Local patterns in human operant behavior and a behaving model to interrelate animal and human performances

College students pressed buttons for points delivered according to molecular concurrent reinforcement contingencies similar to those used in previous experiments with animal subjects. Relative frequency of reinforcement and the relative and absolute durations of two reinforced patterns of button pressing were experimentally varied. Qualitative effects of all three variables resembled those obtained previously with animals. Computer simulation of a cognitive processing model described these qualitative effects. A similar model was used previously to describe corresponding behavior in pigeons. Therefore, similar cognitive processing may underlie the local temporal patterning of animal and human operant behavior maintained by this concurrent reinforcement contingency.     

Investment behavior and the negative side of emotion

Can dysfunction in neural systems subserving emotion lead, under certain circumstances, to more advantageous decisions? To answer this question, we investigated how normal participants, patients with stable focal lesions in brain regions related to emotion (target patients), and patients with stable focal lesions in brain regions unrelated to emotion (control patients) made 20 rounds of investment decisions. Target patients made more advantageous decisions and ultimately earned more money from their investments than the normal participants and control patients. When normal participants and control patients either won or lost money on an investment round, they adopted a conservative strategy and became more reluctant to invest on the subsequent round; these results suggest that they were more affected than target patients by the outcomes of decisions made in the previous rounds.     

Image analysis of small animal feeding behavior

The optimal design of behavioral experiments includes measures to minimize observer bias while maximizing researcher efficiency. To this end, we have developed a reliable, autonomous monitor of animal feeding behavior. Previous studies of caterpillar (Manduca sexta) feeding have relied on human observation for visual evaluation of food consumption at specific time points over the course of several hours. This method is eliminated by our newbehavior rig, which collects data automatically. Individual animals are monitored via CCD cameras activated in sequence by a computer. Images are obtained at preset time intervals using a frame grabber to capture still pictures from the cameras. Subsequently, images are analyzed using software written in MatLab to determine food selection and quantify consumption.     

The analysis of human behavior in context

Does the name of the special interest group, “The Experimental Analysis of Human Behavior,” imply that those who analyze the behavior of human animals must organize themselves apart from those who analyze the behavior of nonhuman animals? Is the use of nonhumans in experiments really not relevant to the analysis of the behavior of humans? If so, then something must have changed. Many differences exist, of course, between the behavior of humans and nonhumans—humans, for example, cannot fly under their own power—but have we really isolated differences in principle, differences that require separate organizations for the study of each? I will try to indicate why I believe this is a serious concern, where the concern comes from, and what, perhaps, might be done to maintain what was once a flourishing bidirectional relation between research with humans and nonhumans, in both basic and applied research.     

Toward an animal model of type A behavior

Time estimation and dominance tests were used to differentiate the behavior of Mongolian gerbils to be analogous to Type A and Type B human behavior. Preliminary classification of animals as "Type A" or "B" was based upon differential performance on DRL 20-sec and DRL 60-sec reinforcement schedules. To retain their preliminary classification, Type A and Type B animals were required to be dominant and subordinate, respectively, in matches with each of three same-sex animals of opposite behavioral classification. Following classification, breeding pairs were constituted and classification procedures were repeated with two succeeding generations. Animals that exhibited Type A timing "won" significantly more dominance matches than did Type B animals. Incidence rates of Type A and Type B behavior in the two selectively bred generations were significantly greater than frequencies in the original stock generation. The usefulness of the present animal model for investigating the association of Type A behavior with coronary heart disease is discussed.     

The relationship context of human behavior and development

The influence of social relationships on human development and behavior is receiving increased attention from psychologists, who are central contributors to the rapidly developing multidisciplinary field of relationship science. In this article, the authors selectively review some of the significant strides that have been made toward understanding the effects of relationships on development and behavior and the processes by which relationships exert their influence on these, with the purpose of highlighting important questions that remain to be answered, controversial issues that need to be resolved, and potentially profitable paths for future inquiry. The authors' thesis is that important advances in psychological knowledge will be achieved from concerted investigation of the relationship context in which most important human behaviors are developed and displayed.     

An ethologist aboard hms beagle: The young darwin's observations on animal behavior

Darwin's notes from the Beagle period abound with observations on animal behavior. Although in places anecdotal and anthropomorphic, they include many detailed, lively comments of the activities of birds, reptiles, mammals, Crustacea, insects, and other invertebrates. In his comparative approach, belief in the importance of heredity, an understanding that behavior might be of assistance in taxonomy, and that it was linked with both the organism's morphology and habitat, and his attempts at experiments, Charles Darwin in his early and mid-twenties was using techniques and concepts that were to be of great significance in his later work.     

The renaissance of the experimental analysis of human behavior

Ten years ago, a number of authors commented on the dismal state of the basic research area known as the experimental analysis of human behavior (EAHB). At that time, data on the number of research articles using human subjects published in the Journal of the Experimental Analysis of Behavior (JEAB) indicated little progress since the early 1960s. However, updated publication data through 1991 reveal that EAHB research has accelerated in the last decade, reaching a peak of nearly half of all research articles published in JEAB, with an increasing trend evident. The increase in this percentage is not due solely to a long-term declining trend in the total number of experimental articles in JEAB using either human or nonhuman subjects, a trend that appears to have slowed or stabilized in the last 6 years. These data indicate that the EAHB has made dramatic progress in a decade and is healthy and growing.