Learning of a complex arithmetic skill in amnesia: evidence for a dissociation between compilation and production

Two patients with severe amnesia following rupture of anterior communicating artery aneurysms were able to learn a complex algorithm for mentally squaring two-digit numbers. Although both patients learned the algorithm at a similar rate, one patient's improvement was accounted for by savings in the steps of the algorithm. The other patient, however, showed little improvement in the steps while performance of the whole algorithm improved dramatically. Neither patient showed savings in the Hebb Digit Span procedure. The results suggested a dissociation between amnesics in their capacity to learn the constituent "productions" or steps of a skill and their capacity to organize those productions into a single coherent act.     

Use of the maximal-operant principle to motivate children's intrinsic interest

The present research examined the hypothesis that in contrast to theory and research indicating that tangible reward decreases subsequent interest in enjoyable academic activities, rewards are perceived by adults as effective techniques to maximize long- and short-term subsequent interest for academic tasks of both high and low initial interest level. The results of our first three studies demonstrated that college students and parents view tangible reward as more effective than other less controlling techniques to enhance intrinsic motivation and value rewards more for intrinsically interesting academic behaviors in comparison with others (e.g., prosocial behaviors). Our fourth study supported the hypothesis that adults do not subscribe to the minimal-sufficiency analysis of increasing intrinsic motivation but prefer a maximal-operant principle in which the likelihood of producing long-term interest in academic tasks is assumed to vary positively with the size of a reward. Our fifth and sixth studies investigated illusory correlation as one mechanism that may perpetuate beliefs about the assumed positive relation between tangible reward and intrinsic interest in academic tasks.     

Maintenance of responding by squirrel monkeys under a concurrent shock-postponement, fixed-interval shock-presentation schedule.

A chain-pulling response was initially developed under a shock-postponement (avoidance) schedule with two squirrel monkeys. Few responses occurred on a lever where responding initially had no scheduled consequence or, subsequently, when a 3-minute fixed-interval shock-presentation schedule was concurrently arranged for lever responses. Appropriate rates and patterns of lever responding developed and were later maintained under the fixed-interval 3-minute shock-presentation schedule alone when the chain and shock-postponement schedule were removed. When both the shock-postponement and shock-presentation schedules were again simultaneously in effect, steady rates of chain pulling were maintained by the shock-postponement schedule and positively accelerated rates and patterns were maintained on the lever by the shock-presentation schedule. Response rates under both schedules were directly related to shock intensity. A history of exposure to a shock-postponement schedule, even though with a topographically different response and manipulandum, was sufficient for the development and eventual maintenance of responding by the presentation of shock. Further, differential performances can be maintained simultaneously by the presentation and postponement of electric shock.     

Neurochemical changes correlated with behavior maintained under fixed-interval and fixed-ratio schedules of reinforcement.

Key pecking of 4 pigeons was maintained under a multiple 3-min fixed-interval, 30-response fixed-ratio schedule of food presentation. Only one schedule was in effect during an experimental session, and each was correlated with a different keylight stimulus and location (left vs. right). The different schedule components alternated across days or weeks. Cerebrospinal fluid was collected from chronically implanted intracerebroventricular cannulae following sessions with the different schedules, as well as following sessions in which reinforcement was withheld (extinction), when response-independent food was delivered, and when the experimental chamber was dark and there were no scheduled events. Metabolites of the neurotransmitters serotonin, norepinephrine, and dopamine were assayed in cerebrospinal fluid using high-performance liquid chromatography with electrochemical detection. Compared to the fixed-ratio condition, responding maintained under the fixed-interval schedule resulted in consistently higher levels of the serotonin metabolite 5-hydroxyindoleacetic acid and of the dopamine metabolite homovanillic acid in all pigeons. Levels of 3-methoxy-4-hydroxyphenylethylene glycol, a metabolite of norepinephrine, and dihydroxyphenylacetic acid, another dopamine metabolite, were also higher in 3 of the 4 pigeons following exposure to the fixed-interval schedules when compared to levels of these metabolites after exposure to the fixed-ratio schedule. Extinction of fixed-ratio responding resulted in large increases in 5-hydroxyindoleacetic acid compared to levels of this metabolite under the fixed-ratio schedule, whereas this serotonin metabolite decreased during extinction of responding under the fixed-interval schedule. Control procedures suggested that the neurochemical changes were not related to the rate of responding but were a function of the specific experimental conditions. Distinctive neurochemical changes that accompany schedule-controlled responding show the sensitivity of the neurochemical environment to behavioral contingencies and demonstrate further the profound impact that such contingencies have on biobehavioral processes.     

Accuracy of drawing in a dual-task and resistance-to-distraction study: motor or attention deficit?

To determine whether manual incoordination is caused by attention deficit or not, we used an accuracy drawing task as a primary task in dual-task and resistance-to-distraction studies, and examined if thus measured attention could differentiate inattention (IA) and combined (CO) subtypes of ADHD. The secondary tasks and distractions failed to lower the primary task performance in IA, CO and control groups. We also compared the impairment scores of the accuracy drawing tasks from the Movement Assessment Battery for Children [Henderson, S. E., & Sugden, D. A. (1992). Movement assessment battery for children. London: Psychological Corporation.] between the groups with attention deficit hyperactivity disorder (ADHD) and/or developmental coordination disorder-inaccurate drawing type (DCD-ID). There were no group differences in the impairment score between the control and the ADHD groups, and between ADHD and ADHD plus DCD-ID groups. We concluded that inaccurate drawing is not caused by attention deficit, but that it is a manifestation of a motor deficit as a separate entity from attention deficit.     

