Abduction by Philosophers: Reorienting Philosophical Methodology

A reorientation is needed in methodological debate about the role of intuitions in philosophy. Methodological debate has lost sight of the reason why it makes sense to focus on questions about intuitions when thinking about the methods or epistemology of philosophy. The problem is an approach to methodology that focuses almost exclusively on questions about some evidential role that intuitions may or may not play in philosophers’ arguments. A new approach is needed. Approaching methodological questions about the role of intuitions in philosophy with an abductive model of philosophical inquiry in mind will help ensure the debate doesn't lose sight of what motivates the debate.     

Prima facie obligation

This paper presents a nonmonotonic deontic logic based on commonsense entailment. It establishes criteria a successful account of obligation should satisfy, and develops a theory that satisfies them. The theory includes two conditional notions of prima facie obligation. One is constitutive; the other is epistemic, and follows nonmonotonically from the constitutive notion. The paper defines unconditional notions of prima facie obligation in terms of the conditional notions.     

Evaluation of Peer Training for Teaching Abduction Prevention Skills

Child abduction is a serious problem, with approximately 100 children killed each year by nonfamily abductors. Training programs to teach children the correct skills to use if they ever come into contact with a stranger can be effective when they incorporate behavioral skills training (BST) and in-situ training (IST) into their protocol. However, these methods can be rather time and energy consuming. The current study evaluated the effectiveness and efficiency of a peer tutoring approach to teaching abduction prevention skills. Peer trainers implemented BST sessions and IST sessions with their younger peers. Children successfully acquired the target safety behaviors taught by the peer trainers, and use of the skills generalized to their natural environment.     

Embedding Modal Nonmonotonic Logics into Default Logic

We present a straightforward embedding of modal nonmonotonic logics into default logic.     

When Is Genetic Reasoning Not Fallacious?

Attempts to evaluate a belief or argument on the basis of its cause or origin are usually condemned as committing the genetic fallacy. However, I sketch a number of cases in which causal or historical factors are logically relevant to evaluating a belief, including an interesting abductive form that reasons from the best explanation for the existence of a belief to its likely truth. Such arguments are also susceptible to refutation by genetic reasoning that may come very close to the standard examples given of supposedly fallacious genetic reasoning.     

Evaluating the Effectiveness of an Abduction Prevention Program for Young Adults With Intellectual Disabilities

The purpose of this study was to evaluate the effectiveness of behavioral skills training (BST) and in situ training (IST) for teaching abduction prevention skills to young adults with intellectual disabilities. Four individuals, ages 18–24, participated. Five BST sessions were conducted for each participant. Following BST, in situ assessments took place at the participants’ school to assess acquisition of the skills. The data show that none of the participants reached criterion level following BST although some of the participants improved their score from baseline. IST was then implemented with two of the participants achieving criterion level and two participants exhibiting two of the three safety skills.     

Representing Meta-Knowledge in Poole-Systems

We show how Poole-systems, a simple approach to nonmonotonic reasoning, can be extended to take meta-information into account adequately. The meta-information is used to guide the choice of formulas accepted by the reasoner as premises. Existence of a consistent set of conclusions is guaranteed by a least fixpoint construction. The proposed formalism has useful applications in defeasible reasoning, knowledge base fusion and belief revision.     

Resource-origins of Nonmonotonicity

Formal nonmonotonic systems try to model the phenomenon that common sense reasoners are able to “jump” in their reasoning from assumptions Δ to conclusions C without their being any deductive chain from Δ to C. Such jumps are done by various mechanisms which are strongly dependent on context and knowledge of how the actual world functions. Our aim is to motivate these jump rules as inference rules designed to optimise survival in an environment with scant resources of effort and time. We begin with a general discussion and quickly move to Section 3 where we introduce five resource principles. We show that these principles lead to some well known nonmonotonic systems such as Nute’s defeasible logic. We also give several examples of practical reasoning situations to illustrate our principles. Edited by Hannes Leitgeb     

A Nonmonotonic Modal Formalization of the Logic of Acceptance and Rejection

The problems we deal with concern reasoning about incomplete knowledge. Knowledge is understood as ability of an ideal rational agent to make decisions about pieces of information. The formalisms we are particularly interested in are Moore's autoepistemic logic (AEL) and its variant, the logic of acceptance and rejection (AEL2). It is well-known that AEL may be seen as the nonmonotonic KD45 modal logic. The aim is to give an appropriate modal formalization for AEL2.     

The Effectiveness of Victim Resistance Strategies against Stranger Child Abduction: An Analysis of Attempted and Completed Cases

Existing research, policy information, and materials intended to teach child safety assumes that certain behaviours will protect children in the event that a stranger tries to abduct them. However, there is little empirical basis for these assumptions. This paper examines the effectiveness of strategies thought to increase the likelihood that a child will be able to resist an attempted stranger child abduction event. Seventy‐eight cases of stranger child abduction that occurred in the UK between 1988 and 2014, including 25 attempted cases and 53 completed cases, were examined in order to ascertain the relative prevalence of various resistance types and to assess their effectiveness of six key resistance strategies based on whether the presence or absence affected the outcome of the abduction. Results show that direct, unequivocal verbal resistance, running away, and a composite approach where the victim runs away, calls for help, and reports the offence were highly effective means of resisting an offender, whereas physical resistance, indirect verbal resistance, and non‐resistance were not effective. Female victims were almost twice as likely to employ any kind of resistance strategy against an offender as male victims were. The implications of these findings for augmenting ways in which children are taught about safety are discussed. Copyright © 2016 John Wiley & Sons, Ltd.