The acquisition of behavioral chains

The present investigation was designed to study some conditions which facilitate the acquisition of behavioral chains by young children. Three experiments were performed. In Expt I subjects were required to respond overtly to the internal components of the chain. In Expt II an aversive contingency was imposed following errors. In Expt III instructions were added at the beginning of training. The results supported the following conclusions: (a) Requiring subjects to mark and name the correct stimuli on each trial increased the accuracy of performance; (b) introducing time-out contingent on incorrect responses depressed the error rate; and (c) adding instructions concerning a pending change in the experimental task resulted in a lower error rate following withdrawal of the instructional stimuli.     

Reward schedule effects in extinction: Intertrial interval, memory, and memory retrieval

Rats were trained in a runway such that partial reward occurred on Trial 1 of the day and consistent reward on subsequent massed trials (Group PRT1), or consistent reward occurred on Trial 1 of the day and partial reward on subsequent massed trials (Group PRTM). Under spaced (24-hr) extinction, Group PRT1 was more resistant to extinction than Group PRTM and under massed (1-min) extinction, Group PRTM was more resistant to extinction than Group PRT1. These findings suggest that (a) distinctive stimuli are associated with Trial 1 of the day and with subsequent massed trials, (b) these distinctive stimuli function as retrieval cues for memories, memory retrieval being independent of intertrial interval, and (c) behavior in extinction is controlled by a stimulus compound consisting of the memory of nonreward plus stimuli which accompany the memory of nonreward on rewarded acquisition trials.     

Partial reward training level and reward magnitude: Effects on acquisition and extinction

Two groups of 10 rats each received either a large magnitude (0.90 g) or a small magnitude (0.18 g) of partial reward (PR) and seven successive acquisition-extinction sessions in the runway. The large magnitude PR group ran much faster than the small magnitude PR group in the early acquisition sessions with differences between the groups declining over sessions. In the early extinction sessions, the large magnitude PR group showed greater resistance to extinction than the small magnitude PR group, but in the late extinction sessions this relation reversed itself. Finally, resistance to extinction decreased over sessions, this decrease being greater under a large than under a small magnitude of PR.     

Reciprocal inhibition of a laboratory conditioned fear

Electric shock was used to establish a conditioned fear in 48 college Ss, who then received either deep muscle relaxation training, cognitive relaxation training or anxiety relief conditioning. Relaxation was conditioned to a slide of the word NOW and the aversive stimulus was a pure red slide. The compound stimulus NOW on a red background was presented to generate counterconditioning, followed by a re-presentation of pure red as a measure of transfer. GSR and Blood Volume Pulse were recorded for evaluation of the fear reduction generated by each training procedure. All group differences were non-significant. The two relaxation procedures were equally effective, while the Anxiety Relief group manifested consistently smaller response-reduction. Implications and the usefulness of the paradigm were discussed.     

Imitative play behavior of children: The importance of model distinctiveness and prior imitative training

The frequency of play behaviors of nursery school and second grade subjects (N = 116) who were imitative of one of two models depended upon the extent to which the two models were previously distinguished by the proportion of reinforcement each delivered, and whether reinforcement delivery was contingent upon imitative behavior. A model, high in distinctiveness and also involved in prior imitative training, engendered reliably more imitations than models high (or low) in distinctiveness but involved in nonimitative (or imitative) training.     

Generalized imitative affection: Relationship to prior kinds of imitation training

Two experiments utilizing first- and second-grade Canadian children showed that generalized imitative physical affection was most facilitated by prior imitative physical contact training (as opposed to verbal contact training) when the object of the affection was either a toy teddy bear, Experiment I, or an adult human, Experiment II.Additional findings from Experiment I showed that generalized imitative physical aggression was equally facilitated by imitative physical contact training and that punishment, as well as extinction operations applied to training imitations, resulted in suppression of all generalized imitations with no differential effect of punishment on affection or aggression being noted.The lack of any persisting imitations in a control group in Experiment II, which received noncontingent reinforcement but instructional prompting for training imitations, suggested that instructional control of imitation responses was initially weak and that the contingency between reinforcement and training imitations was critical for continued occurrence of training imitations and any occurrence of generalized physical affection imitations.     

The developmental relationship between identity and equivalence conservation

Hooper's (1969a) finding that identity conservation develops prior to equivalence conservation was investigated using a more stringent within-subject design. Seventy-two kindergarten, first, and second graders were given three conservation tasks: (1) Identity, (2) Equivalence 1, in which the perceptual cues were comparable to those in Identity, and (3) Equivalence 2, the traditional Piagetian conservation task. Each task was administered under two levels of transformation. No significant differences in performance as a function of level of transformation, type of equivalence task, or sex of S were found, but first and second grade Ss performed better than kindergarten Ss. Eighty-six percent of the sample conserved in an all-or-none fashion, and 7 Ss (10%) passed equivalence while failing identity, thus contradicting the developmental priority of identity conservation.     

Evaluation as a function of correspondence and hedonic relevance

An experiment was conducted to test and refine some of the implications of Jones and Davis' (1965) model of the attribution process in person perception. Subjects read anecdotes about actors who performed either in-role (low correspondence) or out-of-role (high correspondence) behaviors which were positive, negative, or neutral in the subject's estimation (hedonic relevance). Respect and admiration for the actor were influenced by both hedonic relevance and correspondence (did the action reflect an inner attribute?), but liking and friendship were affected by hedonic relevance only. The implications for the evaluation process in person perception were discussed.     

Stimulus information and primate discrimination learning: The influence of postresponse stimulus information

This paper describes an experiment concerned with the operation of discriminatory processes subsequent to an individual's overt choice response and how these may be affected by extrinsic stimulus information. The experiment used subhuman primates and was conducted within the simultaneous two-choice visual discrimination paradigm. The major results of the experiment indicated that: (1) learning performance may be significantly interfered with by irrelevant postresponse stimulus information, and (2) this interference is primarily associated with the presentation of irrelevant information subsequent to nonreinforced choice responses. The results are discussed in terms of the relation between the occurrence of reinforcement and the operation of memory storage processes.     

The modification of racial bias in preschool children

In previous studies using the Preschool Racial Attitude Measure (PRAM) and other measurement procedures, preschool children have displayed a tendency to evaluate light-skinned (Euro-American) persons more positively than dark-skinned (Afro-American) persons. Both Euro- and Afro-American children demonstrate this pro-Euro/anti-Afro ($\text{E+}\text{A?}$) bias, though it is less pronounced among Afro children.Two experiments designed to modify this racial bias are reported. The first study involved 39 Euro- and Afro-American preschool children and employed operant learning principles to modify $\text{E+}\text{A?}$ bias via a teaching machine procedure which provided reinforcement for pro-Afro/anti-Euro responses. Following training, the children showed a reduction in $\text{E+}\text{A?}$ bias on a test procedure not associated with the training. Follow-up testing of 30 of the children approximately 1 yr after the posttest revealed a tendency for the pro-Euro bias to be partially reestablished. The second study involved 70 Euro-American kindergarten children and was concerned with the modification of $\text{E+}\text{A?}$ bias via a classroom curriculum procedure and the possible influence of the race of the teacher associated with the curriculum. The experimental curriculum, designed to develop positive associations to dark-skinned persons and to the colors black and brown, was shown to have no effect on $\text{E+}\text{A?}$ bias, nor was race of teacher a variable of significance. Possible explantations for the findings of both experiments were discussed.