An experimental analysis of electricity conservation procedures

Daily electricity consumption of four families was recorded for 106 days. A reversal design, consisting of various experimental conditions interspersed between repeated baseline conditions, was used. During experimental conditions, daily prompts (written conservation slogans attached to front doors) and/or daily feedback (daily kilowatts consumed and daily cost information) were in effect. Maximum consumption occurred during the initial baseline; minimum consumption occurred during different experimental conditions for different families. The mean decrease from the maximum to the minimum for all families was 35%. Reversals in consumption were demonstrated in three families, although successive baselines tended to decrease. No clear differences in effectiveness between prompting and feedback conditions were apparent. The procedures used resulted in considerable dollar savings for the families.     

When does grouping happen?

Recent research on perceptual grouping is described with particular emphasis on identifying the level(s) at which grouping factors operate. Contrary to the classical view of grouping as an early, two-dimensional, image-based process, recent experimental results show that it is strongly influenced by phenomena related to perceptual constancy, such as binocular depth perception, lightness constancy, amodal completion, and illusory contours. These findings imply that at least some grouping processes operate at the level of phenomenal perception rather than at the level of the retinal image. Preliminary evidence is reported showing that grouping can affect perceptual constancy, suggesting that grouping processes must also operate at an early, preconstancy level. If so, grouping may be a ubiquitous, ongoing aspect of visual organization that occurs for each level of representation rather than as a single stage that can be definitively localized relative to other perceptual processes.     

Inverting the Object of Study: Recalibrating the Frame of Reference in Study Abroad Experiences

This essay is concerned with study abroad experiences as opportunities for student cognitive development, using the interpretive lens of educational psychologist William G. Perry. A standard and often valuable assignment in courses on world religions is a site visit to a religious institution in one's local area. This may concretize otherwise abstract materials and help students reflect on ways in which the lived experience of religion differs from its presentation in course texts and other academic materials. Increasingly, study abroad trips are being offered as extended and more intensive ways of bringing this material to life, offering students opportunity to see lived religion within another cultural framework. At the heart of this paper is the contention that such study abroad experiences function not simply as longer, more intense versions of site visits but, rather, as experiences that invert the subject and object of study. The worldview of the student becomes a primary object of study, which is examined, as it were, by the particulars of the religion(s) under investigation and the cultures of which said religion(s) are a part. Where site visits offer students an opportunity to visit the strange amidst the familiar, study abroad trips provide opportunities for students to become the strange within a recalibrated familiar. The subject becomes the object and is interrogated by the context of study. While local, stateside site visits can offer a degree of such dislocation, their brevity, together with some degree of assimilation to the larger culture flows on the part of the local religious institution being visited, most often mitigates any significant inversion. Students generally see such institutions as either mildly or wildly exotic, but always within their frame of reference, which constitutes the norm. When abroad, the normative experience of students is often subverted in ways that lay bare the assumptions behind such views and makes possible another world in which to live. Simply put, the subject and object of study change places. If this inversion is carefully attended to, it can provide rich insight into not only the topics nominally being studied but also occasion opportunity for real cognitive development on the part of the student. This essay is published alongside of six other essays, including a response from John Barbour, comprising a special section of the journal (see Teaching Theology and Religion 18:1, January 2015).     

Reference frames in mental rotation

Four experiments are reported that investigate whether images or reference frames are transformed during a mental rotation task. In all experiments a display of four identical letters (P1) was presented at either +90 degrees or -90 degrees from upright, and subjects had to decide whether the letters were normal or mirror-image reflections. A single letter (P2) was then presented 100 ms later in a variable orientation with the same task instructions. Reaction times to P2 were assessed to determine whether an image of P2 was rotated to upright or whether an internal reference frame was rotated into congruence with P2 from the orientation of P1. The results as a whole suggest that transformations of P2 can be initiated either relative to upright or relative to the orientation of P1. They further indicate that the probability of using each reference orientation can be changed by procedural variations. The findings are most parsimoniously interpreted as suggesting that mental rotation involves the transformation of reference frames rather than the transformation of template-like representations.     

How is a trumpet known? The "basic object level" concept and perception of musical instruments

What are the object properties that serve as a basis for the musical instrument classification system, and how do general and specific experience affect knowledge of these properties? In the first study, the multimodal quality of properties underlying children's and adults' perception was investigated. Subjects listened to solos and identified instruments producing the sounds. Even children who did not have experience with all the instruments correctly identified the family of instruments they were listening to. The hypothesis of the second study, that musical instrument families function as a "basic level" in the instrument taxonomy, was confirmed. Variation in the basic level with varying expertise was documented in the third study with musicians. In the fourth study, children and adults identified the source of sounds from unfamiliar objects, Chinese musical instruments. It is suggested that the concept of affordances may be relevant for understanding the importance for behavior of different levels of abstraction of category systems.