Delay or rate of food delivery as determiners of response rate

Pigeons were confronted with two keys: a green food key and a white changeover key. Food became available for a peck to the green key after variable intervals of time (mean = 113 seconds). A single peck on the changeover key changed the color of the food key to red for a fixed period of time during which the timing of the variable-interval schedule in green was suspended and the switching option eliminated and after which the conditions associated with green were reinstated. In Experiment 1 a single food presentation was obtainable during each red-key period after a minimum delay timed from the switch. This delay and the duration of the red-key period were held constant during a condition but varied between conditions (delay = 2.5, 7.5, 15, or 30 seconds; red-period duration = 30, 60, 120, 240, or 480 seconds). In Experiment 2 additional food presentations were scheduled during a 240-second red-key period with the delay to the first food delivery held constant at 30 seconds, and the delays to later food deliveries varied over conditions. Considering the data from both experiments, the rate of switching to red was a decreasing function of the delay to the first food, the delay to the second food, and perhaps the delay to the third food after a switch. There was no clear evidence that the rate of food in the red-key period made an independent contribution. The ordering of response rates among conditions was consistent with the view that each food presentation after a response adds an incremental effect to the rate of the response and that each food presentation's contribution is a decreasing function of its delay timed from the response.     

Logic and Aggregation

Paraconsistent logic is an area of philosophical logic that has yet to find acceptance from a wider audience. The area remains, in a word, disreputable. In this essay, we try to reassure potential consumers that it is not necessary to become a radical in order to use paraconsistent logic. According to the radicals, the problem is the absurd classical account of contradiction: Classically inconsistent sets explode only because bourgeois classical semantics holds, in the face of overwhelming evidence to the contrary, that both A and A cannot simultaneously be true! We suggest (more modestly) that there is, at least sometimes, something else worth preserving, even in an inconsistent, unsatisfiable premise set. In this paper we present, in a new guise, a very general version of this preservationist approach to paraconsistency.     

A Clinical Intervention in Chronic Pain and Insomnia with a Combined Model of Treatment: A Test of Concept

Co-occurring chronic pain and insomnia are common in a clinical setting. Cognitive–behavioral theoretical (CBT) frameworks exist for both conditions independently. The purpose of this study was to address the problem of co-occurring chronic pain and insomnia with an integrated CBT model based on empirical support. One-hundred eleven individuals (age range 21–65 years) meeting the general criteria for chronic pain and insomnia were included in this study. Participants completed a demographic form, the Dysfunctional Beliefs and Attitudes about Sleep—16-item version, Insomnia Severity Index, Sleep Hygiene Index, Sleep Associated Monitoring Index, Pain Catastrophizing Scale, Pain Disability Questionnaire, Modified Somatic Perceptions Questionnaire, Hospital Anxiety and Depression Scale, and Multidimensional Scale of Perceived Social Support. Significant positive bivariate relationships were observed for pain catastrophizing (PC) and dysfunctional beliefs and attitudes about sleep (DBAS), as well as somatic awareness and sleep-associated monitoring. Two backward stepwise regression models were utilized to determine a model for predicting insomnia severity and pain disability respectively using a combination of sleep and pain-associated measures. Insomnia severity was predicted by DBAS, PC, and somatic awareness. Pain disability was predicted by PC, DBAS, depression, and social support. Maladaptive thought patterns related to pain and insomnia and associated features appear to have a synergistic effect on both insomnia severity and pain disability and support a combined cognitive–behavioral model.     

Habituation in high‐risk infants: reliability and patterns of responding

We examined both the reliability of infant‐controlled habituation and patterns of responding in a group of high‐risk infants (mean age 16 mos). Good test–retest reliability was found for mean, total, and baseline looking time for one of the stimuli. Classification of infants' pattern of performance yielded two groups: linear (57%) and non‐linear (29%) responders; 14% of cases could not be classified because of cross‐session inconsistencies in performance. Linear responders had shorter total looking times, fewer trials to criterion, and showed more habituation than non‐linear responders, thus validating the linear/non‐linear distinction. Our findings indicate that the infant‐controlled habituation task can be used reliably with infants who are at high risk for developmental disorders. Indeed, we provide evidence that this task is not only reliable, but may also provide meaningful distinctions between infants within the high‐risk population. Discussion focuses on the role of attention in distinguishing between short (linear) and long (non‐linear) lookers. Copyright © 2003 John Wiley & Sons, Ltd.     

Attention to errors and learning: Across-task and across-domain analysis of the postfailure reflectivity measure

The ratio between the mean postfailure and postsuccess latencies on a self-paced task (Postfailure Reflectivity) has been proposed as a measure of attention to errors, affecting learning across domains. This study was devised to test the generality of Postfailure Reflectivity (PFR). In Experiment 1, performance on two nonverbal, inference, and induction/deduction tasks was examined. Reading disabled subjects showed significantly less PFR than normally achieving subjects, and PFR correlated positively with the score in two nonverbal tasks, and across two testing times. In Experiment 2, PFR was significantly correlated with performance on two nonverbal tasks and one arithmetic task, and with measures of deep planning during interviews following the learning of a nonverbal inference task, as well as following motor and cognitive learning tasks. PFR also correlated with intentional learning, as measured on the Implicit Theories Interview. Jointly considered, these findings support the view that attention to errors plays a central role in learning, and that PFR is a good measure of attention to errors. It appears that Postfailure Reflectivity is a metacognitive skill which possesses adaptive, generalized, and trans-domain characteristics.