Separating the effects of salience and disparity on the rate of observing

Pigeons producing deliveries of grain on a mixed variable-interval, extinction schedule by pecking a center key could also produce discriminative stimuli on concurrent variable-interval schedules by pecking the left or right observing key. The stimuli produced by each observing key were varied independently. In the first experiment, the negative discriminative stimulus was at the far end of the spectrum from the key illumination accompanying the mixed schedule and from the positive discriminative stimulus. When the magnitude of the difference between the latter two stimuli (salience) was varied, more pecks occurred on the observing key producing the larger of the two differences than on the key producing the smaller difference. In the second experiment, the stimulus accompanying the mixed schedule was at the far end of the spectrum, and the magnitude of the difference between the two discriminative stimuli (disparity) was varied. The proportion of pecks occurring on each observing key shifted systematically in the direction of the key producing the larger difference. The salience of the discriminative stimuli and their disparity each has an independent influence on the frequency of observing when the other is controlled, but the effect of the salience appears to be the more substantial.     

At-entry differences in part-time and full-time employees

Research consistently shows part- and full-time workers to be different on a variety of characteristics such as job satisfaction, organizational commitment and intentions to leave the organization. This study challenges the commonly accepted argument that these differences are due to the different structural conditions of work that are faced by part- and full-time workers. The possibility that these differences are the consequence of at-entry differences in dispositions and orientations to work is tested on a sample of part- and full-time registered nurses who had just begun employment. With one exception the part-and full-time employees were found to be the same on fourteen at-entry characteristics. These results strongly suggest that it is the structural conditions of work that produce the often observed differences found between part- and full-time workers.An earlier version of this paper was presented at the 1991 Midwest Sociological Society Meetings, Des Moines, Iowa, April 11–14. Support for the original data collection came from the Division of Nursing of the Health Resources and Services Administration (R01 NU01050-01A1). Joanne McCloskey is to be thanked for allowing us to use this data set.     

Reduced K+ Channel Inactivation, Spike Broadening, and After-Hyperpolarization in Kvβ1.1-Deficient Mice with Impaired Learning

A-type K⁺ channels are known to regulate neuronal firing, but their role in repetitive firing and learning in mammals is not well characterized. To determine the contribution of the auxiliary K⁺ channel subunit Kvβ1.1 to A-type K⁺ currents and to study the physiological role of A-type K⁺ channels in repetitive firing and learning, we deleted the Kvβ1.1 gene in mice. The loss of Kvβ1.1 resulted in a reduced K⁺ current inactivation in hippocampal CA1 pyramidal neurons. Furthermore, in the mutant neurons, frequency-dependent spike broadening and the slow afterhyperpolarization (sAHP) were reduced. This suggests that Kvβ1.1-dependent A-type K⁺ channels contribute to frequency-dependent spike broadening and may regulate the sAHP by controlling Ca²⁺ influx during action potentials. The Kvβ1.1-deficient mice showed normal synaptic plasticity but were impaired in the learning of a water maze test and in the social transmission of food preference task, indicating that the Kvβ1.1 subunit contributes to certain types of learning and memory.     

Imagery,concreteness, goodness,and familiarity ratings for 500 proverbs sampled from theOxford Dictionary of English Proverbs

Partly in order to facilitate research on the relation between some standard psychological variables, we gathered normative data on 500 proverbs sampled from theOxford Dictionary of English Proverbs (Wilson, 1970). The scales for which we gathered data are imagery, concreteness, goodness , and familiarity. These norms may be of value to researchers who wish to sample linguistic units larger than the word from a set that contains an extensive number of unfamiliar and familiar items. To illustrate the possible uses to which these data may be put, we presented a causal model of the relation between the four variables mentioned above.     

Zitierte zeichenreihen

We use quotation marks when we wish to refer to an expression. We can and do so refer even when this expression is composed of characters which do not occur in our alphabet. That's why Tarski's, Quine's, and Geach's theories of quotation don't work. The proposals of Davidson, Frege, and C. Washington, however, do not provide a plausible account of quotation either. The problem is to construct a Tarskian theory of truth for an object language which contains quotation marks, without appealing to quotation marks in the metalanguage. I propose to supply Tarski's truth definition with an axiom which determines the denotation of all expressions containing quotation marks. According to this axiom, quotation marks create a non-extensional context. Since our admitting such contexts does not lead to any difficulties in our recursive truth characterization, we may indeed dispense with extensionalism. Finally, I argue that we classify and denote expressions in the very same way that we classify and denote extralinguistic entities.     

An evaluation of the cross‐national generalizability of organizational commitment

Using data from two large multinational samples, this research sought to contribute to our knowledge of international organizational behaviour by examining the cross‐national generalizability of organizational commitment. Sample 1 included employees of 10 subsidiaries of a large multinational organization, whereas Sample 2 relied on data collected in 25 nations in the context of a large opinion survey. Results in both samples supported the expectation that measures of commitment would be more susceptible to measurement non‐equivalence than measures of job satisfaction. Differences in relationships between commitment and satisfaction across countries were observed in both samples, as were differences in mean commitment levels. Nation‐level individualism/collectivism (I/C) failed to account for the observed differences, however, suggesting that commitment and I/C are largely independent, despite theoretical arguments to the contrary. Results of the study suggest that despite some cross‐national variation, differences in commitment across national boundaries are small and empirically unrelated to I/C.     

Neural correlates of subliminal and supraliminal letter processing--an event-related fMRI study

One problem of interpreting research on subconscious processing is the possibility that participants are weakly conscious of the stimuli. Here, we compared the fMRI BOLD response in healthy adults to clearly visible single letters (supraliminal presentation) with the response to letters presented in the absence of any behavioural evidence of visibility (subliminal presentation). No letter catch trials served as a control condition. Forced-choice responses did not differ from chance when letter-to-background contrast was low, whereas they were almost 100% correct when contrast was high. A comparison of fMRI BOLD signals for supraliminal and subliminal letters with the control trials revealed a signal increase in left BA 37 (fusiform gyrus). Comparison of supraliminal with subliminal letters showed a significant increase in the right inferior frontal gyrus (BA 44, partly extending to BA 9 and BA 45, as well as BA 46). Finally, a comparison of subliminal with supraliminal letters showed increases in the left middle temporal gyrus (BA 21) and the right extrastriate cortex (BA 19).     

Outcomes from Multisystemic Therapy in a Statewide System of Care

We examined client outcomes from the implementation of Multisystemic Therapy (MST) in a statewide child and adolescent mental health system. Specifically, we examined (1) the validity of therapist-rated MST outcome measures by comparing them to ratings of functional impairment and level of service needs by CAMHD care coordinators, who provide case management and care coordination services, (2) potential client and service predictors of therapist-rated outcomes, and (3) improvement in youth functioning around the time of entry to and exit from MST compared with rates of improvement reported in randomized controlled trials (RCTs) by the developers of MST. Results suggested that therapist-rated MST outcomes were valid indicators of treatment success. Similar to other findings in the MST literature, few client or service characteristics predicted these outcomes. Finally, although MST entry–exit effect sizes were lower than the mean derived from RCTs published by the developers, they were within the 95% confidence interval. Together, these findings support the implementation of MST in complex systems of care with continued attention to quality assurance and ongoing use of data for evaluation.