Retention of visually presented information in children’s spelling

Memory & Cognition - One hundred and thirty-six 8-year-old children participated in two studies of their ability to spell familiar or nonsense words which they had seen or heard for 2–5...     

Changes in absolute detection threshold and in subjective intensity of suprathreshold stimuli during olfactory adaptation and recovery

Olfactory adaptation and recovery to methyl isobutyl ketone at a concentration 10 times the absolute detection threshold (I_{t o}) was intensively studied in two human Ss. A combined psychophysical procedure was used that allowed comparisons of changes in threshold (I_t) with changes in the subjective intensity of suprathreshold stimuli. Information was also obtained on the effect of the adapting stimulus on the psychophysical power function for this odorant. A threshold detection procedure was used to estimate changes in I_t; an unstructured magnitude-estimation procedure was used to monitor changes in the subjective intensity of suprathreshold stimuli and the psychophysical power function. The data provided additional information on the behavioral course of olfactory adaptation and recovery and suggested that this combined method can be used profitably for further investigations of this kind. Complementary to the work of Cain and Engen (1969), the results suggested an increase in the exponent of the power function with increasing adaptation.     

Olfactory adaptation and recovery in man as measured by two psychophysical techniques

Olfactory adaptation and recovery was investigated in man, using two psychophysical procedures: modified category scaling and threshold detection. Both procedures yielded similar qualitative information regarding loss and recovery of olfactory sensitivity as a function of time and concentration of adapting stimuli. However, quantitative differences were observed that could be partially attributed to artifacts inherent in each procedure. Often more than 50% adaptation (and recovery) occurred within the first 2 min with either test procedure. In all experiments the rate of adaptation and recovery was greater at the higher of two adapting concentrations (10 × and 20 × the detection threshold I_t). Recovery occurred more rapidly than adaptation. The usefulness of both techniques is discussed in terms of the overall problem of characterizing the olfactory adaptation and recovery process in man.     

汉语语词的短时记忆广度

我们应用标准的立即回忆实验设计,考查汉语语词的短时记忆(STM)广度。以单音词,双音合成词和四字成语为材料的STM广度,基本上符合STM的组块假说(即STM能贮存一个固定数目的组块),但受到组块熟悉性和复杂性的较大影响。而且,语音的相似性引起广度的降低。汉字在字形上的相似性对广度没有什么影响。通过编制人工“汉字”,发现汉字的偏旁部首不是组块单位,而在人工“字”中却作为组块起作用。最后,比较了两种呈现刺激方式对STM广度的影响,发现有控制的知觉策略能增加STM广度。     

The illusory nature of Implicit Personality Theory: Logical and empirical considerations

Mirels (1976) demonstrated that derivations from Implicit Personality Theory were compromised by marked absolute discrepancies between subjects’ estimates of the coendorsement of personality items and the empirical relations between the items. Arguments presented by Jackson, Chan, and Strieker (1979) in a recent critique of this demonstration were shown to be based on an arbitrary and severely restrictive view of implicit theory. Logical and empirical considerations were brought to bear in the present paper to indicate that (a) empirical conditional probabilities of test item coendorsement are an appropriate comparison standard for estimates of those probabilities, (b) large absolute discrepancies between estimated and empirical coendorsement must be regarded as seriously impugning the accuracy of IPT, and (c) exclusive reliance on the correlational correspondence between estimated and empirical coendorsement results in an overly sanguine view of the accuracy of IPT. Moreover, it was shown that subjects fail to discriminate between highly asymmetrical conditional probabilities, a finding directly at variance with the assertion that the presumably veridical postulates of implicit theory are inductively extracted from experience. Also discussed were the relation between IPT and everyday social judgments, and the influence of IPT on behavioral ratings.     

Binary choice reaction time as a criterion of motor equivalence

In a binary choice situation the two alternative movements may vary in the degree in which they are equivalent in respect to controlling processes and/or structures. With a higher degree of motor equivalence a shorter RT is to be expected. A series of five experiments shows that a movement of a finger of one hand has a shorter latency if the alternative movement with the other hand is of the same form than in case of different forms. There is no evidence of corrsponding effect of using the same or different fingers with both hands. These results indicate that programming of the form of a movement is at least partly independent of the muscles involved in movement execution.     

Dimensions of Problem Behavior in institutionalized retardates

A factor analysis of teacher ratings of 55 items of deviant behavior in a sample of 252 institutionalized retardates resulted in the emergence of three interpretable factors. Two factors clearly represented the broad-band dimensions of conduct disorder and anxiety-withdrawal, while the third reflected psychotic behavior. Only conduct disorder was related to age, sex, trace, or intellectual level.