Retroactive interference in short-term memory and the word-length effect

Two experiments investigated the possibility that the word-length effect in short-term memory (STM) is a consequence of long words generating a greater level of retroactive interference than shorter words. In Experiment 1, six-word lists were auditorily presented under articulatory suppression for immediate serial reconstruction of only the first three words. These three words were always drawn from a single set of middle-length words, whereas the last three positions were occupied by either short or long interfering words. The results showed worse memory performance when the to-be-remembered words were followed by long words. In Experiment 2, a recent-probes task was used, in which recent negative probes matched a target word in trial n-2. The results showed lower levels of proactive interference when trial n-1 involved long words instead of short words, suggesting that long words displaced previous STM content to a greater extent. By two different experimental approaches, therefore, this study shows that long words produce more retroactive interference than short words, supporting an interference-based account for the word-length effect.     

Some Uses of Logic in Rigorous Philosophy

This paper is concerned with the use of logic to solve philosophical problems. Such use of logic goes counter to the prevailing empiricist tradition in analytic circles. Specifically, model-theoretic tools are applied to three fundamental issues in the philosophy of logic and mathematics, namely, to the issue of the existence of mathematical entities, to the dispute between first- and second-order logic and to the definition of analyticity.     

The effect of word length in short-term memory: Is rehearsal necessary?

Three experiments investigated the effect of word length on a serial recognition task when rehearsal was prevented by a high presentation rate with no delay between study and test lists. Results showed that lists of short four-phoneme words were better recognized than lists of long six-phoneme words. Moreover, this effect was equivalent to that observed in conditions in which there was a delay between lists, thereby making rehearsal possible in the interval. These findings imply that rehearsal does not play a central role in the origin of the word length effect. An alternative explanation based on differences in the degree of retroactive interference generated by long and short words is proposed.     

Paraconsistent Metatheory: New Proofs with Old Tools

Journal of Philosophical Logic - This paper is a step toward showing what is achievable using non-classical metatheory—particularly, a substructural paraconsistent framework. What standard...     

The role of domain-specific practice, handedness, and starting age in chess

The respective roles of the environment and innate talent have been a recurrent question for research into expertise. The authors investigated markers of talent, environment, and critical period for the acquisition of expert performance in chess. Argentinian chess players (N = 104), ranging from weak amateurs to grandmasters, completed a questionnaire measuring variables including individual and group practice, starting age, and handedness. The study reaffirms the importance of practice for reaching high levels of performance, but it also indicates a large variability: The slower player needed 8 times as much practice to reach master level than the faster player. Additional results show a correlation between skill and starting age and indicate that players are more likely to be mixed-handed than individuals in the general population; however, there was no correlation between handedness and skill within the sample of chess players. Together, these results suggest that practice is a necessary but not sufficient condition for the acquisition of expertise, that some additional factors may differentiate chessplayers and nonchessplayers, and that starting age of practice is important.     

Two Dimensions of the Ethical Problems Related to Nanotechnology

The current literature on nanoethics focuses on a wide array of topics such as equity, privacy, military, environment, human enhancement, intellectual property, and security. The identification of those topics leads to the adoption of an ethical stance, which we call the in itself dimension. In this article we argue that even though it is correct to identify the areas where ethical problems are imperative to deal with (in itself dimension), it is a partial approach. This is because the in itself dimension pays no attention to another ethical stance; one that does not have anything to do with individual or collective responsibilities, but rather with the socio-economic system into which those responsibilities are embedded. We call this second issue the contextual dimension.     

Couple interaction: A study of the punctuation process

This study examined couples' punctuation of their own interactions. The association between causal explanations for the interactions on issues involving differences and the nature of relatedness (i.e., degree of distress) was the major purpose of the study. Punctuation was defined as a way of grouping sequences of interactions. Punctuational differneces were operationalized by measuring couples' causal explanations and attributions of responsibility concerning their own interactions. Twenty distressed and non-distressed couples, matched on age, income, education, and length of relationship, participated in an intensive 3-hour interview conducted at their homes. Two relationship measures to determine the degree of distress were administered. The interview involved: generating issues of important differences, improvisational role plays of interactions, responses to open-ended questions about self and other perspectives, and rankings of causal explanations and attributions of responsibility about the interactions. The results suggested that the nature of relatedness, as defined by degree of distress, was associated with the punctuation of interactions by the communicators, tentatively supporting the Watzlawicket al. (1967) metacommunicational axiom. The main finding was that distressed couples attributed responsibility to the mate rather than self, whereas in nondistressed douples responsibility was shared.This article is based on a doctoral dissertation submitted to the University of Massachusetts, Amherst. The senior author is affiliated with the Department of Psychiatry, University of California, San Francisco