Versuche zur multidimensionalen Skalierung von subjektiven Reizähnlichkeiten auf Grund von Schätzurteilen,Entscheidungszeiten und Verwechslungshäufigkeiten beim Wiedererkennen

Zusammenfassung Es wird über drei Experimente berichtet, in denen auf verschiedene Art und Weise subjektive Ähnlichkeitsbeziehungen zwischen Reizen ermittelt worden sind. Während im Versuch I Distanzen zwischen den Objekten auf Grund direkter Ähnlichkeitsschätzungen gewonnen wurden, sind im Experiment II die Ähnlichkeitsbeziehungen aus Entscheidungszeiten definiert worden, die von der Darbietung der Reizpaare bis zur Urteilsabgabe benötigt worden sind. Im Versuch III ist schließlich die Anzahl der Verwechslungen beim Wiedererkennen als quantitativer Ausdruck für die Ähnlichkeit verwandt worden.Mit Methoden der multidimensionalen Skalierung sind die aus den Ähnlichkeitsmatrizen analysierbaren Ordnungsgesichtspunkte ermittelt worden. Ihre psychologische Deutung ist durch Benennung der Skalen und durch Versuche zur Rekonstruktion der Urteils- bzw. Wiedererkennungsprozesse versucht worden. In den ersten beiden Versuchen konnten je drei interpretierbare Dimensionen ermittelt werden. Experiment III erbrachte einen weiteren vierten Faktor. Beim Vergleich der drei Ähnlichkeitsstrukturen konnten für jeweils zwei Skalen inhaltliche Übereinstimmungen erkannt werden. Dabei zeigten die auf Entscheidungszeiten zurückgehenden Dimensionen den jeweils geringsten Differenzierungsgrad mit nur wenigen Unterscheidungsklassen. Die verbleibenden Faktoren konnten weitgehend auf spezielle Bedingungen des jeweiligen Versuches zurückgeführt werden.

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Experiments in multidimensional scaling of subjective stimulus similarities based on ratings, descion times, and confusions in recognition

Summary This is a paper showing in different ways subjective relations of similarity between stimuli. While in experiment No. I distances between objects have been won due to direct ratings of similarity, the relations of similarity in experiment No. II have been defined from the time of presentation of the pairs of stimuli until the stating of judgement. In experiment No. III, finally, the number of mistakes in recognition were used as a quantitative expression of similarity.The analyzable aspects of classification, which were used by the Ss, have been won by means of procedures of multidimensional scaling. A psychological interpretation has been tried by denominating the scales and by tyring to reconstruct the processes of judgement respectively recognition. In each of the first two experiments three interpretable dimensions were found. Experiment No.III showed a further fourth factor. When comparing the three structures of similarity, agreement in content could be found out for the first two scales as well as for the second ones. The dimensions going back to the decision times showed the least rate of differentiation with only few classes of discrimination. The remaining factors could be attributed mostly to the special conditions of each of the experiments.

     

Acquisition of matching-to-sample performance in rats using visual stimuli on nose keys.

Steady and blinking white lights were projected on three nose keys arranged horizontally on one wall. The procedure was a conditional discrimination with a sample stimulus presented on the middle key and comparison stimuli on the side keys. Three rats acquired simultaneous "identity matching." Accuracy reached 80% in about 25 sessions and 90% or higher after about 50 sessions. Acquisition progressed through several stages of repeated errors, alteration between comparison keys from trial to trial, preference of specific keys or stimuli, and a gradual lengthening of strings of consecutive trials with correct responses. An analysis of the acquisition curves for individual trial configurations indicated that the matching-to-sample performance possibly consisted of separate discriminations.     

Linking personality states,current social roles and major life goals

Employing an experience‐sampling design, the interplay between personality states, social roles and major life goals was examined as it unfolds in the stream of people's daily lives. Multilevel analyses revealed a considerable amount of both within‐ and between‐person variability in state expressions of personality traits justifying further examination of predictors at both levels of analyses. Roles proved as predictors of current personality states albeit effects differed significantly between individuals. Life goals accounted for between‐person differences in average personality states but were not effective in predicting differences in relations between personality states and roles. Altogether, findings testify to the viability of the employed research strategy to analyse the interplay between both dispositional and fluctuating influences on individuals' trait expressions in behaviour. Copyright © 2009 John Wiley & Sons, Ltd.     

