Contiguity and contingency in the acquisition and maintenance of an operant

Three experiments compared the effects of nondifferential and differential reinforcement of response location on a circular dimension. Rats were required to operate a vertical joystick to produce food. When food was delivered immediately after responses, but independent of response location, the spatial concentration of responding was low and no progressive changes were observed. Traditional and percentile schedules of differential reinforcement for response location produced highly reliable acquisition of spatially concentrated responding. Once concentrated responding had been established, nondifferential reinforcement was sufficient to maintain it in some subjects. Since only the differential reinforcement schedules established a contingency with respect to response location, it was concluded that this relationship was necessary for acquisition, but that response-reinforcer contiguity may be sufficient for maintenance. This conclusion is consistent with the view that operant conditioning is a contiguity-based process, but that contingencies are required to produce reliable contiguity between reinforcers and particular responses.     

Determinants of spelling ability in deaf and hearing adults: Access to linguistic structure

The extent to which ability to access linguistic regularities of the orthography is dependent on spoken language was investigated in a two-part spelling test administered to both hearing and profoundly deaf college students. The spelling test examined ability to spell words varying in the degree to which their correct orthographic representation could be derived from the linguistic structure of English. Both groups of subjects were found to be sensitive to the underlying regularities of the orthography as indicated by greater accuracy on linguistically-derivable words than on irregular words. Comparison of accuracy on a production task and on a multiple-choice recognition task showed that the performance of both deaf and hearing subjects benefited from the recognition format, but especially so in the spelling of irregular words. Differences in the underlying spelling process for deaf and hearing spellers were revealed in an analysis of their misspellings: Deaf subjects produced fewer phonetically accurate misspellings than did the hearing subjects. Nonetheless, the deaf spellers tended to observe the formational constraints of English phonology and morphology in their misspellings. Together, these results suggest that deaf subjects are able to develop an appreciation for the structural properties of the orthography, but that their spelling may be guided by an accurate representation of the phonetic structure of words to a lesser degree than it is for hearing spellers.     

Studies on the categorization of speech by infants

It is well-known that complexities exist in the mapping between the acoustic information in the speech signal and the phonetic categories of adult language users. We investigated whether the same complexities exist in the mapping between the speech signal and the forerunners of these categories in infants. For two classes of complexity, we found that the manner in which the categorization of information for speech occurs was virtually identical in infant and adult listeners. These findings indicate that the infant possesses finely tuned linguistically-relevant perceptual abilities, which undoubtedly facilitate and shape the task of language acquisition.     

Speech abnormalities in seizures: a comparison of absence and partial complex seizures

In order to determine whether speech changes are useful in differentiating seizure types, a study was done in which speech abnormalities during two distinct seizure types, partial complex and absence seizures, were compared. Speech changes noted during prolonged electroencephalographic and video monitoring were compared in 16 patients with 47 partial complex seizures and 19 patients with 95 absence seizures. Speech changes were common during both seizure types. Although some significant differences in speech patterns were noted in the two seizure types, the degree of overlap was such to preclude using speech changes alone as the sole clinical criteria in differentiating the seizures.     

An auditory evoked potential study of consonant perception in different vowel environments

Auditory evoked responses (AER) to series of consonant—vowel syllables were recorded from temporal and parietal scalp locations from 20 right-handed female college students. Averaged AERs were submitted to principal components analysis and analysis of variance. Seven components of the group's AERs were found to reflect various aspects of the stimulus parameters. One component reflected changes over only the left hemisphere to different consonants independent of the following vowel sound. A second component changed systematically over both hemispheres in response to only consonant changes. A third component systematically changed for the different consonants depending on the following vowel.     

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.     

Self-directed desensitization for acrophobia

Acrophobic outpatients received therapist- or self-directed (tape-recorded) desensitization in a study of (a) treatment effectiveness with diminished therapist contact ; (b) subject characteristics ‘predicting’ outcome; and (c) generalization of change. At Post-test, treated Ss (N=16) had improved significantly more than Waiting List Ss (N=13) on self-report measures of acrophobia and general anxiety, while the treatment methods were equally effective. An 8-month follow-up found that self-directed Ss had attempted more specific behavioral situations than therapist-directed Ss, and showed additional gains on self-report measures while therapist-directed Ss maintained post-test levels. Results suggested: (a) desensitization provides effective treatment even with reduced therapist contact; (b) some subject characteristics relate to outcome and (c) treatment effects generalize to other anxiety indices.     

Judgments of recency for long sequences of pictures: the absence of a developmental trend

Recency judgments were examined for four groups (N = 40 per group) aged 7, 8, 10, and 18 years. The Ss were required to choose either the near or far item on a series of test pairs embedded within a long sequence of single inspection items. No age effects were found. Performance was more accurate the longer the separation between the original presentation of the two test items and the shorter the lag from the most recently presented item to the test. Implications for general and developmental theories of memory were discussed. The data supported the hypothesis that tasks, which do not require deliberate mnemonic strategies, are not developmentally sensitive.     

Effects of self-attributed and other-attributed gaze on interpersonal evaluations between males and females

Male and female subjects were placed together in pairs for 10 min to get to know each other and talk about anything they wished. After the conversation, an experimenter gave the participants false feedback about the amount of gaze between them during the conversation. One subject (designated Self) was reported by the experimenter to have gazed at the Other at a higher level than usual for most people, at an average level, or at a lower level than usual for most people. After the conversation and the false feedback manipulation, subjects evaluated each other on a rating form. Results of the experiment showed that females gave males the most favorable ratings when they had ostensibly gazed at the males at a high level. Males were most favorable toward females when they thought they had given the females low levels of gaze. When considering the gaze of the other person, both male and female subjects rated a low gazing partner as least attentive and a high gazing partner as most sincere. Males rated low gazing females as least attractive. Females rated males with high reported gaze as least attractive. The research was discussed in terms of Bem's theory that attitudes are a function rather than a cause of behavior. Results were integrated with past research and suggestions for further study were made.     

Knowing,feeling, and liking a psychophysiological study of attraction

Skin conductance and heart rate were recorded during verbal exchanges in which subjects were either agreed or disagreed with on a variety of issues. The manipulation of attitude similarity had significant effects on interpersonal attraction, perceived competence, and skin conductance, but not on heart rate. Disagreement produced higher skin conductance than agreement, and speaking was more arousing than listening. The correlations between arousal and attraction showed that heightened arousal was associated with both attraction toward agreers and dislike toward disagreers. As predicted, the linear relationship between attitude similarity and attraction increased in slope (0.00, 3.75, 8.75) with increasing levels of conductance (low, medium, high). The failure of subjects to prefer agreers to disagreers under conditions of low arousal suggests that information without affect does not influence attraction.