Meiotic recombination is one of the main sources of genetic variation, a fundamental factor in the evolutionary adaptation of sexual eukaryotes. Yet, the role of variation in recombination rate and other recombination features remains underexplored. In this review, we focus on the sensitivity of recombination rates to different extrinsic and intrinsic factors. We briefly present the empirical evidence for recombination plasticity in response to environmental perturbations and/or poor genetic background and discuss theoretical models developed to explain how such plasticity could (...) have evolved and how it can affect important population characteristics. We highlight a gap between the evidence, which comes mostly from experiments with diploids, and theory, which typically assumes haploid selection. Finally, we formulate open questions whose solving would help to outline conditions favoring recombination plasticity. This will contribute to answering the long‐standing question of why sexual recombination exists despite its costs, since plastic recombination may be evolutionary advantageous even in selection regimes rejecting any non‐zero constant recombination. (shrink)

Several philosophers have proposed Knowledge-Based Decision Theories (KDTs)—theories that require agents to maximize expected utility as yielded by utility and probability functions that depend on the agent’s knowledge. Proponents of KDTs argue that such theories are motivated by Knowledge-Reasons norms that require agents to act only on reasons that they know. However, no formal derivation of KDTs from Knowledge-Reasons norms has been suggested, and it is not clear how such norms justify the particular ways in which KDTs relate knowledge and (...) rational action. In this paper, I suggest a new axiomatic method for justifying KDTs and providing them with stronger normative foundations. I argue that such theories may be derived from constraints on the relation between knowledge and preference, and that these constraints may be evaluated relative to intuitions regarding practical reasoning. To demonstrate this, I offer a representation theorem for a KDT proposed by Hawthorne and Stanley (2008) and briefly evaluate it through its underlying axioms. -/- In section 1, I present knowledge-based decision theories generally and the versions of such theories suggested in the literature. In section 2, I argue that KDTs and theories of practical reasoning conjoined with Knowledge-Reasons norms generate constraints on the same relation—the relation between knowledge and preference. In section 3, I present a formal framework in which constraints on this relation may be expressed and from which KDTs may be derived. In section 4, I present a representation theorem for a specific KDT. In section 5, I briefly evaluate the axioms of the theory, and in section 6, I conclude. (shrink)

We study the representation of attitudes to risk in Jeffrey’s decision-theoretic framework suggested by Stefánsson and Bradley :602–625, 2015; Br J Philos Sci 70:77–102, 2017) and Bradley :231–248, 2016; Decisions theory with a human face, Cambridge University Press, Cambridge, 2017). We show that on this representation, the value of any prospect may be expressed as a sum of two components, the prospect’s instrumental value and the prospect’s intrinsic value. Both components have an expectational form. We also make a distinction between (...) a prospect’s overall intrinsic value and a prospect’s conditional intrinsic value given each one of its possible outcomes and argue that this distinction has great explanatory power. We explore the relation between these two types of intrinsic values and show that they are determined at the level of preferences. Finally, we explore the relation between the intrinsic values of different prospects and point to a strong restriction on this relation that is implicit in Jeffrey’s axioms. We suggest a natural interpretation to this restriction. (shrink)

Aristotle in Physics I,1 says some strange-sounding things about how we come to know wholes and parts, universals and particulars. In explicating these, Simplicius distinguishes an initial rough cognition of a thing as a whole, an intermediate “cognition according to the definition and through the elements,” and a final cognition of how the thing's many elements are united: only this last is πιστήμη. Simplicius refers to the Theaetetus for the point about what is needed for πιστήμη and the ways that (...) cognition according to the definition and through the elements falls short. By unpacking this reference I try to reconstruct Simplicius' reading of “Socrates' Dream,” its place in the Theaetetus ' larger argument, and its harmony with other Platonic and Aristotelian texts. But this reconstruction depends on undoing some catastrophic emendations in Diels's text of Simplicius. Diels's emendations arise from his assumptions about definitions and elements, in Socrates' Dream and elsewhere, and rethinking the Simplicius passage may help us rethink those assumptions. (shrink)

