Commentary on Coefficient Alpha: A Cautionary Tale

The general use of coefficient alpha to assess reliability should be discouraged on a number of grounds. The assumptions underlying coefficient alpha are unlikely to hold in practice, and violation of these assumptions can result in nontrivial negative or positive bias. Structural equation modeling was discussed as an informative process both to assess the assumptions underlying coefficient alpha and to estimate reliability     

Less is better: when low-value options are valued more highly than high-value options

This research demonstrates a less-is-better effect in three contexts: (1) a person giving a $45 scarf as a gift was perceived to be more generous than one giving a $55 coat; (2) an overfilled ice cream serving with 7 oz of ice cream was valued more than an underfilled serving with 8 oz of ice cream; (3) a dinnerware set with 24 intact pieces was judged more favourably than one with 31 intact pieces (including the same 24) plus a few broken ones. This less-is-better effect occurred only when the options were evaluated separately, and reversed itself when the options were juxtaposed. These results are explained in terms of the evaluability hypothesis, which states that separate evaluations of objects are often influenced by attributes which are easy to evaluate rather than by those which are important. © 1998 John Wiley & Sons, Ltd.     

Effects of norms and norm-violations on inhibition and instigation of aggression

It was hypothesized that in a competitive interaction in which an opponent first used threats and fines a) subjects would use the highest level of coercion that could be justified by the available norms, b) subjects would be inhibited by a norm that justified using only low levels of coercion, but c) when the opponent used a magnitude of coercion which exceeded the norm, subjects would also violate the norm and retaliate with an equally high magnitude of coercion, and d) subjects would use the maximum levels of coercion when engaging in a competitive game without norms. These hypotheses were examined in a 3 × 2 factorial experiment in which the amount of coercion allowable by a norm (Low Norm, High Norm, and No Information) and the level of coercion (Low or High) were manipulated. As predicted, aggressive reactions by subjects were inhibited when the provoker conformed to a low norm by using a low level of coercion. On the other hand, subjects retaliated by using a high level of coercion when the level of coercion used by a provoker violated the norm. Subjects who could justify their behavior by the availability of a high punitive norm tended to use all of the coercive power available to them even when the provoker used a low level of coercion. © 1996 Wiley-Liss, Inc.     

汉语及物动词词典中宾语信息的表征

该研究利用认知行为反应时方法,操作汉语及物动词与宾语之间的搭配关系,对汉语及物动词词典中宾语信息的表征情况进行了考察。结果发现,随着动词与宾语搭配的语义违反程度的增大,反应时增加。这表明,汉语及物动词词典中存在比较精确的宾语信息,其宾语信息是以语义特征来表征的。     

Delayed backward conditioning of place preference induced by wheel running in rats

Backward conditioning of place preference has been obtained in hungry rats when wheel running (the rewarding US) is followed immediately by exposure to a distinctive chamber (the CS). We tested whether such backward conditioning would occur with a 10-min delay. In each of four paired exposures, a period of wheel running (2 or 22 h, in separate experiments) was followed by 10 min in the home cage and then 30 min in the CS chamber. Control rats were put in the CS chamber without wheel running. In other similar experiments, a 0-, 10-, or 30-min delay separated wheel running from exposure to the CS chamber. Reliable conditioned place preference (CPP) occurred when the delay was 0 or 10 but not 30 min. The strength of CPP decreased as the delay increased. These findings imply that the reward process initiated by wheel running remains active for some time after running stops. They support the view that the suppression of feeding produced by wheel running in hungry rats (activity anorexia) is mediated by this reward process.     

Creation and the Symbiosis of Science and Judaism

It seems to me that the critical questions that science and natural philosophy raise for Jewish theology are the following: Does God evolve? Does the universe have or even need an interpretation, specifically with reference to the fact that most of the universe most of the time is uninhabitable, and there may be many more than one universe? Does the universe need a beginning? What is distinctive about human consciousness, intelligence, and ethics in the light of evidence for evolution from all of the life sciences? Finally, will both life and the universe end? These questions are not only modern. They contain all the primary issues that have dominated rabbinic thought. That agenda can be summarized in six topics: How should we model what we believe about (1) God, (2) the world, and (3) the human being; and how should we understand the relations between them, that is, between (4) God and the world (or, creation), (5) God and the human (or, revelation), and (6) the human and the world (or, redemption)? In this paper I focus on the fourth issue, creation. My answer is presented in detail in my Judaism and the Doctrine of Creation(Samuelson 1994). Here I shall summarize my conclusions there concerning science, Jewish texts, and the correlation between them.     

Associative learning versus fear habituation as predictors of long-term extinction retention

Violation of unconditioned stimulus (US) expectancy during extinction training may enhance associative learning and result in improved long-term extinction retention compared to within-session habituation. This experiment examines variation in US expectancy (i.e., expectancy violation) as a predictor of long-term extinction retention. It also examines within-session habituation of fear-potentiated startle (electromyography, EMG) and fear of conditioned stimuli (CS) throughout extinction training as predictors of extinction retention. Participants (n?=?63) underwent fear conditioning, extinction and retention and provided continuous ratings of US expectancy and EMG, as well as CS fear ratings before and after each phase. Variation in US expectancy throughout extinction and habituation of EMG and fear was entered into a regression as predictors of retention and reinstatement of levels of expectancy and fear. Greater variation in US expectancy throughout extinction training was significantly predictive of enhanced extinction performance measured at retention test, although not after reinstatement test. Slope of EMG and CS fear during extinction did not predict retention of extinction. Within-session habituation of EMG and self-reported fear is not sufficient for long-term retention of extinction learning, and models emphasizing expectation violation may result in enhanced outcomes.     

Baseline measurement of running away among youth in foster care

The current study evaluated the use of various behavioral measures of running away with regard to (a) the differential utility of interval- versus event-based measures, (b) the differential utility of rate versus duration measures, (c) the utility of correcting for occurrence opportunity, and (d) the influence of unit of analysis (i.e., single-subject vs. grouped data). Seven different baseline measures were calculated for 84 runaways, and a unit-size analysis was conducted by constructing groups of various sizes from the original sample. An expert panel evaluated the suitability of the baseline measures for treatment evaluation. Results demonstrate the utility of evaluating duration-based measures and correcting for occurrence opportunity. Results also indicate that single-subject baselines may often be unacceptable for treatment evaluations, regardless of the type of measure selected for use.     

意义维持模型:理论发展与研究挑战

意义维持模型是近年来兴起的社会心理学理论。它主张将意义维持作为个体最基本的社会动机,认为个体在遭受意义违反后,会激起厌恶性情绪,而缓解厌恶情绪成为意义维持的动力,促使个体采取补偿行为修补意义系统。该理论对认知失调等理论进行了一定程度的整合,并且具有强大而广泛的解释力。研究者对其意义违反、厌恶激起和行为补偿三个基本过程的理论阐述日臻完善,同时其主要观点也得到较多实证研究的支持。在意义维持模型的研究中,也存在意义等概念边界模糊、厌恶激起的中介作用论证不充分、启动和补偿的竞争解释等问题。今后的研究一方面需要进一步检验意义维持的基本过程,另一方面也可以讨论行为补偿的运作、主动的意义维持等问题。