Form discrimination: features or invariants?

Does form discrimination rely on feature analysis, as the indirect theory of perception supposes, or on affordances (behavioural meanings specified by invariant patterns), as direct theory states. Subjects were to indicate the position of a target in a perspective rendering of a plane, displayed for 100 msec. in a large screen projection. In one of the conditions the target disrupted the plane, in the other it did not. Although targets of the two conditions shared the same features, the disruptive targets were discriminated more often than the nondisruptive targets. This result supports the direct approach to perception which states that a perceiver discriminates behaviourally relevant patterns rather than geometrical properties.     

Some properties of two measures of multivariate association

Two kinds of measures of multivariate association, based on Wilks' and the Bartlett-Nanda-Pillai trace criterionV, respectively, are compared in terms of properties of the univariateR ² which they generalize. A unified set of derivations of the properties is provided which are self-contained and not restricted to decompositions in canonical variates. One conclusion is that asymmetric index based on allows generalization of the multiplicative decomposition ofR ² in terms of squared partial correlations, but not the additive decomposition in terms of squared semipartial correlations, while the reverse is true for anasymmetric index based onV.We are indebted to Jos M. F. ten Berge for some fruitful discussions.     

Biofeedback without a technical team--simple and cost effective

An important psychotherapeutic process is that of autogenous training, whose effectiveness can be improved by the use of biofeedback. Biofeedback procedures have hitherto called for considerable expenditure on apparatus and frequent therapy sessions. Despite this, it has not been possible to extend the relaxation effect to more general situations. This paper describes an inexpensive and practical method of utilising all the advantages afforded by the underlying therapeutic concept, on the basis of experience gained with cutaneous thermography. Further information, notably on the preparation of the laminae, can be had on request from the authors.     

The causality principle of psychotherapy and supportive methods in group psychotherapy--reflections on the principles of method combinations

A causality principle of psychotherapy is offered, starting from a technologically orientated concept of psychotherapy as a process. Working from target, commencement, principles, and means, psychotherapeutic methods may be characterised. From these, rules governing the therapist's mode of conduct are arrived at. The causality principle provides a theoretic and practical basis for the integration of ancillary methods into various therapeutic concepts, and for therapeutic teamwork.     

Thoughts on the 7th world congress of the IPPNW (International Physicians for Prevention of Nuclear War) in Moscow

The authors discuss the international campaign of doctors in opposition to nuclear warfare, "the ultimate scourge of mankind", and give their impressions of the seventh international IPPNW congress held in Moscow from May 29 to June 1, 1987.     

Computer-assisted implementation of the MMPI test

In a research programme lasting one year a computer-supported technique for the MMPI-Test has been developed in co-operation of the Clinical-Psychology and the Bio-Medical. Engineering Departments. The use of the microelectronically operated test apparatus has proved extremely economic.     

Loss of smell and taste within the scope of vitamin B 12 deficiency

The article deals with the case of a patient who had a partial gastrectomy and developed a vitamin B12 deficiency syndrome with anemia, myelopathy and complete loss of the senses of taste and smell. Regression of the symptoms followed liberal dosing with vitamin B12.