepore and Cappelen refuse to distinguish what is (...) said from what is claimed, their tests wrongly classify metaphor as semantically context-sensitive. I then argue that our ordinary linguistic practices support a distinction between what is said and what is claimed, and that underwrites a much more moderate form of speech act pluralism. (shrink)

* This update features fifty fast and impressive digital photo techniques-eighty percent of which are new since the previous edition * The CD-ROM includes a bonus e-book of the entire first edition-giving readers two books for the price of one * Developed by professional photographer and eDigital Photo contributing writer Gregory Georges, the techniques are valuable to both pros and hobbyists alike * Uses the latest version of Adobe Photoshop Elements in the examples, but the techniques are readily adaptable (...) to most image-editing programs * Includes techniques for traditional photo effects, combining photos, artistic effects, animations, digital photo blends, and much more * Step-by-step details, in-depth instructions, and plenty of illustrations-including a full color insert-make it easy for people to apply the techniques to their own photos. (shrink)

There are situations in human life where the failure to perform a certain act can be morally blameworthy and at the same time not constitute the failure of moral duty or obligation. While traditional approaches to ethics have not acknowledged the possibility of these acts, recent contributions to the literature have made a strong and convincing case for their existence. Here I explain the nature of these acts, present some examples of these acts as they might arise in one''s business (...) or professional life, and point out the importance of recognizing and performing these acts for those who wish to practice good ethics in their business or professional lives. (shrink)