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PubMed1982

The possible existence of phonemic reading in the presence of Broca's aphasia: a case report.

This case study examined phonemic reading and reading comprehension in the presence of Broca's aphasia. The patient, T.B., a 16 yr old male, suffered an occlusion of the middle cerebral artery. Spontaneous speech was limited, naming difficulties were apparent, and comprehension was mildly impaired. Though the patient could read only a small number of words aloud, he was able to read silently for comprehension on a standardized instrument. Moreover, T.B. was able to match orally-presented pseudowords to their written analogs, a finding which suggests that phonemic processing for nonlexical material was to some degree intact. The results were contrasted to the reading patterns usually reported to be present in "frontal" alexia and deep dyslexia. The possible existence of a dissociation between phonemic processing in reading and speech behavior as well as its mechanism was discussed.

Adolescent↗

PubMed2001

Prearticulatory and postarticulatory self-monitoring in Broca's aphasia.

The present study examined to what extent patients with Broca's aphasia and healthy controls rely upon prearticulatory and postarticulatory monitoring processes for detecting and repairing errors in speech production. Monitoring skills were investigated in a speaking situation with normal auditory feedback, a speaking situation with white noise, and a situation in which errors had to be detected in other-produced speech. The results demonstrated that the Broca's aphasics repaired a lower percentage of errors than the controls in the situation with normal auditory feedback, whereas their performance in the noise-masked condition was comparable. In contrast to the controls, the aphasics did not suffer from the presence of white noise. In addition, the proportion of covert repairs was higher for the Broca's aphasics than for the healthy controls. These findings indicate that Broca's aphasics concentrate primarily on prearticulatory monitoring. Possible explanations for this strong reliance on prearticulatory monitoring processes are discussed.

Adult↗

PubMed1978

[Broca's aphasia. The clinical picture and a consideration of the neurolinguistic structure (author's transl)].

Broca's aphasia is characterized by disorders on the phonemic, syntactic and lexical level of linguistic description. It is not only the patient's speech which is impaired; abilities to comprehend, read and write are likewise impaired. Articulatory disorders (dysarthria) which are due to an impaired innervation of the phonatory and articulatory musculature may exist. However these disorders do not account for all the linguistic deficits found in cases of Broca's aphasia. The characteristic feature enabling a differential diagnosis of Broca's aphasia is agrammatism.

Adult↗

PubMed1983

Speech sound errors in patients with conduction and Broca's aphasia.

Speech sound errors exhibited by three conduction and three Broca's aphasic patients on naming and word-repetition tasks were subjected to phonemic and subphonemic analyses. In the conduction aphasic patients, errors occurred equally often on consonants and vowels in both the naming and word-repetition tasks, while in the Broca's aphasic patients errors occurred selectively on consonants. Transposition errors occurred almost as often as substitution errors in the conduction aphasic patients, while substitution errors constituted the majority of errors in the Broca's aphasic patients. The Broca's aphasic patients, as compared to the conduction aphasic patients, exhibited a markedly higher number of substitution errors occurring between phonemes separated by a single subphonemic feature on the naming task. On the basis of these findings, it was hypothesized that the differences in the error patterns of the two types of aphasia reflected differences in the underlying mechanisms of the impairment in each type.

Adult↗

PubMed2005

Clause structure and verb movement in a Greek-English speaking bilingual patient with Broca's aphasia: evidence from adverb placement.

In this paper, we investigate the performance of a Greek-English bilingual patient with Broca's aphasia and mild agrammatism on the placement of CP, MoodP, AspectP, and NegP-related adverbs, labeled specifier-type adverbs, and VP-related adverbs, labeled complement-type adverbs, by means of a constituent ordering task and a grammaticality judgment task. Based on the results derived by means of these two different tasks in both Greek and English, we argue that (i) the CP layer causes great difficulties to aphasic performance in both languages but it is not missing from aphasic grammar, whereas the VP layer remains intact in both languages; (ii) the MoodP, AspectP, and NegP-related adverbs cause more difficulties in English that in Greek. We attribute this to the independent differences between English and Greek that relate to properties of verbal morphology and syntactic head movement.

