RSCORE-J: Pooled rating-method data: A computer program for analyzing pooled ROC curves

RSCORE-J, a computer program for a signal-detection analysis of pooled rating-method data, is listed and described. RSCORE-J computes jackknife estimates of ROC parameters and their standard errors from rating-method data pooled over a group of observers.     

Further evidence for sublexical components in implicit memory for novel words

This study provides further evidence for the notion, proposed by Dorfman (1994), that activation of sublexical components plays an important role in implicit memory for novel words. Priming in an identification task was observed consistently when nonwords were formed out of morphemes; weaker, more variable effects were observed when nonwords were composed of syllables or pseudosyllables. Priming was insensitive to changes in the surface features (type case) of the stimuli and was disrupted by rearrangement of the stimulus components. Results are interpreted in terms of the activation and integration of preexisting sublexical representations and as evidence against the role of newly established episodic or perceptual representations. It is concluded that findings of priming for novel information should not be taken as evidence against an activation view.     

The likelihood function of additive learning models: Sufficient conditions for strict log-concavity and uniqueness of maximum

Luce introduced a family of learning models in which response probabilities are a function of some underlying continuous real variable. This variable can be represented as an additive function of the parameters of these learning models. Additive learning models have also been applied to signal-detection data. There are a wide variety of problems of contemporary psychophysics for which the assumption of a continuum of sensory states seems appropriate, and this family of learning models has a natural extension to such problems. One potential difficulty in the application of such models to data is that estimation of parameters requires the use of numerical procedures when the method of maximum likelihood is used. Given a likelihood function generated from an additive model, this paper gives sufficient conditions for log-concavity and strict log-concavity of the likelihood function. If a likelihood function is strictly log-concave, then any local maximum is a unique global maximum, and any solution to the likelihood equations is the unique global maximum point. These conditions are quite easy to evaluate in particular cases, and hence, the results should be quite useful. Some applications to Luce's beta model and to the signal-detection learning models of Dorfman and Biderman are presented.     

Positive and negative mood following imaging-guided core needle breast biopsy and receipt of biopsy results

Positive and negative mood are independent psychological responses to stressful events. Negative mood negatively impacts well-being and co-occurring positive mood leads to improved adjustment. Women undergoing core needle breast biopsies (CNB) experience distress during CNB and awaiting results; however, influences of mood are not well known. This longitudinal study examines psychosocial and biopsy- and spirituality-related factors associated with mood in patients day of CNB and one week after receiving results. Ninety women undergoing CNB completed questionnaires on psychosocial factors (chronic stress, social support), biopsy experiences (pain, radiologist communication), and spirituality (peace, meaning, faith) day of CNB. Measures of positive and negative mood were completed day of CNB and one week after receiving results (benign n = 50; abnormal n = 25). Multiple linear regression analyses were conducted. Greater positive mood correlated with greater peace (β = .25, p = .02) day of CNB. Lower negative mood correlated with greater peace (β = ?.29, p = .004) and there was a trend for a relationship with less pain during CNB (β = .19, p = .07). For patients with benign results, day of CNB positive mood predicted positive mood post-results (β = .31, p = .03) and only chronic stress predicted negative mood (β = .33, p = .03). For women with abnormal results, greater meaning day of CNB predicted lower negative mood post-results (β = ?.45, p = .03). Meaning and peace may be important for women undergoing CNB and receiving abnormal results.     

Leadership and substitutes for leadership among professional and nonprofessional workers.

In this article, the authors discuss their research on similarities and differences between professionals and nonprofessionals in their responses to managerial leadership behaviors and substitutes for leadership. Their study sample comprised workers at many organizational levels in several hospital and contract research organizations in the Southwest, and they used a multidimensional measure of professionalism to create subsamples of professionals and nonprofessionals. The authors used questionnaire data to test hypotheses regarding instrumental and supportive leadership behaviors and their substitutes. They found that role clarification and support from leaders were important predictors of worker's job satisfaction and organizational commitment for both subsamples, and that formal rules and procedures were an important supplement for instrumental leadership behaviors. Professionals differed from nonprofessionals in that intrinsically satisfying work tasks and importance place on organizational rewards were strong substitutes for leaders' support. The authors conclude that worker professionalism is an important moderator variable for research on leadership and substitutes for leadership.     

Maximum likelihood estimation of parameters of signal detection theory—A direct solution

Ogilvie and Creelman have recently attempted to develop maximum likelihood estimates of the parameters of signal-detection theory from the data of yes-no ROC curves. Their method involved the assumption of a logistic distribution rather than the normal distribution in order to make the mathematics more tractable. The present paper presents a method of obtaining maximum likelihood estimates of these parameters using the assumption of underlying normal distributions.This research was supported in part by grants from the National Institutes of Health, MH-10449-02, and from the National Science Foundation, NSF GS-1466.     

Recall and recognition processes in motor memory: effects of feedback and knowledge of results delay

In linear movement tasks of 200 msec (Experiment 1 -ballistic movement) and 500 msec (Experiment 2 - nonballistic movement), motor recall strength was assessed by absolute, constant, and variable error; recognition strength was assessed by Z'-transformed actual-estimate correlations and absolute actual-estimate difference scores. Contrary to predictions, neither increased KR delay (45 vs. 5 sec) nor limited visual-auditory-tactile feedback caused decrements in recognition processes over KR-training or KR-withdrawal trial blocks for the 200-msec task. In the 500-msec task, the independent variables impaired recognition through training and transfer trials but impaired recall only in the training trials. Results generally did not support the hypothesized independence between recall and recognition processes. Several methodological issues related to recall, and recognition research were discussed.