Hierarchical control of cognitive processes: switching tasks in sequences

Hierarchical control of cognitive processes was studied by examining the relationship between sequence- and task-level processing in the performance of explicit, memorized task sequences. In 4 experiments, switch costs in task-switching performance were perturbed by sequence initiation times that varied with sequence complexity, preparation time, and type of sequence transition (repetition or switch). Hierarchical control was inferred from these sequence initiation time effects and the recurrent finding of no switch cost at the first serial position across sequences, the point at which sequence-level processes are likely active in maintaining or instantiating a hierarchical control structure in working memory. These findings resonate with past research on motor programs and serial memory and provide new insights into the concepts of task set and control.     

Priming cue encoding by manipulating transition frequency in explicitly cued task switching

Explicitly cued task switching with multiple cues per task permits three types of transitions: cue repetitions (cue and task repeat), task repetitions (cue changes but task repeats), and task alternations (cue and task change). The difference between task alternations and task repetitions can be interpreted as a switch cost, but its magnitude varies substantially across experiments. We investigated how switch cost is affected by transition frequency (how often subjects repeat and switch tasks) with an experiment in which each transition had a frequency of .70 in separate sessions. Switch cost was smallest when task alternations were frequent and largest when task repetitions were frequent. Mathematical modeling of the data indicated that the different “switch costs” reflected priming of cue encoding for frequent transitions. Interpretations of our findings based on automatic priming from memory retrieval of past transitions and strategic priming from transition expectancies are discussed.     

Evaluating rate,accuracy, and fluency of young children's diadochokinetic productions: a preliminary investigation

Diadochokinetic (DDK) rates are commonly assessed in children with speech-language disorders, even though the implications of fast or slow DDK rates are not clear. This study explored the possibility that the accuracy and fluency of DDK productions may provide a meaningful supplement to traditional measures of DDK rate. Participants were 15 boys, age 3-7, with normal speech-language development, who were asked to produce "puh-tuh-kuh" or "pattycake" in a standard DDK task. Analyses revealed that normally developing children produce frequent articulation errors but few disfluencies during DDK tasks. Errors and disfluencies did not affect DDK rate, suggesting that the rate of DDKs may be a relatively insensitive measure of children's speaking abilities. Although an expected correlation was found between age and overall DDK rate, no correlations were found between age and the frequency of articulation errors or speech disfluencies. Findings suggest that measures of DDK accuracy and fluency may provide information about children's speech development that is independent of age and may be more closely related to oral motor development than rate. Overall, results underscore concerns with the interpretation of DDK rate and highlight ways that rate measures might be supplemented with measurement of accuracy and fluency in the evaluation of children's speaking abilities. EDUCATIONAL OBJECTIVES: The reader will learn about a technique that may facilitate the evaluation of young children's oral DDK abilities. The reader will learn about the frequency and type of errors children produce on DDKs and how this information can be used in the assessment of children's oral motor abilities.     

Women,sex, and HIV: social and contextual factors,meta-analysis of published interventions,and implications for practice and research

This article is focused on examining social and contextual factors related to HIV-risk behavior for women. Specifically, this article has three main purposes: to review the literature on selected social and contextual factors that contribute to the risk for the heterosexual transmission of HIV and AIDS, to review and conduct a meta-analysis of HIV-prevention interventions targeting adult heterosexual populations, and to suggest future directions for HIV-prevention intervention research and practice. Results suggest that the HIV-prevention interventions reviewed for this article had little impact on sexual risk behavior, that social and contextual factors are often minimally addressed, and that there was a large gap between research and the practice of HIV-prevention intervention.     

How two causes are different from one: The use of (un)conditional information in Simpson's paradox

In a causally complex world, two (or more) factors may simultaneously be potential causes of an effect. To evaluate the causal efficacy of a factor, the alternative factors must be controlled for (or conditionalized on). Subjects judged the causal strength of two potential causes of an effect that covaried with each other, thereby setting up a Simpson's paradox--a situation in which causal judgments should vary widely depending on whether or not they are conditionalized on the alternative potential cause. In Experiments 1 (table format) and 2 (trial-by-trial format), the subjects did conditionalize their judgments for one causal factor on a known alternative cause. The subjects also demonstrated that they knew what information was needed to properly make causal judgments when two potential causes are available. In Experiment 3 (trial-by-trial), those subjects who were not told about the causal mechanism by which the alternative cause operated were less likely to conditionalize on it. However, the more a subject recognized the covariation between the alternative cause and the effect, the more the subject conditionalized on it. Such behavior may arise from the interaction between bottom-up and top-down processing.     

Simon-type effects: chronometric evidence for keypress schemata in typewriting

In 4 experiments, chronometric evidence for keypress schemata in typing was sought by presenting stimuli to be typed in positions that were displaced from a central fixation point. Reaction times were shorter when stimulus positions corresponded to keyboard locations of the letters to be typed, suggesting that position was an important part of the internal representation of the response. Experiment 1 presented single letters left and right of fixation. Experiment 2 presented single letters above and below fixation. Experiment 3 presented words left and right of fixation and found evidence of parallel activation of keypress schemata. Experiment 4 found no effect of the eccentricity of the keyboard locations and responding fingers, suggesting that response-location codes are categorical, not metric. The results are consistent with D. E. Rumelhart and D. A. Norman's (1982) theory of typewriting.     

Rational-emotive therapy in the therapeutic community

Therapeutic Communities (TC's) have become increasingly popular in the treatment of substance abusing psychotherapy clients. Their popularity appears to have stemmed from the failures of traditional and more individual treatment modalities. Approaches focusing on immeasurable constructs and often irrelevant past events are argued to contribute to symptom maintenance and resistance in this client population. It is argued that a more direct, responsibility-oriented approach be implemented in a systematic and consistent fashion in order to facilitate treatment. The systematic application of Rational-Emotive Therapy in a self-contained therapeutic system is discussed.Raymond J. Yeager Ph.D., is Director of Psychological Services at A.P.P.L.E. Inc.: A Program Planned for Life Enrichment, a graduate fellow and staff therapist at the Institute for Rational-Emotive Therapy and is a privately practicing psychologist in Commack and Huntington, Long Island, N.Y.Raymond DiGiuseppe, Ph.D., is a Diplomate of the American Board of Professional Psychology, is the Director of Training and Research at the Institute for Rational-Emotive Therapy, is an Assistant Professor of psychology at St. John's University and is in private practice in Hempstead, L.I., N.Y.John T. Olsen is a certified substance abuse counselor at A.P.P.L.E. Inc. He is a graduate of APPLE'S residential program and has worked in the field of substance abuse treatment and prevention for over 11 yearsLogan Lewis ia the President and founder of APPLE Inc.Robert Alberti is the Program Director of APPLE's residential treatment program, and is a certified substance abuse conselor.