Increasing the efficiency of instruction for a person with severe disabilities: The applicability of Fitts' law in predicting response time

The purpose of this study was to demonstrate the applicability of Fitts' law in predicting the response duration of instruction-specific head movements for a person with severe multiple disabilities. Fitts' law is a motoric algorithm that calculates an index of difficulty (ID) for responses in relation to the variables of stimulus width and stimulus amplitude. Four functional tasks from the learner's current continuing education plans were targeted: photocopying, using a paint well, model painting, and communication symbol sequencing. For each of the four tasks, two sets of indices were calculated by (1) holding constant stimulus width while varying amplitude, and (2) holding constant stimulus amplitude while varying width. Results showed that response duration varied as a function of ID variation.     

Stimulus and reinforcer relativity in multiple schedules: Local and dimensional effects on sensitivity to reinforcement

Pigeons' responses in two successive components of multiple schedules were reinforced according to variable-interval schedules of reinforcement that varied over five different conditions. Within each session of all conditions, line orientations of 0°, 30°, or 45° in Component 1 alternated with orientations of 45°, 60°, or 90° in Component 2. Response rates were recorded in three successive subintervals of each component. Ratios were taken between the response rate in each Component 1 line orientation and the response rate in each Component 2 orientation. These ratios were found to be power functions of the corresponding ratios of obtained reinforcement rates. Sensitivity of response ratios to changes in reinforcer ratios, given by the value of the exponent of the power function, increased systematically with increasing disparity between the dimensional values of orientation stimuli. In addition, sensitivity decreased systematically over successive subintervals of components, that is, with increasing time since component alternation. Dimensional and local (subinterval) effects interacted in that sensitivity increased with stimulus disparity to a far greater extent in the first subinterval than later in components. The data could be described by a combination of rectangular hyperbolae which attributed the interaction between local and dimensional effects to limits set by local effects on the extent that stimulus differences could affect sensitivity.     

Confirmation of linear system theory prediction: Changes in Herrnstein's k as a function of changes in reinforcer magnitude

Eight human subjects pressed a lever on a range of variable-interval schedules for 0.25¢ to 35.0¢ per reinforcement. Herrnstein's hyperbola described seven of the eight subjects' response-rate data well. For all subjects, the y-asymptote of the hyperbola increased with increasing reinforcer magnitude and its reciprocal was a linear function of the reciprocal of reinforcer magnitude. These results confirm predictions made by linear system theory; they contradict formal properties of Herrnstein's account and of six other mathematical accounts of single-alternative responding.     

Intuitions about sample size: the empirical law of large numbers

According to Jacob Bernoulli, even the ‘stupidest man’ knows that the larger one's sample of observations, the more confidence one can have in being close to the truth about the phenomenon observed. Two-and-a-half centuries later, psychologists empirically tested people's intuitions about sample size. One group of such studies found participants attentive to sample size; another found participants ignoring it. We suggest an explanation for a substantial part of these inconsistent findings. We propose the hypothesis that human intuition conforms to the ‘empirical law of large numbers’ and distinguish between two kinds of tasks–one that can be solved by this intuition (frequency distributions) and one for which it is not sufficient (sampling distributions). A review of the literature reveals that this distinction can explain a substantial part of the apparently inconsistent results. © 1997 John Wiley & Sons, Ltd.     

Applying the law therapeutically

Therapeutic jurisprudence is the study of the law as a therapeutic agent. Although much of therapeutic jurisprudence focuses on possible changes to the law, one important interdisciplinary dimension of the endeavor involves the therapeutic application of existing law. Examples are provided of therapeutic application of existing law, and this exercise is proposed as a promising path for applied psychology.     

Common Law Approaches to the Relationship Between Law and Morality

How are general relations of law and morality typically conceived in an environment of Anglo-saxon common law? This paper considers some classical common law methods and traditions as these have confronted and been overlaid with modern ideas of legal positivism. While classical common law treated a community and its morality as the cultural foundation of law, legal positivism's analytical separation of law and morals, allied with liberal approaches to legal regulation, have made the relationship of legal and moral principles more complex and contested. Using ideas from Durkheim's and Weber's sociology, I argue that the traditional common law emphasis on an inductive, empirical treatment of moral practices has continuing merit, but in contemporary conditions the vague idea of community embedded in classical common law thought must be replaced with a much more precise conceptualisation of coexisting communities, whose moral bonds are diverse and require a corresponding diversity of forms of legal recognition or protection.     

The International Significance of Human Rights

A comparative examination of four alternative ways of understandingwhat human rights are supports an institutional understanding assuggested by Article 28 of the Universal Declaration: Human rightsare weighty moral claims on any coercively imposed institutionalorder, national or international (as Article 28 confirms). Any suchorder must afford the persons on whom it is imposed secure accessto the objects of their human rights. This understanding of humanrights is broadly sharable across cultures and narrows the philosophical and practical differences between the friends ofcivil and political and the champions of social, economic, andcultural human rights. When applied to the global institutionalorder, it provides a new argument for conceiving human rights asuniversal – and a new basis for criticizing this order as tooencouraging of oppression, corruption, and poverty in the developing countries: We have a negative duty not to cooperatein the imposition of this global order if feasible reforms ofit would significantly improve the realization of human rights.     

Civil Ethics and the Validity of Law

This paper aims to clarify the nature and contents of 'civil ethics' and the source of the binding force of its obligations. This ethics should provide the criteria for evaluating the moral validity of social, legal and morally valid law. The article starts with observing that in morally pluralist Western societies civil ethics already exists, and has gradually started to play the role of guiding the law. It is argued that civil ethics should not be conceived as 'civic morals' which is in fact rather 'state ethics', nor as 'public ethics' which is said to reach its perfection when it becomes law, nor as ethics applicable primarily to the basic structure of a society (political liberalism), but instead as a citizens' ethics. Subsequently the paper attempts to show what the contents of this ethics are, and which ethical theory would be able to ground its obligations.     

Scientia Iuris - An Unsolved Philosophical Problem

Legal dogmatics in Continental European law (scientia iuris, Rechtswissenschaft) consists of professional legal writings whose task is to systematize and interpret valid law. Legal dogmatics pursues knowledge of the existing law, yet in many cases it leads to a change of the law. Among general theories of legal dogmatics, one may mention the theories of negligence, intent, adequate causation and ownership. The theories produce principles and they also produce defeasible rules. By means of production of general and defeasible theories, legal dogmatics aims at obtaining a system of law that is both internally coherent and harmonized with its background in morality and (political) philosophy. Legal dogmatics is necessary in the context of constitutional constraints on the majority rule. Only if the courts act on the basis of Reason they can be a legitimate counterpart of the majority rule. And Reason cannot be exhausted by particular decision making. It also needs a more abstract deliberation, given by expert jurists. However, legal dogmatics has been a target of several kinds of criticism: empirical, morally-political, epistemological, logical, and ontological. The position taken in this article is to answer such criticism by mutually adjusting philosophy and the practices of the law.     

论齐法家思想中国际法萌芽

春秋战国时期是第一个大变局时期。在政治格局上,亲缘政治开始瓦解而地缘政治开始兴起。诸侯国兴起,春秋的历史基本上都是围绕着“争霸”这个主题展开的:制度改革、学术争鸣以及兼并战争。齐法家在春秋时期通过一系列主张帮助齐国在争霸中强大起来。笔者认为,其主张中已经包含接近现代国际法的国际法理念。齐法家思想中的国际法要素主要体现在齐国主持的历次会盟的盟约,以及齐法家的代表人物的外交活动中所遵循的原则中,本文着重从这两个方面展开论述。