Aristotle's Syllogistic and Core Logic

I use the Corcoran–Smiley interpretation of Aristotle's syllogistic as my starting point for an examination of the syllogistic from the vantage point of modern proof theory. I aim to show that fresh logical insights are afforded by a proof-theoretically more systematic account of all four figures. First I regiment the syllogisms in the Gentzen–Prawitz system of natural deduction, using the universal and existential quantifiers of standard first-order logic, and the usual formalizations of Aristotle's sentence-forms. I explain how the syllogistic is a fragment of my (constructive and relevant) system of Core Logic. Then I introduce my main innovation: the use of binary quantifiers, governed by introduction and elimination rules. The syllogisms in all four figures are re-proved in the binary system, and are thereby revealed as all on a par with each other. I conclude with some comments and results about grammatical generativity, ecthesis, perfect validity, skeletal validity and Aristotle's chain principle.     

Age-related Changes in Memory and Fluid Reasoning in a Sample of Healthy Old People

ABSTRACT

Participants in the Healthy Old People in Edinburgh (HOPE) study (N = 398) were assessed on Raven's Progressive Matrices and Logical Memory on up to three occasions. Covariates included education, social class, disease and medication status, blood pressure and study outcome. Raven's score declined linearly with age, whereas decline in Logical Memory was accelerating. There was significant variation in individuals' rates of decline for Ravens but not Logical Memory. Slope–intercept covariances were not significant. Those who later developed dementia already exhibited lower scores, more so for Logical Memory than Raven's. Death and study attrition were related to performance, again greater for Logical Memory. Conclusions: The HOPE approach of progressive screening is a feasible and practical method for studying healthy cognitive ageing. As predicted for an initially healthy sample, rates of decline were relatively homogeneous. The hypothesis of differential decline was not supported, nor was a strict interpretation of the hypothesis that cognitive ageing is entirely pathology driven.     

Attachment Theory as a Framework for Understanding Responses to Social Exclusion

We argue that attachment theory may provide a useful framework for understanding individuals' reactions to social exclusion. Attachment theory suggests that social exclusion should prompt an individual to seek comfort from an accepting attachment figure. However, most experimental studies constrain individuals from seeking out an attachment figure to quell their distress, and may interfere with the process of recruiting internalized attachment figures. When the goal of recruiting attachment figure support is blocked, individuals may adopt deactivating strategies, such as emotional numbing, to reduce their distress. Alternatively, individuals may adopt hyperactivating strategies, such as ingratiating behaviors, to seek proximity to attachment figure substitutes. We conclude with recommendations for future avenues of exclusion research stemming from attachment theory.     

Working memory in event‐ and time‐based prospective memory tasks: Effects of secondary demand and age

An experiment is reported examining the role of working memory in two laboratory‐based prospective memory (PM) tasks. Participants viewed a film for a later recognition memory task while simultaneously monitoring auditorially presented arithmetic problems for incorrect solutions. The arithmetic verification task was either low demand or high demand. In addition, participants were required either to indicate whenever an animal appeared in the film (event‐based PM task), or whenever 3 min had elapsed (time‐based PM task). PM performance was higher when the arithmetic task was low demand than when it was high demand. Young participants were more successful in both PM tasks than older participants, but only under high demand. Age did not interact with PM task type overall, and the young participants were faster overall in both types of PM task. Taken together, the results indicate that working memory plays an important role in PM tasks.     

Predictors of representational aggression in preschool children of low‐income urban African American adolescent mothers

Responses to five doll‐story stems thematically related to attachment experiences with the mother were videotaped in the home and used to evaluate child, maternal, and environmental predictors of representational aggression in 93 preschool children of African American women receiving public assistance who had become pregnant as teenagers. Significant correlations were found between representational aggression and child's gender (male), birth weight, maternal depressive affect, maternal educational attainment, recent employment, mother's historical residence with her own mother, and felt social support, accounting for 40% of the variance in representational aggression. A significant Felt Social Support × Gender interaction effect suggested that girls of mothers who perceive higher levels of felt social support are more likely to represent less aggression in their stories; felt social support was not associated with boys' representational aggression. A significant Felt Social Support × Employment interaction effect suggested that representational aggression is associated with lower levels of felt social support only among employed mothers. Findings suggest that different pathways exist for representational aggression in children of low‐income adolescent mothers, which nevertheless share predictors associated with poverty.     

Planning and Problem solving Using the Five disc Tower of London Task

This paper investigates the planning and problem-solving abilities of normal adult subjects using a complex version of Shallice's (1982, 1988) Tower of London (TOL) task. Subjects were required to plan a fluent solution to a range of 5-disc TOL puzzles and then execute their formulated plans as fast as possible. The number of errors and the times taken to prepare the most efficient solutions increased monotonically with the number of chunks of subgoal moves. A subgoal move is a move that is essential for the solution of the puzzle, but which does not place a disc into its goal position. A subgoal chunk is a consecutive series of subgoal moves that all transfer discs to and from the same pegs. Furthermore, preparation time was found to be sensitive to a manipulation that increased the number of competing alternative choices, at critical steps in move selection. When subjects planned their action sequences 'on-line', analyses of individual moves and individual move latencies suggested that planning TOL solutions was limited by the difficulty in evaluating and selecting one action (or one subgoal chunk) from the set of competing potential actions at each step in the course of problem solving.     

Moving From Classical Test Theory to the Evaluation of Usefulness: A Theoretical and Practical Examination of Alternative Approaches to the Development of Career Tools for Job Seekers

This article critiques the common use of principles of classical test theory (CTT) as the key means of assessing the effectiveness of career instruments for employment counseling. The authors argue that excessive reliance on CTT has hindered the development of career assessment tools that better meet the diverse and changing needs of those seeking guidance in their career choice. The authors argue for an alternative paradigm based on notions of usefulness. A computerized career tool is evaluated to illustrate the limitations of CTT and the benefit of alternative methodologies for the assessment of instruments designed to provide effective career guidance.     

The closing of the theory of mind: A critique of perspective-taking

Theory of mind (ToM) is defined as the ability to attribute mental states to oneself and others and is often said to be one of the cornerstones of efficient social interaction. In recent years, a number of authors have suggested that one particular ToM process occurs spontaneously in that it is rapid and outside of conscious control. This work has argued that humans efficiently compute the visual perspective of other individuals. In this article, we present a critique of this notion both on empirical and theoretical grounds. We argue that the experiments and paradigms that purportedly demonstrate spontaneous perspective-taking have not as yet convincingly demonstrated the existence of such a phenomenon. We also suggest that it is not possible to represent the percept of another person, spontaneous or otherwise. Indeed, the perspective-taking field has suggested that humans can represent the visual experience of others. That is, going beyond assuming that we can represent another’s viewpoint in anything other than symbolic form. In this sense, the field suffers from the same problem that afflicted the “pictorial” theory in the mental imagery debate. In the last section we present a number of experiments designed to provide a more thorough assessment of whether humans can indeed represent the visual experience of others.