On-Line Updating of Spatial Information Druing Locomotion Without Vision

Two experiments are reported in which the control of locomotion without vision was investigated. In Experiment 1, subjects (N = 10) made similar, although less functional, locomotor adjustments when walking without vision to a target than they did when walking with vision. That result suggests that while walking without vision, the subjects updated their positions on-line with respect to a representation of the target rather than operating from a preformulated action plan. In Experiment 2, there was a significant weakening and loss of functionality of the locomotor adjustments when subjects (N = 10) had to walk without vision the correct distance to the target but in a direction opposite to its true location, as compared with when they walked without vision directly to the target. That finding suggests that the subjects were nonvisually updating their positions not with respect to an abstract representation of the target's distance but with respect to a representation of its relative location within the task environment.     

Reversing the phonological similarity effect

The phonological similarity effect--poor retention of order for lists of similar-sounding items--is a benchmark finding in the short-term memory literature. In our first two experiments, we show that the effect actually reverses following relatively brief periods of distraction, yielding better order retention for similar than for dissimilar lists, provided that different items are used on every trial. In Experiment 3, the same items were used on every trial and similar lists produced poorer performance across all three retention intervals. The results are interpreted from a general discrimination framework: Items are viewed as occupying positions in a multidimensional space defined by list and within-list dimensions.     

The Dimensionality of Memory Strength Between Levels of Both Serial Position and Word Frequency Category

In recognition tasks where Signal Detection Theory (SDT) is applied, a suitable decision variable is required. This variable is typically assumed to be a global assessment of memory strength. A further assumption is that factors such as old-new, serial position (SP), and word frequency (WF) simply act to change the value of strength across levels within the factor. In terms of SDT, the decision variable is assumed to be uni-dimensional. Four experiments are reported that provide a direct empirical assessment of this assumption for SP and WF. Judgements of items (JOI), recency (JOR), and primacy (JOP) were measured for SP; and subjective frequency (JOF) was measured for WF. Multiple dimensions imply non-additive effects across factor levels and different retrieval processes or the influence of an extra process. A single dimension is consistent with an additive effect of factor levels and current theorizing. The data are in fairly good agreement with the uni-dimensional assumption across all four factors with the exception of JOR and JOP. These showed less uni-dimensionality for comparisons between beginning vs. end list items. The implications of this are discussed.     

The Sigmund Freud Museum Exhibit: The Price for a Bit of Good Luck

The Museum Exhibit on the life and works of Sigmund Freud and psychoanalysis opened at the Library of Congress in Washington, DC on October 15, 1998. The Exhibit includes both praise and critical commentary regarding Freud's many contributions. Original documents, artifacts and personal items from Freud collections are on display as well as film clips, photographs, and other recordings. Different periods in Freud's life are highlighted. After leaving Washington, DC, the Exhibit will travel to New York, Los Angeles, and on to Vienna.     

Book reviews

Classical Probability in the Enlightenment. LORRAINE DASTON, 1988. Princeton, Princeton University Press. xviii + 423 pp., US$19.95 (paperback). ISBN 0–691–08497–1, 0–691–00644‐X (paperback)

Following Form and Function: a Philosophical Archaeology of Life Science. STEPHEN T. ASMA, 1996. Evanston, IL, Northwestern University Press. xiii + 232 pp., price not available

Concepts and Methods in Evolutionary Biology. ROBERT N. BRANDON, 1996. Cambridge, Cambridge University Press. xiv+221 pp., $US59.95 (hardback), $Can 27.50 (paperback). ISBN 0–521–49545–9 (hardback), 0–521–49888–0 (paperback)

The Completeness of Scientific Theories: on the Derivation of Empirical Indicators within a Theoretical Framework: the Case of Physical Geometry. The University of Western Ontario Series in Philosophy of Science, Volume 53. MARTIN CARRIER, 1994. Dordrecht, Kluwer. xviii + 248 pp., price not available. ISBN 0–7923–24757 (hardback)

The Philosophy and History of Molecular Biology: New Perspectives. Boston Studies in the Philosophy of Science, Volume 183. SAHOTRA SARKAR (Ed.), 1996. Dordrecht, Kluwer. 264 pp., $US127. ISBN 0–7923–3947–9

Awareness: What it is, What it does. CHRIS NUNN, 1996. London and New York, Routledge. price not available. ISBN 0–415–13227–4     

