The evolution of challenges to researchers in health psychology

One of the keynote addresses presented at the National Working Conference on Research in Health and Behavior. This address is a historical review of current challenges to researchers in health psychology. Current challenges discussed include (a) creation of physical pathology, (b) physical symptoms of physical pathology in the absence of true pathology, (c) increased or decreased vulnerability to infectious disease, (d) intensify, prolong, or diminish existing pathology, (e) individuals' preoccupation with illness or disease, (f) voluntarily engaging in health-threatening behavior (e.g., allowing toxic agents to enter the body or engaging in accident-prone behavior or high-risk sexual practices), (g) engaging in health-enhancing life-style behaviors, and (h) involuntarily becoming the victim of toxic agents. The shift in public health policy as related to psychological research--from mental health to physical illness--reflects societal support for such areas of research by health psychologists.     

Awareness Effects of a Youth Suicide Prevention Media Campaign in Louisiana

Research on the efficacy of mediated suicide awareness campaigns is limited. The impacts of a state‐wide media campaign on call volumes to a national hotline were analyzed to determine if the advertisements have raised awareness of the hotline. We use a quasi‐experimental design to compare call volumes from ZIP codes where and when the campaign is active with those where and when the campaign is not active. Multilevel model estimates suggest that the campaign appears to have significantly and substantially increased calls to the hotline. Results from this study add evidence to the growing public health literature that suggests that mediated campaigns can be an effective tool for raising audience awareness.     

Book reviews

Rosenbaum, D.A. (1991). Human motor control. New york: Academic Press. Pp. 411. ISBN 0-12-597300-4. $35.95.

Altmann, G.T.M. (Ed.) (1989). Parsing and interpretation. hove, Sussex: Lawrence Erlbaum Associates Ltd. Pp. 376. ISBN 0-86377-143-2. £19.95.

Johnson-Laird, P.N. & Byrne, R.M.J. (1991). Deduction. Hove: Lawrence Erlbaum Associates Ltd. Pp. 256. ISBN 0-86377-148-3. £14.95.

Singer, M. (1990). Psychology of language: An introduction to sentence and discourse processing. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp xi + 308. ISBN 0-8058-0005-0. £21.50.     

Bias in Conditional Inference: Implications for Mental Models and Mental Logic

Three experiments are reported in which subjects are given the opportunity to make any of the four inferences associated with conditional statements: modus ponens (MP), denial of the antecedent (DA), affirmation of the consequent (AC), and modus tollens (MT). The primary purpose of the research was to establish the generality and robustness of polarity biases that may be occasioned by systematic rotation of negative components in the conditional rules. In Experiments 1 & 2, three forms of conditionals were used: “if (not) p then (not) q”, “(not) p only if (not) q” and “(not) q if (not) p”. Experiment 1 used a conclusion evaluation task, whereas Experiment 2 used a conclusion production task. In Experiment 3, thematic conditionals were presented with and without a preceding scenario.

The biases investigated were (a) affirmative premise bias—the tendency to draw more inferences from affirmative premises and (b) negative conclusion bias—the tendency to draw more inferences with negative conclusions. The suggestive evidence for affirmative premise bias in the literature was not supported: very little evidence was found for it in the current experiments. Robust findings of negative conclusion bias were, however, found across the three experiments, although the bias was mostly restricted to DA and MT inferences. This suggests that the bias is best regarded as a difficulty with double negation.

The results are discussed with respect to both the mental logic and mental model accounts of propositional reasoning. Neither theory as currently formulated can explain all of our findings, although a plausible revision of each is considered.