Understanding environments: The key to improving social processes and program outcomes

The contributions to this Special Issue illustrate research on several important types of environmental units, including psychiatric and substance abuse treatment programs, neighborhood block groups, and entire communities. They also exemplify alternative methodologies, such as assessing environments by relying on participants' appraisals, external observers' ratings, historical archives, and direct observation. I draw on these contributions and some of my own work to discuss four recurrent issues: (a) how to conceptualize environmental domains and dimensions; (b) how to understand environmental dynamics, that is, the interplay of environmental factors both within one setting and across settings; (c) how to comprehend the processes that link environmental factors to outcomes, especially with respect to the power and evanescence of environmental influence; and (d) how to use information about environments to monitor and improve them. Increased knowledge in these four areas is essential to help fulfill a major aim of community psychology: to understand social processes and improve intervention program outcomes.     

Environmental Choice and Control In Community Care Settings for Older People1

This study focuses on the long-term stable levels of environmental choice and control available in community care settings, and explores how variations in these factors affect elderly residents of such settings. New methods to evaluate naturally-existing levels of policy choice and resident control are developed and applied to a representative sample of residential care facilities. The findings showed that residents with more functional resources, and women residents, were inore likely to live in facilities high in choice and control, and that these personal and environmental factors were associated with better resident functioning and more cohesive, independence-oriented social environments with relatively little conflict. Functionallyable residents reacted more positively to high control and women residents reacted more positively to high choice. Investigators who attempt to manipulate perceived control in institutional settings need to consider the existing opportunities residents have to exercise control, as well as the levels of other relevant personal and environmental resources.     

The perceptual onset of musical tones

The perceptual onset of a musical tone can be defined as the moment in time at which the stimulus is first perceived. In the present experiments, a simple threshold model for the perceptual onset was applied. A paradigm was used in which a sequence of tones had to be adjusted in such a way that the onsets were perceived at equally spaced moments in time. In Experiment 1, the threshold model was applied in a design in which the rise times of the tones were varied. We concluded that the perceptual onsets of the tones can, indeed, be defined as the times at which the envelopes pass a relative threshold of 15 dB below the maximum level of the tones (82 dB). In Experiment 2, the maximum levels of the tones were varied from 37 to 77 dB. The results show that there is a shift in the relative threshold, but that this shift is small relative to the shift in the stimulus level. In Experiment 3, the effect of level above masked threshold on the perceptual onset was investigated in more detail by varying the level of a background noise. The results show that the relative threshold decreases with increasing level above masked threshold. The results from our experiments strongly suggest that the relative threshold is linearly dependent on the level above masked or absolute threshold and that a 7-dB increment of this level results in a 1-dB relative threshold decrement. The threshold model is compared with a current temporal integration model for the perceptual onset of tones. It is shown that our data cannot be adequately explained by temporal integration. Our experimental results suggest that adaptation of the hearing mechanism to a certain relative stimulus level is responsible for perceptual onset. The applicability of our threshold model in various realistic musical situations is discussed.     

On Chomskyan mentalism: A reply to Peter Slezak

Conclusion Introducing his paper, Slezak (p. 428) proposes to examine Botha's criticisms in detail with a view to demonstrating that they are without foundation and are based on the most fundamental misunderstandings. Concluding his paper, Slezak (p. 439) expresses the hope that he has shown that the conceptions on which these criticisms rest are so seriously flawed as to make it unprofitable to attempt to unravel the rest of his analysis. These formulations, by all standards, represent rather strong rhetoric. But, as the preceding paragraphs have shown, Slezak's discussion sadly lacks the relevant and accurate analyses needed to give substance to his rhetoric.I would like to thank Marina Savini and Thereza Botha for suggestions which led to improvements in the formulation of this paper.