At the beginning of Posterior Analytics 2.19 Aristotle reminds us that we cannot claim demonstrative knowledge unless we know immediate premisses, the archai of demonstrations. By the end of the chapter he explains why the cognitive state whereby we get to know archai must be Nous. In between, however, Aristotle describes the process of the acquisition of concepts, not immediate premisses. How should we understand this? There is a general agreement that it is Nous by means of which we acquire (...) both premisses and concepts. I argue that this cannot be the case. Since concepts are simples while premisses are composites , the two cannot be objects of the same cognitive state. I further argue that, whereas Nous is responsible for our grasp of concepts, the state Aristotle elsewhere calls non-demonstrable knowledge is the one whereby we get to know the premisses of demonstrations. (shrink)

The broad, ancient notion of the “soul” was replaced by Descartes with a more narrow notion of the “mind.” As well as limiting the scope of the soul, Descartes separated it from the body, giving the soul a substantive status. These two features gave rise to severe conceptual problems which remain unsolved till the present day. I believe that retaining some features of the ancient notion of the “soul”—particularly those found in Aristotle’s view—may resolve many of these problems. As an (...) alternative approach I suggest the following three assumptions concerning the nature of the soul : the soul consists of dispositional and actualized states and not of internal, isolated entities; physiological and mental states are not actually separate but belong to two different levels of description, hence the relation between them is that of correlation and not of causality; mental and physical states can be arranged along a spectrum ranging from simple to more complex states. This approach treats mental properties just as common sense and science treat other natural properties. Thus, many of the traditional problems concerning the mind-body gap disappear. Though the approach presented here returns, in some aspects, to the ancient, broad notion of the soul, I will continue to use the term “mind” which is used more today. (shrink)

The sensation-perception distinction did not appear before the seventeenth century, but since then various formulations of it have gained wide acceptance. This is not an historical accident and the article suggests an explanation for its appearance. Section 1 describes a basic assumption underlying the sensation-perception distinction, to wit, the postulation of a pure sensory stage--viz. sensation--devoid of active influence of the agent's cognitive, emotional, and evaluative frameworks. These frameworks are passive in that stage. I call this postulation the passivity assumption. (...) Section 2 suggests three major reasons for the emergence of this assumption in the seventeenth century: the mental-physical gap, the causal theory of perception, and epistemological considerations regarding the status of the sensory given. In the last section a critical discussion is presented. The passivity assumption is found to have serious empirical and theoretical flaws. (shrink)

In many circumstances compromises seem to be of great value to our well-being; compromises can help us avoid disputes and fights and enable us to live peacefully with each other. However, compromises can also require us to surrender some of our values. These two opposing aspects implicit in compromise express the need to be sensitive to external circumstances and in particular to the wishes of other people, and at the same time to be willing to relinquish something of value. So (...) are compromises, and in particular romantic compromises, good or bad for our well-being? McIntyre’s view in general and Aristotle’s distinction between extrinsically and intrinsically valuable activities in particular, are very useful in this regard. Compromises can be characterized as involving dissatisfied acceptance of a gap between a perceived feasible desire and our actual situation. The acceptance of the gap is merely behavioral stemming from unfavorable external circumstances. It is not psychologically accepted, as deep down we are not happy with the compromise, and still yearning for a better solution. Romantic compromises are particularly hard to accept in light of the prominent place of the Romantic Ideology, in which ideal love can overcome all obstacles and hence there is no place for compromises. (shrink)

Jesus has been accused of committing a fallacy (of denying the antecedent) at John 8:47. Careful analysis of this text (1) reveals a hitherto unrecognized valid form of argument which can superficially look like the predicate-logic analogue of denying the antecedent; (2) shows that determining whether a published text can be fairly charged with committing a fallacy may require (but often does not get) extensive and detailed analysis; (3) acquits Jesus of the charge; and thereby (4) conflnns a claim by (...) Michael Burke that published arguments can seldom be fairly charged with denying the antecedent, or analogous fallacies. (shrink)

Under the post-metaphysical sky “old” humanistic-oriented education is possible solely at the cost of its transformation into its negative, into a power that is determined to diminish human potentials for self-exaltation. Nothing less than total metamorphosis is needed to rescue the core of humanistic genesis: the quest for edifying Life and resistance to the call for “home-returning” into the total harmony that is promised to us within nothingness.

