The effect of a masked stimulus on the response to the masking stimulus

Four experiments are reported in which the subjects had to respond to a target that masked a preceding prime via metacontrast masking. In one part of Experiment l, the subjects discriminated the target's shape (square or diamond) by a motor-choice reaction, and in another part they had to respond with a simple reaction. The prime was neutral (circular) with respect to the target's shape. The data showed a facilitation effect. In both tasks the reaction time was reduced by the masked prime. However, the reduction was more pronounced with simple reaction than with choice reaction. In the other experiments, additional primes were used with the same angular shapes as the targets. In Experiments 2 and 3, after discriminating the target's shape by a choice reaction, the subjects had to judge the prime's shape in a signal-detection task. While neither the d' value for discriminating the angular primes from the circular ones (Exp. 2) nor the d' value for distinguishing between the angular primes (Exp. 3) was different from zero, the choice-reaction data showed a congruency effect. With a congruent prime (i.e., a prime that had the same shape as the target), the reaction times were reduced. With an incongruent prime, the reaction times grew. In Experiment 4 the errors were investigated. The facilitation effect was present in the RT, but not in the number of errors, whereas the congruency effect was present in the number, but not in the RT of errors.While the facilitation effect can be attributed either to an unspecific activation by the masked prime or to an influence of the prime on attentional processes, the congruency effect can be explained by the assumption that the masked prime directly activates the specific response, which corresponds to the prime's shape.     

Differential predictive value of parents' and teachers' reports of children's problem behaviors: A longitudinal study

This study investigated the prediction of signs of disturbance in 946 children originally aged 4 to 11 years from the general population across a 6-year period. Parents' and teachers' ratings obtained via the Child Behavior Checklist (CBCL) and Teacher's Report Form (TRF) were tested as predictors of (a) academic problems, (b) school behavior problems, (c) receipt of mental health services, (d) child's need for professional help, (e) suicidal behavior, and (f) police contacts. Total problem scores in the deviant range on the CBCL or TRF were significantly associated with poor outcomes 6 years later. The combination of deviant scores on both the CBCL and TRF was a powerful predictor of poor outcomes with 56% of the girls, and 36% of the boys with total problem scores in the deviant range on both instruments maladjusted 6 years later. The CBCL syndromes Attention Problems and Delinquent Behavior, and the TRF syndromes Delinquent Behavior, Somatic Complaints, and Social Problems significantly predicted poor outcomes. Teachers' reports predicted poor outcomes equally well or even somewhat better than parents' reports. It is important to include teacher information in the diagnostic assessment of children.We wish to thank Dr. Thomas Achenbach for his helpful advice. This research was supported by grants from the Sophia Foundation for Medical Research, and the Health Research Promotion Program.     

Intuition in the context of implicit memory

Summary Most recent work concerned with intuition has demonstrated that people can respond discriminatively to coherence that they cannot identify. Specifically, in a gestalt-closure task subjects were shown slides of paired drawings. One of the drawings represented a fragmented picture of a common object, whereas the other was constructed by rotation of the elements of the coherent gestalt. When the subjects were unable to name the object, they were urged to make a forced-choice decision regarding which of the two drawings represented a real object. The results showed that the proportion of pictures not correctly identified, that were nevertheless correctly selected as coherent, was significantly higher than chance. The current experiment replicated these findings. In addition, it was shown that a study phase with either coherent or incoherent picture primes can bias intuitive judgments in the test phase in accordance with a processing view. Incoherent-picture primes reduced the forced-choice decisions to a level of chance. Moreover, priming was found to be dependent on the similarity between the study and the test stimuli. We argue that a more fluent reprocessing of coherent, or primed, stimuli may be a basis for intuitive judgments. Intuition may go wrong when priming has favored an incoherent solution.     

Expected utility and constrained maximization: Problems of compatibility

In recent attempts at deriving morality from rationality expected utility theory has played a major role. In the most prominent such attempt, Gauthier'sMorals by Agreement, a mode of maximizing utility calledconstrained maximization is defended. I want to show that constrained maximization or any similar proposal cannot be coherently supported by expected utility theory. First, I point to an important implication of that theory. Second, I discuss the question of what the place of constrained maximization in utility theory might be. Third, I argue that no matter how we answer this question, expected utility theory cannot provide the reason why a moral disposition like constrained maximization is to be preferred to its rivals.     

Ueber die Methoden der Physik

Ohne Zusammenfassung     

Stimulus generalization of the effects of punishment

Three pigeons were trained to respond to seven spectral stimulus values ranging from 490 to 610 mμ and displayed in random order on a response key. After response rates had equalized to these values, a brief electric shock was administered when the subject (S) responded to the central value (550 mμ) while positive reinforcement for all values was maintained. Initially, there was broad generalization of the resulting depression in response rate, but the gradients grew steeper in the course of testing. When punishment was discontinued, the rates to all values recovered, and equal responding to all stimuli was reattained by two of the Ss. Stimulus control over the effects of punishment was clearly demonstrated in the form of a generalization gradient; this probably resulted from the combined effects of generalization of the depression associated with punishment and discrimination between the punished value and neutral stimuli.     

Private Announcements on Topological Spaces

In this work, we present a multi-agent logic of knowledge and change of knowledge interpreted on topological structures. Our dynamics are of the so-called semi-private character where a group G of agents is informed of some piece of information \(\varphi \), while all the other agents observe that group G is informed, but are uncertain whether the information provided is \(\varphi \) or \(\lnot \varphi \). This article follows up on our prior work (van Ditmarsch et al. in Proceedings of the 15th TARK. pp 95-102, 2015) where the dynamics were public events. We provide a complete axiomatization of our logic, and give two detailed examples of situations with agents learning information through semi-private announcements.