Rape Myths and Hookup Culture: An Exploratory Study of U.S. College Students' Perceptions

The present study provides the first known systematic examination of the association of hookup culture endorsement and rape myth acceptance. Multivariate regression analysis was conducted to test the primary hypothesis that hookup culture endorsement would be the primary predictor of rape myth acceptance levels among a sample of 422 U.S. college students. Findings indicated the existence of a complex relationship in which rape myth acceptance increases or decreases based upon the form of hookup culture endorsement examined. Beliefs that hookups are harmless and elevate social status increased rape myth acceptance, whereas beliefs that hookups express sexual freedom decreased rape myth acceptance. Furthermore, results supported the hypothesis that hookup culture endorsement was the largest predictor of rape myth acceptance. Consistent with previous studies, the predictive power of gender and religiosity in determining levels of rape myth acceptance were shown to be significant. When controlling for levels of hookup culture endorsement, the explanatory power of these variables decreased, and hookup culture endorsement had the largest effect upon rape myth acceptance levels.     

Translating the ICAP Theory of Cognitive Engagement Into Practice

ICAP is a theory of active learning that differentiates students’ engagement based on their behaviors. ICAP postulates that I nteractive engagement, demonstrated by co‐generative collaborative behaviors, is superior for learning to C onstructive engagement, indicated by generative behaviors. Both kinds of engagement exceed the benefits of A ctive or P assive engagement, marked by manipulative and attentive behaviors, respectively. This paper discusses a 5‐year project that attempted to translate ICAP into a theory of instruction using five successive measures: (a) teachers’ understanding of ICAP after completing an online module, (b) their success at designing lesson plans using different ICAP modes, (c) fidelity of teachers’ classroom implementation, (d) modes of students’ enacted behaviors, and (e) students’ learning outcomes. Although teachers had minimal success in designing Constructive and Interactive activities, students nevertheless learned significantly more in the context of Constructive than Active activities. We discuss reasons for teachers’ overall difficulty in designing and eliciting Interactive engagement.     

Human–Computer Interaction in Face Matching

Automatic facial recognition is becoming increasingly ubiquitous in security contexts such as passport control. Currently, Automated Border Crossing (ABC) systems in the United Kingdom (UK) and the European Union (EU) require supervision from a human operator who validates correct identity judgments and overrules incorrect decisions. As the accuracy of this human–computer interaction remains unknown, this research investigated how human validation is impacted by a priori face‐matching decisions such as those made by automated face recognition software. Observers matched pairs of faces that were already labeled onscreen as depicting the same identity or two different identities. The majority of these labels provided information that was consistent with the stimuli presented, but some were also inconsistent or provided “unresolved” information. Across three experiments, accuracy consistently deteriorated on trials that were inconsistently labeled, indicating that observers’ face‐matching decisions are biased by external information such as that provided by ABCs.     

Age-related differences in interhemispheric visuomotor integration measured by the redundant target effect

Presentation of bilateral redundant visual stimuli produces faster reaction times (RT) than presentation of a single unilateral stimulus; an effect known as the redundant target effect (RTE; Miller, 1982), and is a means of testing interhemispheric visuomotor integration (Ouimet, 2009). RTEs that exceed expectations, based on Miller's race model of inequality (RMI), are referred to as "enhanced RTEs" and imply neural coactivation. Paradoxically, enhanced RTEs are observed in cases of corpus callosum disruption. The Hemispheric Coactivation Hypothesis accounts for this paradox by positing that bihemispheric processing occurs to both unilateral and bilateral stimuli in the normal brain, but occurs only with bilateral stimuli in the disconnected brain. Neuroimaging has revealed decreases in the microstructural integrity of the corpus callosum with age (Ota et al., 2006), but research investigating the bilateral RTE in healthy older individuals is lacking. The present study investigated the bilateral RTE in healthy younger and healthy older adults using simple RT and choice RT tasks. Our prediction that older individuals would show significantly larger RTEs than younger individuals was found to be true for both tasks. Tests of the RMI produced little evidence for coactivation. The crossed-uncrossed difference, generally used as a means of testing visuomotor interhemispheric transfer, was also investigated, but no age effects were found. The observation of greater RTE in age is congruent with the Hemispheric Coactivation hypothesis (Miller, 2004) in which callosal disconnection is associated with increased RTE.