Hume's Explanations of Meaningless Beliefs

Hume's arguments to meaninglessness are too strong for his purposes; they are accompanied by psychological explanations of why we believe in entities that fall under the meaningless expressions. How can Hume consistently provide explanations of beliefs that are without meaning in the first place? Though not derived from experience in accordance with Lockean empiricism about meaning, the relevant expressions must possess some surrogate for meaning or content-like features. For Hume, such quasi -content is the product of a retreat, under the pressure of a conflict, from an illusion to a conceptual confusion that obscures the conflict; different quasi -contents result from different illusions. The notions of material substrata , souls and external existence, which some commentators treat as tolerably meaningful 'relative ideas', are confused quasi -concepts, defective in meaning. A reconstruction of Treatise I iii 14 shows that necessary connection may be seen as parallel to these other cases.     

Backward interference by tones or noise in pitch perception as a function of practice

In a first experiment, the identification of brief tonal stimuli was unaffected by subsequent presentation of white noise. However, subsequent pure tones, whether central to the stimulus frequencies or remote from them, caused substantial declines in correct identification. Apparent backward masking seems therefore to follow rather than to precede some degree of categorization of the masking stimulus. A second experiment shows that even these effects are temporary. Early masking effects are heavily modified by practice, and are not therefore permanent features of sensory processing. Neither experiment provides support for preperceptual theory.     

Psychoanalytic observations on the effect of lithium on manic attacks

This paper describes a predictable relation between our manic-depressive patients' blood lithium levels and particular changes in their conscious and unconscious mental processes (i.e., their thoughts, wishes, fantasies, inclinations, and feelings). These changes were, in turn, predictively related to specific changes in these patients' overt manic symptomatology. Because each of our patients' manic episodes was heralded by a marked increase in unconscious or conscious phallic sexual thoughts, feelings, and behaviors, and because this increase preceded any observed deterioration in ego or superego functioning, we hypothesize that a primary increase in our patients' phallic instinctual drives secondarily overwhelmed the capacity of their egos to defend against these drives, and that this, in turn, resulted in the development of our patients' overt manic symptoms. Psychoanalysis (or psychoanalytically oriented psychotherapy) made our patients consciously aware both of their previously unconscious phallic sexual thoughts and impulses, and of their defenses against them. This new awareness enabled our patients to recognize when their, now conscious, phallic sexual impulses and thoughts became inappropriately intensified; and this, in turn, permitted them to avoid overt manic episodes by counteracting these inappropriate inclinations with increased doses of lithium.     

Bayesian Latent Class Analysis Tutorial

This article is a how-to guide on Bayesian computation using Gibbs sampling, demonstrated in the context of Latent Class Analysis (LCA). It is written for students in quantitative psychology or related fields who have a working knowledge of Bayes Theorem and conditional probability and have experience in writing computer programs in the statistical language R. The overall goals are to provide an accessible and self-contained tutorial, along with a practical computation tool. We begin with how Bayesian computation is typically described in academic articles. Technical difficulties are addressed by a hypothetical, worked-out example. We show how Bayesian computation can be broken down into a series of simpler calculations, which can then be assembled together to complete a computationally more complex model. The details are described much more explicitly than what is typically available in elementary introductions to Bayesian modeling so that readers are not overwhelmed by the mathematics. Moreover, the provided computer program shows how Bayesian LCA can be implemented with relative ease. The computer program is then applied in a large, real-world data set and explained line-by-line. We outline the general steps in how to extend these considerations to other methodological applications. We conclude with suggestions for further readings.     

Variation in performance on auditory and visual monitoring tasks as a function of signal and stimulus frequencies

Observers were required to detect double jumps of a diffuse light spot jumping in a circular pattern and more intense noise pulses in a pulse train. Seven groups performed at different combinations of stimulus and signal frequencies, higher signal frequency/stimulus frequency ratios, and lower stimulus frequencies. Stimulus frequency was a more potent determiner of performance than signal frequency, and performance was not invariant within a given signal frequency/stimulus frequency ratio. Correlations of dependent measures were also examined.-Results are discussed with reference to various theories of vigilance behavior.     

Index to Volume 117

In some individuals, noise appears to have an adverse effect on memory recall. This decrement may result from a shift in the memory strategy being employed. Studies have shown memory strategies used by persons with an internal locus of control differ from those used by persons with an external locus of control. The present investigation asked subjects who were classified as either internal or external in locus of control to recall words presented under conditions of noise and of quiet. Word recall was aided by providing subjects with potential memory strategies. Each word list included words from meaningful content categories (which favor a semantic strategy) and word pairs that rhymed (which favor a perceptual strategy). Though internal and external subjects did not differ in total words recalled, they did differ in their use of strategies. Whereas internal subjects' strategies were unaffected by noise, external subjects decreased their use of the higher level semantic memory strategy (content categories) and increased their use of lower level perpetual (rhymes) strategy in the noise condition. The results are discussed in terms of a differential arousal hypothesis.