Taking personality selection bias seriously in animal cognition research: a case study in capuchin monkeys (Sapajus apella)

In most experimental work on animal cognition, researchers attempt to control for multiple interacting variables by training subjects prior to testing, allowing subjects to participate voluntarily, and providing subjects with food rewards. However, do such methods encourage selection bias from subjects’ personalities? In this study, we trained eighteen zoo-housed capuchin monkeys (Sapajus apella) for two experiments, under conditions of positive reinforcement (i.e. food rewards) and free-choice participation. Using a combination of behavioral and rater-based methods, we identified and validated five personality dimensions in these capuchins (Assertiveness, Openness, Neuroticism, Sociability, and Attentiveness). Scores on Openness were positively related to individual differences in monkey task participation, reflecting previous work showing that such individuals are often more active, curious, and willing to engage in testing. We also found a negative relationship between scores on Assertiveness and performance on tasks, which may reflect the trade-offs between speed and accuracy in these animals’ decision-making. Highly Assertive individuals (the most sociable within monkey groups) may also prioritize social interactions over engaging in research. Lastly, monkeys that consistently participated and performed well on both tasks showed significantly higher Openness and lower Assertiveness compared to others, mirroring relationships found between personality, participation, and performance among all participants. Participation and performance during training was clearly biased toward individuals with particular personalities (i.e. high Openness, low Assertiveness). Results are discussed in light of the need for careful interpretation of comparative data on animal cognition and the need for researchers to take personality selection bias more seriously.     

Activity Group Therapy of a Dull Boy with Severe Body EGO Problems

The presence of a time limit shapes the entire therapeutic process and culminates in the management of termination. This paper outlines a protocol for dealing with termination in time-limited psychotherapy groups: (1) Select suitable members with similar capacity to use a time-limited format; (2) use a closed group format; (3) clarify the time boundaries at the beginning; (4) reinforce the time frame during the last half of the group; (5) provide focused interventions; (6) forestall premature termination; (7) reinforce termination themes of deprivation, resentment and anger, rejection, grief and loss, responsibility for self; (8) structure the final session; and (9) plan a 4-month follow-up visit to encourage ongoing application. These guidelines provide the therapist with a general structure to ensure that major termination themes are systematically addressed. They deal with powerful concepts of maturation and self-responsibility and incorporate the principal strategies that distinguish time-limited from time-unlimited group psychotherapy.     

Emotion in man as Tested by the Delta Index of the Electroencephalogram: II. Simultaneous Records from Cortex and from a Region Near the Hypothalamus

Five male undergraduates could earn 4¢ for every 200 knob-pulls. In addition, they could avoid or terminate an aversive tone by pressing a button with a force of 1.5 lbs (nonaggressive response) or by hitting a cushion with at least 20 lbs force (aggressive response). Rates of aggression tended to be higher during sessions where money was taken from the Ss at the rate of 1¢ per 12 seconds than during sessions when taking was not in effect. Rates of nonaggressive responses were constant across conditions.     

An Operant Electromagnetic Chamber

Forty-eight middle-class fathers having their first child were divided into three groups: An Experimental Group received a demonstration of physical and behavioral characteristics of their own infants resulting in a doubling of the usual time for interaction during the first two days. A Hospital Group spent the same amount of time viewing a prepared videotape of the same characteristics of a newborn infant who was not theirs. An Office Control Group, without experimental intervention, was recruited to control for effects of demand characteristics of the experimental situation. All three groups attended their infants' one-month well-baby examination where outcome measures were obtained. Analyses of variance showed no differences between groups on demographic or pregnancy variables. Further, 108 analyses of variance for 36 father and infant behaviors scored from videotapes did not reveal significant group differences. It is argued that in addition to amount of early contact and sex of parent, crucial socioeconomic factors need to be considered.     