The relationship between emotions and argumentation is not always clear. I attempt to clarify this issue by referring to three basic questions: (1) Do emotions constitute a certain kind of argumentation?; (2) Do emotions constitute rational argumentation?; (3) Do emotions constitute efficient argumentation? I will claim that there are many circumstances in which the answer to these questions is positive. After describing such circumstances, the educational implications of the connection between emotions and argumentation will be indicated.

Students systematically and deliberately apply rule‐based but erroneous algorithms to solving unfamiliar arithmetic problems. These algorithms result in erroneous solutions termed rational errors. Computationally, students' erroneous algorithms can be represented by perturbations or bugs in otherwise correct arithmetic algorithms (Brown & VanLehn, 1980; Langley & Ohilson, 1984; VanLehn, 1983, 1986, 1990; Young S O'Sheo, 1981). Bugs are useful for describing how rational errors occur but bugs are not sufficient for explaining their origin. A possible explanation for this is that rational (...) errors are the result of incorrect induction from examples. This prediction is termed the “induction hypothesis” (VanLehn, 1986). The purpose of the present study was to: (a) expand on post formulations of the induction hypothesis, and (b) use a new methodology to test the induction hypothesis more carefully than has been done previously. The first step involved teaching participants a new number system called NewAbacus, a written modification of the abacus system. The second step consisted of dividing them into different groups, where each individual received an example of only one port of the NewAbacus addition algorithm. During the third and final step, participants were instructed to solve both familiar and unfamiliar types of addition problems in NewAbacus. The induction hypothesis was supported by using both empirical and computational investigations. (shrink)

In this work I reject the contention that there is a perceptual stage which is devoid of contributions from the agent's cognitive framework. This contention is expressed in two different noncognitive views of perception. The traditional sensory core view which has prevailed since the seventeenth century; it claims that there is a stage of pure sensory core which precedes the interpretive percepts . The recent ecological approach whose main representative is J. J. Gibson; it claims that not only a certain (...) perceptual stage, but the whole perceptual process, is devoid of cognitive contributions. Before I deal with these views, I discuss the basic features of cognition in general. ;Cognition is concerned with the establishment of relations and order; it is a purposive placing of a cognized object into a meaningful order. Cognition begins with modifying a given order for the purpose of making it fit into a given meaningful framework. Throughout the work I show that, contrary to the aforementioned noncognitive views, perception fulfills this depiction of cognition. ;In the discussion of the sensory core view, I illustrate its main assumptions in various philosophical writings, and then indicate main reasons for its appearance in the seventeenth century. These reasons stem from the intermediate role sensation was supposed to have in the mental-physical gap. Sensations were considered to be primitive mental entities with physical causes; their physical origin prevents them from containing complex mental features such as the cognitive ones, and, thus, they are regarded as pure. This stage of pure sensation was postulated primarily out of theoretical considerations. Those did not coincide with the empirical and phenomenological description of that stage; hence, the empirical characterization and the phenomenological status of that stage were constantly modified. The various suggestions for describing that stage are examined and criticized from both empirical and theoretical respects. The empirical evidence presented indicates that there is no qualitative difference between perceiving what is regarded as pure sensations and what is regarded as inferential perceptions. The theoretical criticism points out that the assumption regarding pure sensation is not necessary for an adequate explanation of perception; and, since it has no empirical grounds, it is superfluous. ;After rejecting the sensory core view, I examine the ecological approach. This view rejects the traditional sensation-perception distinction and contends that we do not have to assume the existence of cognitive activities that interpret meaningless sensations into meaningful perceptions, since the perceiver directly encounters meaningful features. I claim that this solution is similar to Kant's approach, and, therefore, it has to pay a price which is similar to that which Kant pays, viz. the relational nature of the perceptual environment. The neglect of this feature results in unsolvable difficulties in central notions of the ecological approach. ;I conclude the work by suggesting a crude outline for approaching perception; in many respects it is close to Aristotle's view. I contend that causal explanations of the physiological processes cannot wholly explain perceiving; these processes are necessary supportive bases for perceiving and not the causes which precede and produce it. Accordingly, we should not assume the existence of separate percepts in the agent's head. The cognitive system is an integral part of the perceptual system; hence, perception may be conceived of as direct understanding. (shrink)

