Disfluent speech associated with brain damage

The frequency and type of disfluencies in the spontaneous speech of 15 people with Broca's aphasia and right hemiplegia was studied. Two aged-matched control groups (15 nonaphasic stroke patients with left hemiplegia and 15 normals) were also studied. The frequency of disfluencies in the speech of aphasics was three times greater than that in the speech of either control group. However, most of the disfluencies uttered by aphasics were of the types commonly found in speech of normals.     

Outcome expectancy,locus of attribution for expectancy,and self-directed attention as determinants of evaluations and performance

Are internal versus external attributions of responsibility for prior outcomes important determinants of subsequent performances? or is their effect limited to influencing the affective and evaluative experiences that are associated with the task outcomes? Recent theoretical statements appear to differ on this issue. The present study examined the question, while at the same time testing the influence of self-directed attention on the process under investigation. Subjects attempted a series of mazes in collaboration with an ostensible cosubject (actually a confederate). The pair experienced either three consecutive sucesses or three consecutive failures. Subjects were led to perceive the responsibility for these outcomes as residing primarily with themselves or primarily with their partner. Self-focus was manipulated (by a mirror) prior to attempting a fourth maze and completing a set of rating scales. Success-condition subjects performed better on the fourth maze in the mirror's presence than in its absence, whereas failure-condition subjects tended to perform more poorly in the mirror's presence than in its absence. The manipulation of internal versus external attributions did not influence behavior, but did influence subjects' affective and evaluative reactions to themselves and their partner. Discussion centers on the relationship between these findings and other recent findings in the areas of attribution and achievement-related behavior.     

A mental-health locus of control scale

The purpose of this study was to develop and seek initial validation of a mental- health locus of control scale. Twenty-six mental-health professionals rated each of the 14 statements of a previously-designed mental-health service request form along a 5-point locus of control scale. Six of the 14 items met the study's criteria for inclusion in the mental-health locus of control scale. Discriminant validity of the scale was provided by a study demonstrating that psychotic patients were more external in their perceived locus of control than were a nonpsychotic patient comparison group. Other validation studies and research are suggested.     

Speech prosody in Broca's aphasia

Because speech prosody is thought to be impaired in Broca's aphasia, we conducted three experiments using Broca's aphasics and nonneurological control subjects in order to determine to what extent this statement is accurate. Using three acoustic measures of speech prosody—sentence-final fundamental frequency (F₀) fall, F₀ declination, and sentence-final lengthening—we found that some aspects of prosody were spared while others were abnormal. All Broca's aphasics, regardless of degree of impairment, exhibited sentence-final F₀ fall. F₀ declination was present in simple sentences but was absent over longer domains; moreover, the amount of declination was correlated with the degree of linguistic impairment. Sentence-final lengthening was clearly absent in Broca's aphasia; in fact, sentence-terminal words were actually shorter than their sentence-initial and medial counterparts.     

Exposure and response prevention of morbid ruminations and compulsive avoidance

Two patients with morbid ruminations and compulsive avoidance behavior were independently treated by the authors with exposure and response prevention strategies. The patients were quite different with respect to age (23 vs 58), occupational status (student vs civil servant) and length of disorder (2 vs 40 years), although their disorders were quite similar. The present report describes the patients and treatment procedures and reports on dramatic behavioral changes that occurred within brief time periods.     

Linguistic recovery after closed head injury

Recovery from acute aphasia after closed head injury was studied in 21 young adults at least 6 months after injury. Three profiles of scores were found using standardized language tests. Persistent expressive and receptive impairment was present in 6 patients who sustained severe diffuse brain injury resulting in global cognitive deficit. Residual expressive impairment, primarily of naming, was associated with mild diffuse brain injury though focal left-hemisphere injury was present in 3 of 6 cases. Patients who recovered to normal levels on all language tests generally had acute neurologic findings consistent with mild diffuse brain injury. Cranial computed tomography at the time of followup frequently disclosed ventricular enlargement.     

Stimulus control of spatial behavior on the eight-arm maze in rats

Rats were trained on an eight-arm, elevated radial maze in a large cylindrical chamber where extramaze stimuli could be manipulated. The first experiment indicated that rats could use extramaze stimuli to locate the arms if such stimuli were available, whereas they performed less effectively and tended to employ response chaining if these stimuli were not available. The second experiment demonstrated that maze performance was disrupted by transposition of the stimuli but was relatively unaffected by rotation of the same stimuli. The third experiment suggested that the disruptive effect of stimulus transposition might be due to a “resetting” process elicited by the alteration in the configuration of the stimuli after stimulus transposition. These results suggest that when extramaze stimuli are available, rats tend to use such stimuli in a configurational manner to locate the arms rather than as a list of items processed independently of their spatial relationships to each other.