A Closer Look at the Yardstick: A New Discount Rate Measure with Precision and Range

In intertemporal choice research, choice tasks (i.e., choosing between $80 today and $100 in a year) are often used to elicit a discount rate. The discount rate derived from a choice task, however, is largely restricted by the granularities and ranges of the questions asked. We examined this restriction in three popular discount rate measurements using simulations and experiments, and we propose an alternative procedure (Three‐option Adaptive Discount rate measure (ToAD)), which is capable of measuring a wide range of discount rates (from approximately .035% to 350 000% annual percentage rate) with high precision using 10 questions, in under a minute. ToAD can be easily implemented in online surveys (i.e., Qualtrics). Copyright © 2015 John Wiley & Sons, Ltd.     

Social enhancement of laughter: an experimental analysis of some companion variables.

Three experiments, investigate companion influences on humorous laughter and smiling. Boys and girls, aged 7 to 9 years, were played humorous recordings through headphones in dyadic and solitary conditions. Experiment I demonstrates that social facilitation effects in laughter and smiling reported in Chapman (1973) generalize to cases where a 2-year age/status difference exists between naturalistic coactors. In Experiments II and III companions were confederates, 2 years senior to subjects. They responded to directions relayed through headphones (coaction conditions) or a concealed speaker (audience conditions). It is shown in Experiment II that subjects' laughter, smiling, and looking are facilitated by increases in the laughter and smiling of coactors and, in Experiment III, that audiences are less effective in promoting high levels of responses. While increments in the coactor's looking enhance smiling and looking, corresponding increases in laughter are not statistically significant. Humor-ratings are associated with behavioral responses in Experiment II, but not Experiment III. Interaction data and results from subsidiary conditions are discussed.     

Dimensional separability or flexibility of attention? Age trends in perceiving configural stimuli

The hypothesis that perceptual development proceeds from less to greater dimensional separability was tested by giving a speeded classification task to first and fouth graders. In Experiment 1, children sorted line drawings of a cartoon figure into two piles according to his eyes (open or closed) or his mouth (smiling or frowning). First graders exhibited the pattern characteristic of integral dimensions: An interference effect was found when dimensions were combined orthogonally and a facilitation effect when dimensions were correlated, relative to a condition in which only one dimension varied. Fourth graders exhibited an optional separable pattern: There was facilitation in the correlated condition but no interference in the orthogonal condition. These results support the hypothesis that development proceeds toward greater flexibility of attention rather than simply toward increasing separability. A flexible field hypothesis of visual attention was suggested to explain how older children can exercise such optional separability. This hypothesis correctly predicted the asymmetrical relation between dimensions found in Experiments 2 and 3: For both first and fourth graders, the eyes of a cartoon figure (open or closed) and his location (right or left) were nonseparable when the eyes were relevant and separable (or optional separable) when location was relevant.     

Social facilitation of laughter in children

This experiment was designed primarily to show that laughter can be socially facilitated. Independent groups of 7-yr-old children listened on headphones to amusing material under three conditions: they were tested in isolation (alone condition), with a nonlistening companion (audience condition), or with another who also listened to the material (coaction condition). Pairs of children were of like sex. The companions from the audience condition listened on a later occasion. Total times spent laughing and smiling were highest in the coaction condition, and were higher in the audience condition than in the alone condition. The data provide some support for Zajonc's “mere presence” hypothesis. They are also discussed in relation to: (1) informational aspects of laughter; (2) the relationship between overt expressive responses and subjective ratings of funniness; (3) an operational definition of “mirth”; (4) sex differences in laughter and smiling.     

Eliciting children’s and adults’ accounts of road accidents

Psychological knowledge from eye-witness research is applied here to the particular problem of reporting road accidents. Thereby the paper highlights some of the assumptions in eye-witness research. The interface between that research and the reporting of road accidents is examined by reference to existing social psychological notions. These are notions about questioning and about hypothesis testing. The paper makes special reference to the questioning of child witnesses because problems therein are particularly acute.     

The impact of socially projected group composition on behavior in a commons dilemma: A self-attention perspective

Socially projected group compositions, based on subjects’ expectancies about the behavior of others and the number of subjects taking part on the resource use task, were indexed using Mullen’s Additive Other-Total Ratio (Mullen, 1987) and used to predict harvesting behavior in a commons dilemma. One-hundred forty-three males took part in a resource use task in groups ranging in size from two to six members. Just prior to harvesting trials, subjects indicated the number of those taking part that they expected to overharvest and to underharvest, and indicated to which of these groups they had assigned themselves. Results indicated that harvesting behavior varied as a function of the number of others expected to behave differently from self, and conformed to patterns predicted by Self-Attention Theory. With increases in the number of others expected to underharvest, indexing an increase in self-attention, subjects who indicated they would overharvest become more conservative in resource use. However, subjects who indicated they would underharvest did not significantly decrease harvest size with increases in the number of others expected to overharvest. These subjects were already harvesting at an optimal or sub-optimal rate, and therefore had no need to reduce the size of their harvests to match their behavior to standards stressing conservatism in resource use.     

Brain responses related to semantic meaning

Evoked Potentials from electroencephalogram (EEG) recording were averaged to many visually presented word stimuli whose semantic meanings were specified along Osgood's semantic dimensions of Evaluation, Potency, and Activity [Miron &; Osgood, 1966, in R. B. Cattell (Ed.), Handbook of multivariate experimental psychology, Chicago: Rand-McNally; Osgood, 1971, Journal of Social Issues, 27, 5–63; Osgood, May, &; Miron, 1975, Cross-cultural universals of affective meaning, Urbana, Ill.: University of Illinois Press]. Multivariate analyses classified the Evoked Potentials to six semantic classes with success rates more than twice chance expectation. The pattern of brain activity related to the six semantic classes was similar for (i) two sets of words, (ii) 10 subjects used to develop the analyses, and (iii) an added, new subject.     

EP Component Identification and Measurement by Principal Components-Analysis

Between the acquisition of Evoked Potential (EP) data and their interpretation lies a major problem: What to measure? An approach to this kind of problem is outlined here in terms of Principal Components Analysis (PCA). An important second theme is that experimental manipulation is important to functional interpretation. It would be desirable to have a system of EP measurement with the following characteristics: (1) represent the data in a concise, parsimonous way; (2) determine EP components from the data without assuming in advance any particular waveforms for the components; (3) extract components which are independent of each other; (4) measure the amounts (contributions) of various components in observed EPs; (5) use measures that have greater reliability than measures at any single time point or peak; and (6) identify and measure conponents that overlap in time. PCA has these desirable characteristics. Simulations are illustrated. PCA′s beauty also has some warts that are discussed. In addition to discussing the usual two-mode model of PCA, an extension of PCA to a three-mode model is described that provides separate parameters for (1) waveforms over time, (2) coefficients for spatial distribution, and (3) scores telling the amount of each component in each EP. PCA is compared with more traditional approaches. Some biophysical considerations are briefly discussed. Choices to be made in applying PCA are considered. Other issues include misallocation of variance, overlapping components, validation, and latency changes.