Publications by authors named "Amin Lotfizadeh"

The phenomenon of extinction-induced resurgence is well established, but there is comparatively little experimental evidence for punishment-induced resurgence. Punishment-induced resurgence can by tested by contingent shocks following the alternative response. The purpose of Experiment 1 was to test whether low-intensity shocks, that do not decrease rate of reinforcement, result in resurgence.

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Behavior analysts frequently use the Verbal Behavior Milestones Assessment and Placement Program (VB-MAPP) to assess the language and social skills of children with autism in everyday practice and in research. Despite the widespread use of the VB-MAPP, its psychometric characteristics have not been extensively investigated. To provide information about its convergent validity, we calculated correlations between scores earned by 235 children with autism on the VB-MAPP and the Vineland Adaptive Behavior Scale (VABS), a commonly used assessment with good reliability and validity.

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Objective: The purpose of this study was to assess satisfaction with telehealth interventions for a large nonprofit organization that transitioned interventions for individuals with autism spectrum disorder (ASD) to telehealth during a pandemic. Services provided via telehealth included applied behavior analysis (ABA), speech and language, and occupational therapies. A secondary survey evaluated reasons for declining telehealth services.

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During the COVID-19 pandemic, in-person classroom instruction was placed on hold and university courses transitioned to online instruction. This transition resulted in novel challenges for instructors, including reduced professor-student interactions due to limited student webcam usage. The purpose of this study was to assess the impact of a reinforcement contingency on students' use of webcams during synchronous online instruction.

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Resurgence refers to a behavioral process in which a recent response is extinguished (or reinforcement conditions worsen) and a previously extinguished response recurs. In previous research, resurgence has been reliably produced when the resurgence procedure is repeated. Changes in the degree of increase of the resurging response across iterations of the procedure have been inconsistent, however, with some studies showing increases and some showing no changes or decreases in resurgence magnitude.

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Children with autism achieve improved behavioral outcomes with applied behavior analytic (ABA) interventions. Typically, ABA is delivered in a participant's home or in a clinic setting. At the onset of COVID-19, treatment in these environments was not available due to health exposure concerns.

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The motivating operations concept has been of considerable interest and practical value to behavior analysts, including practitioners. Nonetheless, the concept has generated substantial controversy and has significant limitations. To address some of these limitations, we suggest that it would be wise to redefine motivating operations, to deemphasize the importance that has historically been placed on subtypes of conditioned motivating operations, to emphasize how motivating operations and discriminative stimuli interact, and to further examine the kinds of environmental changes that alter the reinforcing value of particular kinds of stimuli.

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The motivating operations concept has generated substantial conceptual analysis and research interest. Following an analysis of how motivating operations affect behavior, one which emphasizes the interactive role of motivating operations and discriminative stimuli, we propose: a) redefining motivating operations as operations that modulate the reinforcing or punishing effectiveness of particular kinds of events and the control of behavior by discriminative stimuli historically relevant to those events, b) dropping the distinction between behavior-altering and function-altering effects of motivating operations, and c) reducing or eliminating emphasis on conditioned motivating operations. This reconceptualization of the motivating operations concept is intended to increase its value in predicting and gainfully changing behavior.

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We determined inter-rater agreement for the VB-MAPP, an instrument sometimes used in planning educational goals and evaluating intervention effects for young people with autism. A pair of raters independently rated each of 32 children diagnosed with autism. Intraclass correlation coefficients for the total Milestones and Barrier scores were 0.

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We compared clinical outcomes in a treatment group of 98 individuals who received between 8 and 15 weekly hours ( = 10.6; = 1.7) of applied behavior analysis (ABA) intervention with a comparison group of 73 individuals who received another provision, including some ABA, (between 1.

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Several studies using non-pharmacological discriminative stimuli have found that stimulus control, as evident in generalization gradients, changes when motivation for (i.e., deprivation of) the relevant reinforcer is altered.

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Previous studies have shown that altering motivation typically affects stimulus generalization in animals trained to discriminate exteroceptive stimuli, but few studies have evaluated the effects of manipulating motivation on drug stimuli. In the few published studies, motivation levels were manipulated by arranging different feeding conditions prior to stimulus generalization tests with rats trained to discriminate morphine from vehicle and in pigeons trained to discriminate phencyclidine or pentobarbital from vehicle. In the present study, rats maintained at 80% of free-feeding weights were trained to discriminate between injections of 1.

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Several recent studies have explored what Michael (e.g., 1982) termed the value-altering effect and the behavior-altering effect of motivating operations.

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