W. David Pierce

Reinforcement, Reward, and Intrinsic Motivation: A Meta-Analysis

This article reviews research on the effects of reinforcement/reward on intrinsic motivation. The main meta-analysis included 96 experimental studies that used between-groups designs to compare rewarded subjects to nonrewarded controls on four measures of intrinsic motivation. Results indicate that, overall, reward does not decrease intrinsic motivation. When interaction effects are examined, findings show that verbal praise produces an increase in intrinsic motivation. The only negative effect appears when expected tangible rewards are given to individuals simply for doing a task. Under this condition, there is a minimal negative effect on intrinsic motivation as measured by time spent on task following the removal of reward. A second analysis was conducted on five studies that used within-subject designs to evaluate the effects of reinforcement on intrinsic motivation; results suggest that reinforcement does not harm an individual’s intrinsic motivation.

Pervasive negative effects of rewards on intrinsic motivation: The myth continues

A major concern in psychology and education is that rewards decrease intrinsic motivation to perform activities. Over the past 30 years, more than 100 experimental studies have been conducted on this topic. In 1994, Cameron and Pierce conducted a meta-analysis of this literature and concluded that negative effects of reward were limited and could be easily prevented in applied settings. A more recent meta-analysis of the literature by Deci, Koestner, and Ryan (1999) shows pervasive negative effects of reward. The purpose of the present article is to resolve differences in previous meta-analytic findings and to provide a meta-analysis of rewards and intrinsic motivation that permits tests of competing theoretical explanations. Our results suggest that in general, rewards are not harmful to motivation to perform a task. Rewards given for low-interest tasks enhance free-choice intrinsic motivation. On high-interest tasks, verbal rewards produce positive effects on free-choice motivation and self-reported task interest. Negative effects are found on high-interest tasks when the rewards are tangible, expected (offered beforehand), and loosely tied to level of performance. When rewards are linked to level of performance, measures of intrinsic motivation increase or do not differ from a nonrewarded control group. Overall, the pattern of results indicates that reward contingencies do not have pervasive negative effects on intrinsic motivation. Theoretical and practical implications of the findings are addressed.

A theory of activity‐based anorexia

The present paper documents the etiological importance of physical activity to self-starvation in animals and suggests similarities between this research area and the literature concerned with some self-starvation in humans. An activity anorexia is proposed that may account for 38% to 75% of anorexia nervosa. An account of excessive locomotor activity is made in terms of schedule-induced behavior. A reciprocally interactive effect of activity and food ingestion is taken to explain self-starvation for animals and activity anorexia in humans. Literature is reviewed which demonstrates that rats and mice self-starve when they are given access to a running wheel and placed on food restriction. In this paradigm, these animals become excessively active and paradoxically reduce food consumption when compared with control subjects. This evidence and related findings are shown to be consistent with a phylogenetically based model of anorexia. Sociocultural factors are hypothesized to set and maintain the conditions that produce activity anorexia in humans.

Activity‐based anorexia: A biobehavioral perspective

A biobehavioral model of activity-based anorexia is examined in terms of recent evidence. Strenuous exercise reduces the value of food reinforcement and results in decreased food intake. Reduction of food intake increases the motivational value of physical exercise. This produces an escalation in activity that further suppresses appetite. Cultural practices of diet and exercise initiate this anorexic cycle, and once started the process is resistant to change. These anorexias may be the result of natural selection favoring those organisms that became active in times of food scarcity. Proximate physiological mechanism(s) appear to involve the endogenous opiate system that mediates the relationshp between running and eating. It is argued that classification of human self-starvation should be based on environmental and/or biological conditions that control food regulation. Activity anorexia may be one instance of such a classification that could account for many instances of “an orexia nervosa”.