A model of a spatio-cultural sub-context (enfolded in a wider scope context) is presented in the form of a blue print of a Complex System with a two-stage decision engine at its core. The engine first attaches a meaning to analyzable datum, and then decides whether to keep or change it. It does not alter already stored meanings but is designed to search for data to be converted into additional stored meanings and improve the accuracy of correspondence of their spatial (...) and cultural range of relevance. Meaning is reduced to the choice of a strategy—a future continuum of events; a choice dependent on a unique Evolutionary Path, a past continuum of events specific enough to lead to the current temporarily stable state of a spatio-cultural category. It is a blue print for a program that can emulate decisions to initiate changes in the environment in which a collective of culture partners resides; changes consisting of movements from one location to another or in the layout of its current location. The model is proposed at a low cultural resolution and is applicable, after suitable modifications, to a majority of city/period pairs. However, any such model has to be city/period specific. It is illustrated with a design for analyzing changes in the Israeli city, in particular in Tel Aviv. (shrink)

The article discusses the possible “physical” meaning of the distance between genetic sequences, based on comparing the set of all words of fixed length occurring in two genomic sequences. The considered distances suitable describe phylogenetic relationships and allow ranking by the genomes similarities in situations where it is practically impossible to provide by alignment methods. A simulation shows that the distances between the N-gram distributions change almost linearly, with genome lengths growing for relatively small artificial evolutionary modifications. In the general (...) case of comparing two genetic texts, a function for “calibrating” the distance between N-gram distributions is found. This fact makes it possible to interpret the considered distances by means of the number of elementary operators performed in an alignment process between the compared sequences. (shrink)

Conference held June 1990 under the auspices of the Israel Academy of Sciences and Humanities and the Hebrew University of Jerusalem.

On the basis of a case study of the integration of Haredi Jewish women into the Israeli high-tech industry, we explore how gender–religiosity intersectionality affects ultra-conservative women’s participation in the labor market and their ability to negotiate with employers for corporate work–family practices that address their idiosyncratic requirements. We highlight the importance of pious women’s affiliation to their highly organized religious communities while taking a process-centered approach to intersectionality and focusing on the matrix of domination formed by the Israeli state, (...) employers, and the organized ultra-orthodox community. We dub this set of actors “the unholy-trinity” and argue that it constructs a specific, religion-centric inequality regime that restrains women’s job and earning opportunities. At the same time, the “unholy trinity” also empowers women in their struggle to create a working environment that is receptive to their religiosity and what that commitment demands of them. (shrink)

In this masterful work of historical scholarship, Zeev Sternhell, an internationally renowned Israeli political scientist and historian, presents a controversial new view of the fall of democracy and the rise of radical nationalism in the twentieth century. Sternhell locates their origins in the eighteenth century with the advent of the Anti-Enlightenment, far earlier than most historians. The thinkers belonging to the Anti-Enlightenment represent a perspective that is antirational and that rejects the principles of natural law and the rights of (...) man. Sternhell asserts that the Anti-Enlightenment was a development separate from the Enlightenment and sees the two traditions as evolving parallel to one another over time. He contends that J. G. Herder and Edmund Burke are among the real founders of the Anti-Enlightenment and shows how that school undermined the very foundations of modern liberalism, finally contributing to the development of fascism that culminated in the European catastrophes of the twentieth century. (shrink)