Motor and visual codes interact to facilitate visuospatial memory performance

The spatial working memory system constantly updates spatial representations and many studies have focused on the underlying principles of the encoding and maintenance of visual information. Here we investigated the question of how the production of actions influences spatial working memory. Participants were given a task that required concurrent maintenance of two spatial arrays, one encoded by visual observation accompanied with pointing movements, the other by only visual observation. Across two experiments, movement during encoding was found to facilitate recognition of spatial arrays in a load-dependent manner. The results suggest an action-based encoding principle within the working memory system, and possible underlying action-related mechanisms are discussed.     

Animalism versus Lockeanism: Reply to Mackie

I respond to criticisms by David Mackie in PQ , 49 (1999), pp. 369–76, of my previous paper on animalism and Lockeanism. I argue that the 'transplant intuition', that a person goes where his brain (or cerebrum) goes, is compatible both with animalism and Lockeanism. I give three arguments for this conclusion, two of them developing lines of thought in Parfit's work. However, I accept that animalism and Lockeanism are incompatible, and I go on to consider the difficulties for Lockeanism that this raises. The principal difficulty, concerning the reference of 'I', can be met by distinguishing the thinker of an 'I'-thought from the reference of an 'I'-thought. The reference is always the person thinking the thought, but when the thought is simultaneously that of an animal coincident but non-identical with that person, there is not a unique thinker. Mackie's criticisms of this view are ineffective.     

Lookup tables for linear trajectories through color space

Many applications require changing the color of a visual stimulus, so that a linear trajectory through color space is traversed. The present paper outlines two methods for generating such trajectories on computer-controlled video systems. FORTRAN implementations of each method are provided, along with measures of interest for studies of color vision.     

Why you don't have a “perfect right” to anything

This paper demonstrates why the kind of rights usually presumed in assertive training most probably do not exist and why acting as if such rights do exist proves problematic. It contrasts these improbable rights with legal rights which do exist for some people in some societies. It concludes by suggesting an alternative scheme, The Picnic Mentality, for dealing with problems others have attempted to address using the concept of rights.Hank Robb is Executive Director for the Pacific Institute for RET and Training Coordinator for the Counseling Psychology Program, Lewis & Clark College, Portland, Oregon.I wish to thank four anonymous reviewers for their comments on earlier versions of this article.     

The ethical judgment of animal research

One hundred sixty subjects acted as members of a hypothetical Institutional Animal Care and Use Committee and evaluated five proposals in which animals were to be used for research or educational purposes. They were asked to approve or reject the proposals and to indicate what factors were important in reaching their ethical decisions. Gender and differences in personal moral philosophy were related to approval decisions. The reasons given for the decisions fell into three main categories: metacognitive statements, factors related to the animal, and factors related to the design of the experiment.     

Improvement in line orientation discrimination is retinally local but dependent on cognitive set

The ability of human observers to discriminate the orientation of a pair of straight lines differing by 3° improved with practice. The improvement did not transfer across hemifield or across quadrants within the same hemifield. The practice effect occurred whether or not observers were given feedback. However, orientation discrimination did not improve when observers attended to brightness rather than orientation of the lines. This suggests that cognitive set affects tuning in retinally local orientation channels (perhaps by guiding some form of unsupervised learning mechanism) and that retinotopic feature extraction may not be wholly preattentive.     

Parafraud in biology

The concept of parafraud is described as “illogical or improper behaviour towards other peoples’ views or publications,” and 19 different kinds of common practices coming under this heading are listed. Ways of combating it are suggested. Dr. Hillman was the Reader in Physiology at the University of Surrey from 1968 to 1995 and Director of the Unity Laboratory of Applied Neurobiology from 1970 to date.