Nonspeech and speech processing skills in patients with aphasia and apraxia of speech

Nonspeech and speech auditory processing skills as well as internal speech processing skills were assessed among four patients with acquired "pure" apraxia of speech, 10 with acquired aphasia, 10 with aphasia plus apraxia of speech, and 11 neurologically normal adults. Fourteen tasks were administered and performances on 68 variables were examined using both nonparametric and parametric analyses controlling for the effects of advancing age and associated hearing loss. In all cases, the "pure" apractic patients performed as normal subjects. Few differences were noted among the performances of the aphasic and aphasic-apractic subjects. Results led to three major conclusions: (1) apraxia of speech is a disorder distinct from aphasia; (2) aphasic individuals, despite locus of lesion, demonstrate disabilities for processing nonspeech and speech materials presented auditorily and for analytically evaluating speech evoked internally; and (3) aphasic individuals demonstrating similar severity levels of language impairment show similar performance patterns for these types of processing tasks, despite locus of lesion or coexistence of apraxia of speech.     

Perceiving choice and constraint: the effects of contextual and behavioral cues on attitude attribution

We examined how features of the situation and the target's behavior in the attitude-attribution paradigm may lead observers to infer that the behavior was performed purposefully and how these perceptions may contribute to correspondence bias. Experiment 1 demonstrated that cues suggesting that essay assignment resulted from the target's purposeful action lead to correspondent inferences. When these cues were absent, observers' inferences were not correspondent. Experiment 2 demonstrated that observers are sensitive to cues emitted by the target (facial expressions of delight and disappointment) and that those cues' meaning depends on the context in which they take place. When the essay was freely chosen, the expression had little effect; observers judged that the essay accurately reflected the target's attitudes. When the essay assignment was constrained, observers used the expressions to discount the essay when judging the target's attitudes. We discuss the implications of these findings for the study of correspondent inferences and correspondence bias.     

Influence of marihuana on storage and retrieval processe in memory

Following presentation and immediate free recall testing of 10 20-word lists, 48 Ss were divided into two groups, one of which received an oral dose of marihuana extract calibrated to 20 mg of Δ¹-THC and one of which received placebo. One hour later, all Ss were administered delayed recall, recognition, and order tests on the first set of words. Presentation of another set of 10 lists followed, and there were immediate recall and delayed recall, recognition, and order tests on these words. Performance of drug and placebo Ss did not differ significantly for any of the first delayed tests. However, the performance of drug Ss was poorer than that of placebo Ss on immediate recall, delayed recall, and delayed recognition of the second set of lists. We concluded that retrieval of information relevant to the occurrence or nonocurrence of an event was not affected by marihuana intoxication. Storage difficulties probably account for memory deficits due to the drug, and these difficulties appear to occur in the process of transferring information from short-term to long-term memory.     

A mathematical model for social influences on perceptual judgments

A mathematical model based upon signal detection theory is developed that characterizes social influences upon judgments of a stimulus. A social influence cue and the physical aspects of the stimulus were assumed to have independent effects upon performance. A visual movement discrimination task was employed in which subjects could make their judgment either before or after a cue that they had been led to believe was the response of another subject. The accuracy of this “response” was varied. The model provided a good account of the data. A model-based estimate of the magnitude of the influence effect indicated that this effect was greater when the “other” was highly accurate. The model provided an interpretation of social influences on perceptual judgments in which influence pressures have their effects only when subjects' sensory impressions are ambiguous.     

Crowded minds: the implicit bystander effect

Five studies merged the priming methodology with the bystander apathy literature and demonstrate how merely priming a social context at Time 1 leads to less helping behavior on a subsequent, completely unrelated task at Time 2. In Study 1, participants who imagined being with a group at Time 1 pledged significantly fewer dollars on a charity-giving measure at Time 2 than did those who imagined being alone with one other person. Studies 2-5 build converging evidence with hypothetical and real helping behavior measures and demonstrate that participants who imagine the presence of others show facilitation to words associated with unaccountable on a lexical decision task. Implications for social group research and the priming methodology are discussed.     

How Television News Viewers Deal with Facts that Contradict Their Beliefs: A Consistency and Attribution Analysis1

This study was conducted to investigate the effect of a counterattitudinal news story on the perceived credibility of a television newscaster. In the basic 2 × 2 design, subjects, who were either pro-student or pro-police, viewed a newscast in which either students or police were blamed for initiating a violent confrontation. The results indicated that subjects, for whom the newscast's conclusion was counterattitudinal (as compared to those for whom the conclusion was consistent with initial student-police attitudes), rated the newscast as less objective, rated the newscaster as less credible and more intending to persuade, and attributed to the newscast and newscaster more extreme political positions consistent with the newscast's conclusions The implications of these results for the problem of newscaster credibility are discussed, as are the connections between the present results and previous research on communicator credibility.