A look at the AMA Guides to the Evaluation of Permanent Impairment: Problems in workers' compensation claims involving mental disability

Mental disability claims for workers' compensation are troublesome for courts and clinicians. The overall pattern is one of a chaos of state legislative and judicial restrictions on recovery. A notable exception to this chaos is the use in the majority of American jurisdictions of the uniform system for determining mental impairment contained in the American Medical Association's Guides to the Evaluation of Permanent Impairment. The use of the Guides seems to have promoted uniformity among jurisdictions and greater acceptance of mental disability claims. A new problem with the Guides may lay ahead as the courts try to apply the third edition. This recent revision does not contain a percentage rating system for mental impairment. The availability of this system, and in the first edition of a diagnostic system, has long been attractive to courts, although it has undermined the AMA's goal of objective evaluation.     

Means-means-end tool choice in cotton-top tamarins (Saguinus oedipus): finding the limits on primates’ knowledge of tools

Most studies of animal tool use require subjects to use one object to gain access to a food reward. In many real world situations, however, animals perform more than one action in sequence to achieve their goals. Of theoretical interest is whether animals have the cognitive capacity to recognize the relationship between consecutive action sequences in which there may be one overall goal and several subgoals. Here we ask if cotton-top tamarins, a species that in captivity uses tools to solve means-end problems, can go one step further and use a sequence of tools (means) to obtain food (end). We first trained subjects to use a pulling tool to obtain a food reward. After this initial training, subjects were presented with problems in which one tool had to be used in combination with a second in order to obtain food. Subjects showed great difficulty when two tools were required to obtain the food reward. Although subjects attended to the connection between the tool and food reward, they ignored the physical connection between the two tools. After training on a two-tool problem, we presented subjects with a series of transfer tests to explore if they would generalize to new types of connections between the tools. Subjects readily transferred to new connections. Our results therefore provide the first evidence to date that tamarins can learn to solve problems involving two tools, but that they do so only with sufficient training.     

Mirror neurons are not evidence for the Simulation Theory

Recently, there as been a resurgence of interest in theories of mindreading. New discoveries in neuroscience have revitalized the languishing debate. The discovery of so-called mirror neurons has revived interest particularly in the Simulation Theory (ST) of mindreading. Both ST proponents and theorists studying mirror neurons have argued that mirror neurons are strong evidence in favor of ST over Theory Theory (TT). In this paper I argue against the prevailing view that mirror neurons are evidence for the ST of mindreading. My view is that on an appropriate construal of their function, mirror neurons do not operate like simulation theorists claim. In fact, mirror neurons are more appropriately understood as one element in an information-rich mindreading process. As such, mirror neurons fit in better with some sort of TT account of mindreading. I offer a positive account, the Model TT, which better explains the role of mirror neurons in social cognition.     

A brief history of primary prevention in the twentieth century: 1908 to 1980

While primary prevention is a much talked about and debated topic in contemporary psychology, it has a considerable history. This paper critically traces primary prevention, philosophy and practice, in the 20th century. Beginning with the mental hygiene movement (1908-1960), the paper progresses to examine the child guidance movement (1920-1955), the eugenics movement (1860-1955), the initial era of federal involvement (1930s, 1940s) as well as significant research, events, and legislation in the decades between 1950 and 1980. The paper concludes with a synopsis of the major themes revealed by the review and suggestions for future efforts in prevention.     

On Whether we Can See Intentions

Direct Perception is the view that we can see others' mental states, i.e. that we perceive others' mental states with the same immediacy and directness that we perceive ordinary objects in the world. I evaluate Direct Perception by considering whether we can see intentions, a particularly promising candidate for Direct Perception. I argue that the view equivocates on the notion of intention. Disambiguating the Direct Perception claim reveals a troubling dilemma for the view: either it is banal or highly implausible.     

A microprocessor-based psychopathology laboratory: I. Why bother?

The greater than usual need for stimulus control, closed-loop design to control for organic state variables, and the acquisition of complex data on thought disorders makes on-line microprocessors especially important in psychopathology research.     

A microprocessor-based psychopathology laboratory: II. Research goals and design prerequisites

The design of a microprocessor-based psychopathology laboratory is influenced by (1) special procedures in many experimental paradigms and (2) some theoretical considerations about psychopathological data. In terms of design prerequisites, these are summarized as flexibility and power to control a spectrum of experiments, large data-processing capacity, ability to provide clinically relevant data on short notice, mobility, and simplicity of operation and programming.