A stop-signal task for sheep: introduction and validation of a direct measure for the stop-signal reaction time

Huntington’s disease (HD) patients show reduced flexibility in inhibiting an already-started response. This can be quantified by the stop-signal task. The aim of this study was to develop and validate a sheep version of the stop-signal task that would be suitable for monitoring the progression of cognitive decline in a transgenic sheep model of HD. Using a semi-automated operant system, sheep were trained to perform in a two-choice discrimination task. In 22% of the trials, a stop-signal was presented. Upon the stop-signal presentation, the sheep had to inhibit their already-started response. The stopping behaviour was captured using an accelerometer mounted on the back of the sheep. This set-up provided a direct read-out of the individual stop-signal reaction time (SSRT). We also estimated the SSRT using the conventional approach of subtracting the stop-signal delay (i.e., time after which the stop-signal is presented) from the ranked reaction time during a trial without a stop-signal. We found that all sheep could inhibit an already-started response in 91% of the stop-trials. The directly measured SSRT (0.974 ± 0.04 s) was not significantly different from the estimated SSRT (0.938 ± 0.04 s). The sheep version of the stop-signal task adds to the repertoire of tests suitable for investigating both cognitive dysfunction and efficacy of therapeutic agents in sheep models of neurodegenerative disease such as HD, as well as neurological conditions such as attention deficit hyperactivity disorder.     

Moral duty or moral defence? The effects of perceiving shared humanity with the victims of ingroup perpetrated harm

Previous theory and research suggests that perceiving shared humanity with others should be a positive force for intergroup relations. The present research considers the alternative possibility, that notions of shared humanity might protect people from feelings of guilt over ingroup perpetrated harm by obscuring the ingroup's unique role in these events. Consistent with this idea, Study 1 (N = 58) found that perceiving shared humanity with a harmed outgroup was associated with less guilt and stronger expectations of forgiveness among members of the perpetrator group. Study 2 (N = 52) demonstrated that these effects only occurred when the moral integrity of the ingroup was open to question. When ingroup morality was instead secure, defensive use of humanity was not apparent. Together, these studies suggest that perceiving harmful ingroup actions as ‘only human’ can sometimes be a moral defence that absolves group members of feelings of responsibility for wrongdoing. Copyright © 2010 John Wiley & Sons, Ltd.     

Paradoxes of praise: Identity‐inconsistent praise results in praise‐inconsistent responses

In four experimental studies, we explored the effect of consistency between central group values and the content of group‐directed praise on group‐based esteem, group identification, and willingness to express attitudes and intentions (in)consistent with the content of praise. Study 1 used pre‐existing groups with clearly defined central values, Study 2 relied on individual differences in perceptions of central group values within the same social group, and Studies 3 and 4 manipulated the centrality of group values experimentally. The results demonstrated that identity‐inconsistent praise resulted in lower group‐based esteem (Studies 1–4), and reduced group identification (Study 4), as compared to identity‐consistent praise. In addition, in all studies, identity‐inconsistent praise led to stronger willingness to reaffirm (the ignored) central group characteristics than identity‐consistent praise. The results are consistent with extensions of the self‐verification approach to the collective self.     

Central and Marginal Forgiveness: Comments on Charles Griswold’s <Emphasis Type="Italic">Forgiveness; a Philosophical Exploration</Emphasis>

I discuss Charles Griswold’s Forgiveness, arguing that he classifies as marginal many cases that we normally count as forgiveness. Moreover the phenomenon that he calls “forgiveness at its best” may include some awful aspects of human nature. Nevertheless, there are central and important aspects of the concept that are captured by his discussion.     

Using the Good Behavior Game with High School Special Education Students: Comparing Student- and Teacher-Selected Reinforcers

The authors investigated the implementation of the Good Behavior Game (GBG) on disruptive behaviors of high school special education students. Additionally, the study compared the effect of student-selected rewards versus teacher-selected rewards. A multielement withdrawal (A/[B?+?C]/A/[B?+?C]) design was used in the classroom to monitor behavior and compare the reward topography. Results suggested that the GBG decreased the frequency of disruptive behavior in both teams; however, there were no notable differences across reward type for either team. Effect sizes were reported using nonoverlap of all pairs. Nonoverlap of all pairs scores indicated moderate-to-large effects for the GBG, but small effects for reward topographies. Limitations and future directions are also discussed.