SynopsisControls (N = 45), schizophrenics (N = 20) and alcoholics (N =23) were asked to choose at random a number between 1 and 10, 100 times. The correlation matrices of five different randomization indices were used to study within group variation; these matrices were similar for the normal and alcoholic groups, but very different for the schizophrenic group. The differences between the three groups were studied by canonical analysis and, in terms of the canonical variables, the mean performance of the normal group is clearly discriminated from that of the alcoholic and schizophrenic subjects.
PROLOG (PROgramming in LOGic) is the declarative programming language at the heart of the Japanese fifth-generation computer project. It is proposed that PROLOG is a suitable tool for symbolic image processing, once standard preprocessing has been done. In the present application, the problem of prediction of coronary anatomy from myocardial scintigrams is addressed. Uncertainty is dealt with by a combination of fuzzy-set theoretic and probabilistic reasoning. Heuristic classification rules are based on clinical experience and on a set of 247 myocardial scintigrams with their corresponding coronary angiograms.
The Logic Programming language, Prolog, is used to schedule the medical duty roster for a French psychiatric hospital. Each of the seventeen doctors participating is asked to fill in a form indicating his preferences (prefers, can or cannot) for the slots (days and weekends) of a roster covering a period of three months. An algorithm has been designed which seems to produce an optimal solution, in the sense that as many participants as possible are satisfied. First of all, the program fills in the 'preferred' slots, then the 'possible' slots and finally the 'not-impossible' slots. A number of constraints are applied: two consecutive roster slots are not allowed and the number of allocations is limited for each person. If more than one person is a candidate for a given slot at a given preference level, then a probabilistic conflict resolution procedure is put into action. Prolog, which is modular and easily modifiable, seems, with its declarative interpretation and backtracking mechanism, to be well adapted to the solution of such problems.
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