The centroid paradigm: Quantifying feature-based attention in terms of attention filters

This paper elaborates a recent conceptualization of feature-based attention in terms of attention filters (Drew et al., Journal of Vision, 10(10:20), 1–16, 2010) into a general purpose centroid-estimation paradigm for studying feature-based attention. An attention filter is a brain process, initiated by a participant in the context of a task requiring feature-based attention, which operates broadly across space to modulate the relative effectiveness with which different features in the retinal input influence performance. This paper describes an empirical method for quantitatively measuring attention filters. The method uses a “statistical summary representation” (SSR) task in which the participant strives to mouse-click the centroid of a briefly flashed cloud composed of items of different types (e.g., dots of different luminances or sizes), weighting some types of items more strongly than others. In different attention conditions, the target weights for different item types in the centroid task are varied. The actual weights exerted on the participant’s responses by different item types in any given attention condition are derived by simple linear regression. Because, on each trial, the centroid paradigm obtains information about the relative effectiveness of all the features in the display, both target and distractor features, and because the participant’s response is a continuous variable in each of two dimensions (versus a simple binary choice as in most previous paradigms), it is remarkably powerful. The number of trials required to estimate an attention filter is an order of magnitude fewer than the number required to investigate much simpler concepts in typical psychophysical attention paradigms.     

Is modesty a subdomain of humility?

Although many scholars have sharply distinguished humility from modesty, several research teams recently conceptualized modesty as a subdomain of humility. In the present study, we compare these competing conceptualizations using confirmatory factor analyses. In Study 1, a model with general humility (i.e. second-order factor) predicting the subscales of the Relational Humility Scale (RHS) and the Modesty facet of the HEXACO-PI showed adequate fit; and modesty showed one of the stronger factor loadings on the higher order factor. In Study 2, we used a set of items designed to sharpen the potential distinction between modesty (i.e. interpersonal behavior involving moderating attention to self) and humility. Then, we tested a model with a general humility factor (i.e. second-order factor) predicting subscales of the RHS and modesty items. Once again, modesty items loaded strongly on the higher order factor.     

Networking a computer-aided guidance system within higher education institutions: practice and potential

A number of higher education institutions have networked PROSPECT (HE) to make it available throughout the institution. The impact of such networking was evaluated, based on visits to six of these institutions and on logged statistical data. The rationale for networking, and implementation strategies adopted, are discussed. The quantitative data provided less evidence of the reduced quality of usage than had been anticipated. Qualitative data suggested that networking provided easier access in terms of both location and time: this removed the need to ration usage of the system, thus making it easier to consider opportunities for structured usage, and to justify access to non-core groups. There was no evidence of any reduction in the use of the careers services. Examples are presented of PROSPECT (HE) being linked with a variety of other careers activities. Overall, the evidence suggests that the benefits of networking outweigh the risks.     

Expressing the Nature and Meaning of DNA: Six Books for Teachers and Students

DNA is an important agent not only in chemistry and biology but also in technology and modern culture. A number of books approach the double helix from different angles. These perspectives include (1) the science of DNA and genetics; (2) genetic engineering; (3) the ethics of manipulating genetic material; and (4) DNA in culture and religion. Various views of DNAprovide insights into human nature beyond its molecular composition.