The Debate About Rewards and Intrinsic Motivation: Protests and Accusations Do Not Alter the Results

A prevailing view in education and social psychology is that rewards decrease a person’s intrinsic motivation. However, our meta-analysis (Cameron & Pierce, 1994) of approximately 100 studies does not support this position. The only negative effect of reward occurs under a highly restricted set of conditions, circumstances that are easily avoided. These results have not been well received by those who argue that rewards produce negative effects under a wide range of conditions. Lepper, Keavney, and Drake (1996), Ryan and Deci (1996), and Kohn (1996) have suggested that the questions asked in our meta-analysis were inappropriate, that critical studies were excluded, that important negative effects were not detected, and that the techniques used in our meta-analysis were unsuitable. In this response, we show that the questions we asked are fundamental and that our meta-analytic techniques are appropriate, robust, and statistically correct. In sum, the results and conclusions of our meta-analysis are not altered by our critics’ protests and accusations.

Achievement-Based Rewards and Intrinsic Motivation: A Test of Cognitive Mediators

This study assessed how rewards impacted intrinsic motivation when students were rewarded for achievement while learning an activity, for performing at a specific level on a test, or for both. Undergraduate university students engaged in a problem-solving activity. The design was a 2 2 factorial with 2 levels of reward in a learning phase (reward for achievement, no reward) and 2 levels of reward in a test phase (reward for achievement, no reward). Intrinsic motivation was measured as time spent on the experimental task and ratings of task interest during a free-choice period. A major finding was that achievement-based rewards during learning or testing increased participants’ intrinsic motivation. A path analysis indicated that 2 processes (perceived competence and interest–internal attribution) mediated the positive effects of achievement-based rewards in learning and testing on intrinsic motivation. Findings are discussed in terms of the cognitive evaluation, attribution, and social–cognitive theories.

Choice, matching, and human behavior: A review of the literature.

This review concerns human performance on concurrent schedules of reinforcement. Studies indicate that humans match relative behavior to relative rate of reinforcement. Herrnstein’s proportional matching equation describes human performance but most studies do not evaluate the equation at the individual level. Baum’s generalized matching equation has received strong support with humans as subjects. This equation permits the investigation of sources of deviation from ideal matching and a few studies have suggested variables which control such deviations in humans. While problems with instructional control are raised, the overall findings support the matching law as a principle of human choice.

Positive Effects of Rewards and Performance Standards on Intrinsic Motivation

The present study examined how rewards affect people’s intrinsic motivation when the rewards are tied to meeting increasingly demanding performance standards. The experiment was a 2 x 2 factorial design with 2 levels of performance standard (constant, progressive) and 2 levels of reward (reward, no reward). Using a puzzle-solving task, 60 undergraduate university students were randomly assigned to the experimental conditions. In the constant conditions, participants were required to solve 3 puzzle problems on each of 3 trials; in the progressive conditions, participants were asked to solve 1, 3, and 5 problems over the trials. Half the participants were offered and given

What happened to analysis in applied behavior analysis

1.00 for each correct solution; those in the no-reward condition were not offered pay. The major finding was that participants in the progressive reward condition spent more time on the task in a free-choice session than those in the other conditions. The findings are discussed in terms of different theoretical accounts of rewards and intrinsic motivation and are most consistent with an extension of Eisenberger’s (1992) theory of learned industriousness.

Applied Behavior Analysis: New Directions from the Laboratory

This paper addresses the current help-oriented focus of researchers in applied behavior analysis. Evidence from a recent volume of JABA suggests that analytic behavior is at low levels in applied analysis while cure-help behavior is at high strength. This low proportion of scientific behavior is apparantly related to cure-help contingencies set by institutions and agencies of help and the editorial policies of JABA itself. These contingencies have favored the flight to real people and a concern with client gains, evaluation and outcome strategies rather than the analysis of contingencies of reinforcement controlling human behavior. In this regard, the paper documents the current separation of applied behavior analysis from the experimental analysis of behavior. There is limited use of basic principles in applied analysis today and almost no reference to the current research in the experimental analysis of behavior involving concurrent operants and adjunctive behavior. This divorce of applied behavior research and the experimental analysis of behavior will mitigate against progress toward a powerful technology of behavior. In order to encourage a return to analysis in applied research, there is a need to consider the objectives of applied behavior analysis. The original purpose of behavioral technology is examined and a re-definition of the concept of “social importance” is presented which can direct applied researchers toward an analytic focus. At the same time a change in the publication policies of applied journals such as JABA toward analytic research and the design of new educational contingencies for students will insure the survival of analysis in applied behavior analysis.