PubMed · 5584904
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W K Hofstee. 1967. Models in split-half reliability.. https://pubmed.ncbi.nlm.nih.gov/5584904/
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This paper critically analyses the historical embeddedness and ideological functions of the concept of community as it is used in South Africa by representatives of the state and its opponents. The analysis shows that 'community' is a key concept in the ideology of separatism through which an apartheid psychology and society is reproduced. This has implications for progressive psychologists who aim to empower oppressed ordinary people through interventions based upon theoretical models of community. Some of these are explored by examining the interplay between political and theoretical images of community and ordinary people's ideas about social ills. This suggests that whilst community psychology can revitalise a sense of community amongst the oppressed, it may also reinforce existing social inequalities by deflecting experts and ordinary people from the reconstruction of individual agency upon which liberating social transformation depends. It is concluded that a central task for South African psychologists is to engage in critical self-reflection with the aim of identifying and eliminating oppressive forms of social and psychological discourse, thereby empowering themselves and contributing to the construction of a coherent counterideology.
The visual estimation of object velocity in systems of tuned bilocal detector units (simplified Hassenstein-Reichardt detectors) is investigated. The units contain delay filters of an arbitrary low-pass characteristic. Arrays of such detector units with identical delay filters are assumed to cover the plane of analysis. The global evaluation of the output signals of suitably arranged detector units is exemplified by the analysis of frontoparallel translations of rigid objects. The correlative method permits the estimation of the instantaneous object velocity, independently of object form. The time course of the resulting estimate is shown to be the convolution of the true velocity profile with a time-invariant kernel that depends solely on the impulse response of the delay filters and thus characterizes the analyzer system. The mathematical analysis of the processing principle is illustrated by considering idealized detector systems. The response of correlative motion analyzers to compound motion and to motion of nonrigid objects is discussed.
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