Hierarchical versus nonhierarchical models of movement sequence control: a reply to Klein

Klein (1983) has proposed a nonhierarchical logogen model to account for response timing and error data from a rapid finger-tapping task reported by Rosenbaum, Kenny, and Derr (1983). On grounds of parsimony, Klein's model cannot be easily distinguished from the hierarchical model proposed by Rosenbaum et al. However, the two models can be distinguished on other grounds. First, the logogen model cannot account for results from a second experiment reported in the Rosenbaum et al. article that the hierarchical model can account for. Second, the logogen model gives rise to a preponderence of incorrect response orders, whereas the hierarchical model does not. Third, the logogen model, unlike the hierarchical model, cannot account for the fact that people can produce complex, extended sequences of responses from memory.     

Hierarchical control of rapid movement sequences

Are movement sequences executed in a hierarchically controlled fashion? We first state explicitly what such control would entail, and we observe that if a movement sequence is planned hierarchically, that does not imply that its execution is hierarchical. To find evidence for hierarchically controlled execution, we require subjects to perform memorized sequences of finger responses like those used in playing the piano. The error data we obtain are consistent with a hierarchical planning as well as execution model, but the interresponse-time data provide strong support for a hierarchical execution model. We consider three alternatives to the hierarchical execution model and reject them. We also consider the implications of our results for the role of timing in motor programs, the characteristics of motor buffers, and the relations between memory for symbolic and motor information.     

Pavlovian extinction,phobias, and the limits of the cognitive paradigm

The slow or total lack of decrease in some autonomic responses during extinction in aversive conditioning and concomitant verbalizations of fear have remained a problem for learning theories and psychophysiology. Removal of the aversive stimulus should result in a rapid decrement in responding, as it does in cognitive and somatic systems. In laboratory analogues of phobia and clinical neurosis, however, such decreases do not occur in some autonomic responses and reported fear. In this article three areas of research are presented in which dissociations occur between cognitive and autonomie responses: 1) relational learning, 2) phobia, and 3) incubation. The data indicate that there are some important distinctions to be made concerning the properties of different psychological and physiological systems. These distinctions pertain to the differences between cognitive and noncognitive systems, between the two branches of the ANS, and between acquisition and extinction processes. These distinctions lead to a number of hypotheses concerning dissociations between response systems and have important implications for the understanding and treatment of neurosis.     

Cooperative education,career exploration,and occupational concepts for community college students

Super's self-concept theory of career development and Jordaan's construct of vocational exploratory behavior were used to investigate the outcomes of a college cooperative education program. The effects of an internship were compared with those of a classroom experience with regard to change in similarity between self- and occupational pictures (incorporation scores). A measure of incorporation was administered to 85 students who worked during one quarter, and 99 students who were enrolled in classes during the same period. Both groups increased in incorporation for prospective occupation (t = .01, p > .10). For the internship group no difference was found between increase in incorporation for first- and second-choice occupation (t = .24, p > .10), while for the classroom group the increase in incorporation for prospective occupation was significantly greater than for second-choice (t = 2.80, p < .01). This result was discussed in light of the implication that the internship stimulated vocational exploratory behavior. Roe's system of occupational classification revealed an unexpected lack of relationship between first- and second-choice occupations. These findings were discussed in relation to the career development of the working-class community college sample.     

Human movement initiation: specification of arm, direction, and extent

This article presents a method for discovering how the defining values of forthcoming body movements are specified. In experiments using this movement precuing technique, information is given about some, none, or all of the defining values of a movement that will be required when a reaction signal is presented. It is assumed that the reaction time (RT) reflects the time to specify those values that were not precued. With RTs for the same movements in different precue conditions, it is possible to make detailed inferences about the value specification process for each of the movements under study. The present experiments were concerned with the specification of the arm, direction, and extent (or distance) of aimed hand movements. In Experiment 1 it appeared that (a) specification times during RTs were longest for arm, shorter for direction, and shortest for extent, and (b) these values were specified serially but not in an invariant order. Experiment 2 suggested that the precuing effects obtained in Experiment 1 were not attributable to stimulus identification. Experiment 3 suggested that subjects in Experiment 1 did not use precues to prepare sets of possible movements from which the required movement was later selected. The model of value specification supported by the data is consistant with a distinctive-feature view, rather than a hierarchical view, of motor programming.     

A comparison of female and male adolescents' social behaviors and cognitions: A challenge to the assertiveness literature

Sex differences were investigated in the thoughts and behaviors of adolescents in simulated social situations. The pattern of sex differences indicated females to be more appropriately assertive in their overt behaviors than males. Males were more aggressive. In their cognitions females were more likely to deny their impact on others, while males were more likely to deny the impact of others on themselves. Potency training was suggested for females, assertiveness training for males. Cluster analyses of correlations among behaviors and thoughts revealed four clusters for females: external locus of control, internal locus of control, active expressiveness, and social isolation or denial. The three male clusters were a negative impotent one, a positive active cluster, and an aggressive hostile cluster.The research reported is based on a dissertation submitted in partial fulfillment of the requirements for a Ph.D., University of Toronto (OISE). The research was partially funded by OISE Research and Development Grant No. 3478, awarded to the second author.     

Reactivation-induced interference in a short-term retention paradigm

In Experiment 1 it was demonstrated that interference with a rat's retention of a target spatial cue decreases as the interval between prior conflicting cues and the target increases. Experiment 2 showed that interference can occur even when the interstimulus interval is long, if the memory of a conflicting cue is reactivated just prior to exposing an animal to the target cue. A third experiment suggested that these findings could not be easily interpreted in terms of a stimulus satiation effect. The implications of these findings for a trace decay model of short-term retention were discussed.     

ASSESS: Adjustment Scales for Sociometric Evaluation of Secondary-School Students

The Adjustment Scales for Sociometric Evaluation of Secondary-School Students (ASSESS) was designed to assess peer ratings of the behavior of male and female adolescents. Five scales were developed and crossvalidated: Aggression-Disruptiveness, Withdrawal, Anxiety, Social Competence, and Academic Difficulty. Evidence of adequate internal consistency and testretest reliability was presented. Evaluations by male and female classmates were highly correlated. Sex and age differences accounted for only a small proportion of the total variance.This research was supported by Grant MH-21145 from the National Institute of Mental Health and funds from W. T. Grant Foundation. We wish to acknowledge the assistance of Ronda Brooks, Lina Jandorf, and Jean Sullivan in conducting the data collection, as well as the many school districts that have cooperated.