Survey on Using Ethical Principles in Environmental Field Research with Place-Based Communities

Science and Engineering Ethics - Researchers of the Northeast Ethics Education Partnership (NEEP) at Brown University sought to improve an understanding of the ethical challenges of field...     

A zero-bounded model of operant demand

Contemporary approaches for evaluating the demand for reinforcers use either the Exponential or the Exponentiated model of operant demand, both derived from the framework of Hursh and Silberberg (2008). This report summarizes the strengths and complications of this framework and proposes a novel implementation. This novel implementation incorporates earlier strengths and resolves existing shortcomings that are due to the use of a logarithmic scale for consumption. The Inverse Hyperbolic Sine (IHS) transformation is reviewed and evaluated as a replacement for the logarithmic scale in models of operant demand. Modeling consumption in the “log₁₀-like” IHS scale reflects relative changes in consumption (as with a log scale) and accommodates a true zero bound (i.e., zero consumption values). The presence of a zero bound obviates the need for a separate span parameter (i.e., k) and the span of the model may be more simply defined by maximum demand at zero price (i.e., Q₀). Further, this reformulated model serves to decouple the exponential rate constant (i.e., α) from variations in span, thus normalizing the rate constant to the span of consumption in IHS units and permitting comparisons when spans vary. This model, called the Zero-bounded Exponential (ZBE), is evaluated using simulated and real-world data. The direct reinstatement ZBE model showed strong correspondence with empirical indicators of demand and with a normalization of α (ZBEn) across empirical data that varied in reinforcing efficacy (dose, time to onset of peak effects). Future directions in demand curve analysis are discussed with recommendations for additional replication and exploration of scales beyond the logarithm when accommodating zero consumption data.     

Stout,Rawls, and the Idea of Public Reason

Jeffrey Stout claims that John Rawls's idea of public reason (IPR) has contributed to a Christian backlash against liberalism. This essay argues that those whom Stout calls “antiliberal traditionalists” have misunderstood Rawls in important ways, and goes on to consider Stout's own critiques of the IPR. While Rawls's idea is often interpreted as a blanket prohibition on religious reasoning outside church and home, the essay will show that the very viability of the IPR depends upon a rich culture of deliberation in which all forms of reasoning can be put forth for consideration. This clarification addresses the perception that the IPR imposes an “asymmetrical burden” upon believers. In fact, the essay suggests that there are good reasons why believers, qua believers, might endorse the IPR.     

Enhanced Latent Inhibition Following Compound Pre-exposure

The influence of non-reinforced exposure to compound stimuli on subsequent appetitive classical conditioning was examined in five experiments with rats as the subjects. Non-reinforced exposure to a visual stimulus retarded subsequent acquisition of conditioned responding relative to a non-pre-exposed condition (latent inhibition). If the target stimulus was pre-exposed in compound with a second (non-target) stimulus, then latent inhibition was abolished. Exposure to the non-target stimulus prior to compound exposure had varying effects on subsequent conditioning to the target: 40 exposures to the non-target stimulus resulted in latent inhibition to the target stimulus that was comparable in magnitude to that observed when the target stimulus was exposed in isolation; 120 exposures to the non-target stimulus enhanced latent inhibition to the target stimulus.     

Book reviews

Hall, G. (1991). Perceptual and associative leaning. Oxfod: Clarendon Press. Pp. xi + 300. ISBN 0-19-8524182-0. £35.00.

Rahmann, H., & Rahmann, M. (1992). The neurobilogical basis of memoy and behavior. New York: Springe Verlag. Pp. 292. ISBN 3-540-97545-4. £53.00.

Iversen, I.H., & Lattal, K.A. (Eds.). (1991). Experimental analysis of behavior, arts 1 and 2. Techniques in the behavioral and neural sciences, volume 6 (series editor: J.P Huston). Amstedam: Elsevier. Pp. 724. ISBN 0-444-8932-2. £50.00 (paperback).

Baudry, M., & Davis, J.L. (Eds.) (1991). Long-tem potentiation: A debate of current issues. Cambridge, Ma & London, England: MIT Press. Pp. xxii + 454. ISBN 0-262-02330-x. £62.95 (Hb).

The Biological Council Animal Reseach and Welfare Panel (1992). Guidelines on the handling and training of laboatory animals. Univer-sities Federation for Animal Welfare. Pp. ISBN 0-900767-77-4. £2.50.