Cognitive mediation of intervention effects on physical exercise: Causal models for the adoption and maintenance stage

Objective: To investigate how the effects of a group-based intervention program (MoVo-LISA) on exercise behaviour were mediated by cognitive variables. Different causal models mapping the short-term (adoption) and long-term (maintenance) intervention effects were tested using path analyses.

Design: N?=?220 in-patients of a rehabilitation clinic were assigned to an usual care or intervention group (quasi-experimental design). Questionnaire-based assessment was conducted at baseline; discharge; and at six weeks, six months and 12 months post discharge.

Measures: The potential mediator variables were outcome expectations, self-efficacy, strength of goal intention (intention strength), self-concordance, action planning and barrier management.

Results: Observed intervention effects on exercise behaviour (p?<?0.05) were mediated by intention strength at the adoption and maintenance stages, by action planning only at the adoption, and by barrier management only at the maintenance stage. Self-efficacy and outcome expectations were only indirectly involved in these mediations by affecting intention strength and self-concordance.

Conclusion: This is the first study to track the cognitive mediation processes of intervention effects on exercise behaviour over a long time-period by differentiating the adoption and maintenance stages of behaviour change. The findings emphasise the importance of deconstructing intervention effects (modifiability vs. predictive power of a mediator) to develop more effective interventions.     

Genetic and environmental influences on personality profile stability: unraveling the normativeness problem

The present study is the first to disentangle the genetic and environmental influences on personality profile stability. Spanning a period of 10 years, we analyzed the etiology of 3 aspects of profile stability (overall profile stability, distinctive profile stability, and profile normativeness) using self- and peer reports from 539 identical and 280 fraternal twins reared together. This 3-wave multirater twin design allowed us to estimate the genetic and environmental effects on latent true scores of the 3 aspects of profile stability while controlling for method effects and random error. Consistent biometric results were only found for profile normativeness, whereas overall and distinctive profile stability scores turned out to be biased. Over time, we found personality profile normativeness to be relatively stable. This stability was due to both stable genetic and nonshared environmental effects, whereas innovative variance was completely explained by nonshared environmental effects. Our findings emphasize the importance of distinguishing between the different aspects of profile stability, since overall and distinctive stability scores are likely biased due to the normativeness problem. Yet indicating a person's similarity to the average person, the normativeness of a personality profile itself has a psychological meaning beyond socially desirable responding.     

Operant conditioning of autogrooming in vervet monkeys: Cercopithecus aethiops

Vervet monkeys received food reinforcement contingent on autogrooming. Experiment 1 reinforced grooming on a schedule of increasing intermittency and grooming increased in frequency and duration; with only pauses reinforced, grooming decreased in frequency and duration. Experiment 2 demonstrated differentiation of operant autogrooming; in each session a different single form of grooming was reinforced (for example, grooming the tail only), and that form increased in frequency while other forms became less frequent. In Experiment 3 scratching was succesfully conditioned with a method that selectively reinforced variety in behavior; reinforcement was contingent on a shift in scratching form. In Experiment 4, with no contingencies on grooming, a prefood stimulus did not increase autogrooming whether or not grooming had previously resulted in contingent reinforcement. The form of conditioned autogrooming resembled the form of unconditioned autogrooming. The discussion suggests how reinforcement principles can account for changes in the topography of operant behavior.     

A computer-automated laboratory for studying complex perception-action skills

In this paper, we describe a computer-based laboratory for collecting and analyzing real-time performance and eye-movement data by using video game-like tasks. These tasks assess skills that require the integration of varying numbers of perception and action components. Customized hardware and software are described for configuring tasks, collecting data, reconstructing performance, and organizing, editing, and reducing data. General design considerations are emphasized for solving several of the problems encountered in constructing a real-time data collection system. The paper concludes with examples of data that illustrate the system’s usefulness for studying complex perception-action skills.