Teaching autistic children to respond to simultaneous multiple cues

A number of studies have shown that autistic children tend to learn new discriminations by responding to only a restricted number of available cues and that this may be responsible for some of their abnormal behavior. Therefore, this investigation assessed the feasibility of teaching autistic children to respond to multiple cues. The results showed that four autistic children could learn a conditional discrimination requiring them to discriminate a multiple-cue complex from each of its two component cues. However, the autistic children did not learn this discrimination in the same manner as normal children. In the early trials, the autistics responded at a higher level to one of the two component cues. Only after many trials did the autistics respond equally on the basis of both component cues. The results of an initial attempt to teach a general set to respond to multiple cues showed that, when an autistic child was taught a series of successive conditional discriminations, the child eventually learned a set to approach new discriminations by responding equally on the basis of both component cues. The results are discussed in terms of understanding and treating autistic children's abnormal development.     

Associations in Pavlovian conditioned inhibition

Two experiments with rat subjects used a variety of transfer tests to examine the associations learned when Pavlovian inhibition is established by an A+, AX− paradigm. Experiment 1 found in a conditioned suppression situation that inhibition conditioned to X with one exciter (A) readily transferred to another exciter (B) which had been paired with the same shock US. Transfer occurred even when the response to A had been extinguished prior to testing with B. However, X did not inhibit a general activity response produced by a B which had been subsequently paired with a food US. Experiment 2 employed a Pavlovian conditioning situation in which A and B, when separately paired with the same food US, evoked dissimilar responses. Nevertheless, an inhibitor trained in an A+, AX− paradigm successfully inhibited the different response evoked by B. However, such an X did not inhibit the behaviors acquired by A or B when they were subsequently paired with a shock US. The transfer of Pavlovian inhibition across conditioned stimuli and responses but not across unconditioned stimuli is consistent with the notion that a conditioned inhibitor acts to prevent activation of a US representation which would normally be activated by conditioned exciters.     

Mental comparison and the symbolic distance effect

The time required to compare two symbols varies inversely with the distance between their referents on the judged dimension. Evidence for this phenomenon, here called the symbolic distance effect, is reviewed, and the paper describes a new experiment designed to clarify the nature of the effective “distance” by disentangling ordinal and interval distances between the referents of compared symbols. The data show that doubling the size difference between two circles speeds comparison of their names, even when ordinal distance between the circles is held constant. Several explanations of the mental processes involved in such memory comparisons are then critically evaluated, and a “scan plus comparison” model is tentatively adopted.     

Fear as a discriminative stimulus for an appetitive instrumental response

Two experiments tested the hypothesis that anticipation of shock could be established as a discriminative stimulus for an appetitive instrumental response. In multiphase experiments, bar pressing for food was brought under the discriminative control of intermittent and gradually increasing electric shock. In a second phase, tones were estalished as either a CS+, or CS? for shock. Subsequently, the CSs were introduced on to the operant baseline. Animals trained with shock as the S^D showed an increase in responding to the CS+ and a slight decrease to the CS?. Conversely, animals trained with shock as the S^Δ showed decreased responding to the CS+ and slight increase to the CS?. These findings are seen as supportive of the Discriminative Stimulus hypothesis of learned resistance to punishment.     

The influence of symbolic and motor rehearsal in observational learning

The experiment investigated the effects of the mode and patterning of rehearsal on the acquisition and retention of modeled activities varying in organizational complexity. Subjects observed a filmed model construct two configurations, containing high or low organizational requirements. Immediately after exposure they rehearsed the modeled activities either mentally, motorically, mentally and then motorically, motorically and then mentally, or engaged in a distracting activity that prevented rehearsal of what they had see. Performance tests were conducted immediately after the rehearsal phase and again 1 week later. Subjects who rehearsed the modeled behaviors symbolically, whether singly or in conjunction with motor practice, reproduced both configurations more accurately than those who rehearsed motorically or not at all. Motor rehearsal increased speed on the organizationally simple task, but did not enhance response acquisition over and above observation alone. The overall results are interpreted as supporting the social learning view that modeled behaviors are best acquired when demonstrated activities are first organized symbolically and then refined on the basis of performance feedback.     

SVIB revisions and factors affecting scale reliability

The 1966 SVIB scoring keys were investigated and found to contain an average of 214 fewer items per occupational scale than the 1938 scoring keys. The shorter scales are less reliable than the longer scales on the 1966 SVIB. The shorter scales in the 1966 edition and SCII contain items which differentiate criterion group members less well than do the longer scales. There may not be a wide enough range of item content on the SCII to develop reliable (and valid?) scales for certain occupations. Equivalence between the 1938 and 1966 editions functionally is low, as evidenced by the median correlation of .47 in the present 12-yr follow-up study for 40 occupational scales.     

A triarchic theory of intellectual development during adulthood

A triarchic theory of intellectual development during adulthood is proposed. The theory comprises three parts: a contextual part that emphasizes the role of intelligence in successful adaptation to the environment; a componential part that specifies the mental mechanisms and processes underlying intelligent behavior; and an experiential part that indicates that intelligence is best manifested in instances in which the task or situation requiring the application of these processes is relatively novel or is becoming automatized. A selective and brief review of the literature on adult intellectual development is provided as evidence for the triarchic theory. The triarchic theory is then compared with four other theoretical approaches to adult intellectual development. It is argued that the triarchic theory provides new insights regarding the ways in which intelligence changes from early to middle to late adulthood and suggests certain properties of tasks and situations that make them more or less useful as measures of intelligence at various points in adult intellectual development.     

Blocking and unblocking of conditioned analgesia

Two experiments with rat subjects assessed the blocking phenomenon using inhibition of responding to painful thermal stimulation as an index of conditioned analgesia established through conditioned stimulus (CS)-shock pairings. In Experiment 1, a group of rats receiving the standard blocking procedure ($\text{A+}\text{AB+}$) showed shorter response latencies during a hot plate test of pain sensitivity in the presence of the added CS than groups of rats receiving various blocking control procedures. Experiment 2 replicated the blocking outcome of Experiment 1 and also demonstrated that the addition of a second shock unconditioned stimulus (US) during the compound conditioning phase attenuated the blocking effect; i.e., unblocking was observed. However, the deletion of a second shock US during compound conditioning in a group that had received two shocks on each trial in the first phase of the experiment failed to result in unblocking. These data extend the associative account of conditioned analgesia to situations involving stimulus selection and the implications for the analysis of aversive learning are discussed.     

Conservation learning and the differential impact of visual information available during and after modeling

In order to investigate the nature of the processes that promote the observational learning of conservation, nonconservers were allowed or not visual access to the conservation stimuli while an adult model verbalized the conservation rule. In addition, after each demonstration the subjects were submitted to one of four conditions. The first three conditions involved a short pause during which the observers respectively kept seeing the stimuli, had to visualize them mentally, and had to visualize mentally some irrelevant stimuli; no interruption occurred in the fourth condition. As predicted, the withdrawal of visual information at the time of rule exemplification was accompanied with lower learning scores. However, equivalent acquisition was found with respect to each of the conditions in which the subjects were invited to examine specific stimuli after rule modeling. Altogether these data were discussed in terms of the greater and lesser extent to which the conditions permitted the children, during the observational training, to practice covertly the modeled solution.