An integrated account of generalization across objects and features

Humans routinely make inductive generalizations about unobserved features of objects. Previous accounts of inductive reasoning often focus on inferences about a single object or feature: accounts of causal reasoning often focus on a single object with one or more unobserved features, and accounts of property induction often focus on a single feature that is unobserved for one or more objects. We explore problems where people must make inferences about multiple objects and features, and propose that people solve these problems by integrating knowledge about features with knowledge about objects. We evaluate three computational methods for integrating multiple systems of knowledge: the output combination approach combines the outputs produced by these systems, the distribution combination approach combines the probability distributions captured by these systems, and the structure combination approach combines a graph structure over features with a graph structure over objects. Three experiments explore problems where participants make inferences that draw on causal relationships between features and taxonomic relationships between animals, and we find that the structure combination approach provides the best account of our data.     

The Guise of the Guise of the Bad

It is undeniable that human agents sometimes act badly, and it seems that they sometimes pursue bad things simply because they are bad. This latter phenomenon has often been taken to provide counterexamples to views according to which we always act under the guise of the good (GG). This paper identifies several distinct arguments in favour of the possibility that one can act under the guise of the bad. GG seems to face more serious difficulties when trying to answer three different, but related, arguments for the possibility of acting under the guise of the bad. The main strategies available to answer these objections end up either undermining the motivation for GG or failing to do full justice to the nature of perverse motivation. However, these difficulties turn out to be generated by focusing on a particular version of GG, what I call the “content version”. But we have independent reasons to prefer a different version of GG; namely, the “attitude version”. The attitude version allows for a much richer understanding of the possibility of acting on what we conceive to be bad. Drawing on an analogy with theoretical akrasia and theoretical perversion, I try to show how the attitude version can provide a compelling account of perverse actions.     

Reconsidering Intentions

This paper argues that the principles of instrumental rationality apply primarily to extended action through time. Most philosophers assume that rational requirements and principles govern in the first instance momentary mental states, as opposed to governing extended intentional actions directly. In the case of instrumental rationality, the relevant mental states or attitudes would typically be preferences, decisions, or intentions. In fact, even those who recognize the extended nature of our agency still assume that rational requirements apply primarily to mental states at a moment in time. Such views try to do justice to the extended nature of our agency by postulating rational requirements that apply in the first instance to plans, policies, and intentions more generally. The paper focuses on the central case of requirements and reasons governing the reconsideration of intentions and argues that these requirements or reasons are either superfluous or invalid. I argue that a proper conception of instrumental reasoning that applies directly to actions turn out to have surprising consequences. In fact, this conception allows us to see that policies, projects and the like are best understood as instances of extended actions, and that the instrumental requirements that apply to projects and policies are exactly the same as the instrumental requirements that apply to ordinary extended actions. Finally, I argue that the resulting theory of instrumental rationality is a significant improvement over theories that rely on principles governing intentions.     

Attention allocation under varied workload and effort perception in rowers

ObjectivesTenenbaum's effort-related model has proposed that as physical workload increases, attention allocation shifts from dissociation to association. Owing to equivocal research results regarding gender and experience differences in attention and perceived exertion reports, this study was designed to examine whether attention allocation varied as a function of perceived effort manipulated by physical workload, and whether gender and experience differences would emerge in regards to attention use.DesignA within-subjects study design was employed using measures of attention, perceived exertion, heart rate, and power output.MethodsSixty high school and collegiate rowers were recruited, and were divided into 30 experienced (15 men and 15 women) and 30 novice rowers (15 men and 15 women). After establishing a maximal power output value for each rower using the rowing ergometer, participants were asked to row at 30%, 50%, and 75% relative workload intensities for 10 min in a counterbalanced order. At each minute, measures of heart rate, attention, and perceived exertion were taken. Participants also recorded their thoughts during the session after each task.ResultsResults demonstrated that attention significantly (p<.01) shifted from dissociation to association as workload increased. The workload increase also resulted in elevated perceived exertion and heart rate. Similarly, thought classifications validated attention shift as workload increased. Experience and gender were not found to be discriminatory factors for attention allocation.ConclusionsAttention shifted from dissociation to association as workload increased; as environmental demands increase, physiological sensations dominate the individual's attention. Attention is forced to shift internally and narrow (i.e., associative) to adapt to these demands. During low or moderate workload, attention can be more flexible and voluntarily shift between associative and dissociative modes because the task demands are not overwhelming.     

Factors Affecting Universal Precautions Compliance

This study characterizes levels of self-reported compliance with Universal Precautions (UP) among health care workers (HCWs) at risk of bloodborne exposure. A convenience survey was conducted of 1135 health care workers, expected to be at high risk for transmission of bloodborne pathogens. Using a cross-sectional design and a theoretical model by Gershon et al. (1995) data were analyzed with logistic regression. Factors associated with at least one of the two measures of HCW compliance with UP included longer tenure in one's job, increased knowledge of human immunodeficiency virus (HIV) transmission, a conservative attitude toward risky behaviors, a perception of a strong organizational safety climate, and having had some training in the use of personal protective equipment. Knowledge of factors associated with compliance helps to explain why health care workers sometimes exhibit poor compliance despite the real occupational hazard posed by exposure to bloodborne pathogens.