Can manipulations of cognitive load be used to test evolutionary hypotheses?

D. DeSteno, M. Y. Bartlett, J. Braverman, and P. Salovey proposed that if sex-differentiated responses to infidelity are evolved, then they should be automatic, and therefore cognitive load should not attenuate them. DeSteno et al. found smaller sex differences in response to sexual versus emotional infidelity among participants under cognitive load, an effect interpreted as evidence against the evolutionary hypothesis. This logic is faulty. Cognitive load probably affects mechanisms involved in simulating infidelity experiences, thus seriously challenging the usefulness of cognitive load manipulations in testing hypotheses involving simulation. The method also entails the assumption that evolved jealousy mechanisms are necessarily automatic, an assumption not supported by theory or evidence. Regardless of how the jealousy debate is eventually settled, cognitive load manipulations cannot rule out the operation of evolved mechanisms.     

What if there were no psychometrics?: constructs, complexity, and measurement

McGrath (2005/this issue) has published a very significant article; it is significant because it examines the substantive issue of construct validity in a simple and informative way, noting the confusions apparent in how constructs and their variables are defined, used, and interpreted within the domain of personality and individual differences. This is a careful, thoughtful, article that quietly proceeds to outline the problems with current thinking and approaches to defining and using constructs in psychology. McGrath also suggests how some of these problems might be addressed. I note that McGrath appears to miss what might be considered an obvious rejoinder to some of his arguments, that is, the use of latent variable and item response theory. Some consideration is given to these arguments. However, a cursory examination shows that although these new methodologies offer many opportunities for new stochastic questionnaire data modeling and the construction of "instant" latent variables, the same problems caused by lack of attention to measurement and meaning remain. I find I am in agreement with many of the author's views and arguments, but I also find myself wondering whether modern psychometrics and individual differences research methods is now so dominated by psychological statisticians that any thought of substantive scientific innovation in this area that deals more properly with measurement and meaning is long gone. I think the answers to the question "What if there was no psychometrics?" would be most illuminating.     

Adventure and Atrophy in a Charismatic Movement: Returning to the 'Toronto Blessing'

In the summer of 1996, the author visited the source of the 'Toronto Blessing', spending many hours and several days at meetings of the Toronto Airport Christian Fellowship and talking with adherents and participants. Conducting ethnographic research through the lens of pilgrimage, the study explored the work of the fellowship and assessed its popularity within the context of contemporary revivalism. The study was published (Percy, "Morphology") and concentrated on the distinctive romantic grammar of assent that formed the theological construction of reality for participants. The article concluded with the observation that the 'success' of the fellowship was likely to be short-lived. In the autumn of 2002, the author returned to the fellowship to conduct further research and specifically to examine the nature of atrophy in a charismatic movement. After the millennium and with many failed predictions of global revival, how did the fellowship cope with its own declining numbers and a withering international support-base, with its unfulfilled hopes, and with the non-reification of its visions? Using the theoretical framework of James Hopewell (drawn from the field of Congregational Studies), the research suggests that this charismatic fellowship persists in being adaptive, in spite of the obvious loss of its popularity and influence, continuing to offer a viable spiritual resource within global revivalism that emphasises the importance of romantic (spiritual) adventure.     

Adolescent Adjustment to Perceived Marital Conflict

The cognitive-contextual framework of Grych and Fincham (1990) and the emotional-security framework of Davies and Cummings (1994) were used to explore both the direct and indirect pathways between marital conflict and adolescent adjustment. Two hundred and three non-clinic adolescents (114 females and 89 males) from intact families completed self-report questionnaires concerning their adjustment behavior, perceptions of parental conflict, and attachment to parents and peers. Marital conflict was found to have a direct effect upon adolescent adjustment, with adolescents from high-conflict homes displaying greater adjustment difficulties. Indirect effects of conflict were evident through both the adolescents' cognitive appraisals of conflict, and the adolescents' perceptions of the parent-child relationship. Differential gender effects were obtained, highlighting the importance of adolescent gender as a mediating variable. These findings were used to propose that an integrated, cognitive-emotional framework might be necessary to fully understand the conflict/adjustment relationship.     

Conceptualizing a Nonnatural Entity: Anthropomorphism in God Concepts

We investigate the problem of how nonnatural entities are represented by examining university students’ concepts of God, both professed theological beliefs and concepts used in comprehension of narratives. In three story processing tasks, subjects often used an anthropomorphic God concept that is inconsistent with stated theological beliefs; and drastically distorted the narratives without any awareness of doing so. By heightening subjects’ awareness of their theological beliefs, we were able to manipulate the degree of anthropomorphization. This tendency to anthropomorphize may be generalizable to other agents. God (and possibly other agents) is unintentionally anthropomorphized in some contexts, perhaps as a means of representing poorly understood nonnatural entities.