Adult↗

PubMed2001

Agrammatic Broca's aphasia is not associated with a single pattern of comprehension performance.

One influential hypothesis posits that the brain regions implicated in Broca's aphasia are responsible for specific syntactic operations that are necessary for the comprehension and production of sentences (Grodzinsky, 1986, 1990, in press). The empirical basis of this hypothesis is the claim that Broca's aphasics have no difficulty understanding sentences in the active voice (and other "canonical" sentence types, such as subject relatives and clefts with negative predicates), but perform at chance level with passive voice constructions (and other "noncanonical" sentences such as object-gap relatives and object clefts). In the face of well-established results indicating that Broca's aphasics can exhibit several different performance patterns on these sentence types, Grodzinsky, Piñango, Zurif, and Drai (1999) argued that these conflicting results do not challenge the theory when the data are analyzed appropriately. They carried out a creative statistical analysis of the comprehension performance of published cases of Broca's aphasia and concluded that all of these cases are in agreement with the predicted pattern: chance on passives and 100% correct on actives. Here we show that the statistical reasoning adopted by Grodzinsky et al. (1999) is flawed. We also show that the comprehension performance of a substantial number of the Broca's aphasics in their own sample does not conform to the pattern required. Rather, contrary to these authors' claim, Broca's aphasia is not associated with a consistent pattern of sentence comprehension performance, but allows for a number of distinct patterns in different patients.

Aphasia, Broca↗

PubMed1999

Comprehension regularity in Broca's aphasia? There's more of it than you ever imagined.

We analyze the comprehension data in Broca's aphasia, pooled together by Berndt, Mitchum, and Haendinges (1996). We show that once analyzed properly, these data have statistical structure that is very similar to that revealed by the analysis in Grodzinsky, Pinango, Zurif, and Drai (1999). The suggestion that the latter authors doctored the data to obtain a desired outcome is as false as the claim that the data in Berndt et al. show no regularity. Comprehension scores in Broca's aphasia do have statistical structure, which correlates with syntactic structure. Thus, the role of Broca's area and its vicinity in language processing can be made more precise.

Aphasia, Broca↗

PubMed1989

Facilitating generalized requesting behavior in Broca's aphasia: an experimental analysis of a generalization training procedure.

The effects of a generalization training procedure on requesting by 4 subjects with chronic Broca's aphasia were examined using a multiple baseline design across behaviors and subjects. Subjects were trained to request information on three topics sequentially. Generalization across topics and persons was assessed in weekly probe sessions consisting of 5-min conversational interactions with trainers and unfamiliar volunteers in a nontreatment setting. Results revealed generalization effects were greatest when trainers, as opposed to unfamiliar volunteers, served as conversational participants. Nevertheless, subjects' requests increased with all conversational participants to a level comparable to a normal comparison group assessed under conditions identical to the experimental probes. Social validation of treatment effects using a subjective evaluation procedure revealed significant improvement on the parameters of talkativeness, inquisitiveness, and conversational success.

Aphasia↗

PubMed1996

Dissociated identity and semantic priming in Broca's aphasia: how controlled processing produces inhibitory semantic priming.

Broca's aphasics performed a lexical decision task in a semantic priming experiment in which the proportion of related words was manipulated with a sufficiently long stimulus onset asynchrony for expectancy-based, strategic processing to operate. The control subjects showed the typical increase in semantic facilitation as relatedness proportion increased. However, the aphasic subjects demonstrated the opposite effect such that inhibitory semantic priming occurred as relatedness proportion increased even though, in a second experiment, these same aphasics showed an increase in facilitatory identity priming as relatedness proportion increased. This striking dissociation of identity and semantic priming for the aphasics was interpreted as supporting the "center-surround" theory (Carr & Dagenbach, 1990), which accounts for the same dissociation found in the normal population under challenging word-recognition conditions.

Adult↗

PubMed1989

Dysprosody in Broca's aphasia: a case study.

A detailed acoustic analysis of timing, intensity, and fundamental frequency (F0) at different levels of linguistic structure was conducted on the speech output of a Broca's aphasic who was a native speaker of Thai. Timing was measured with respect to syllables, phrases, and sentences in connected speech. Intensity variation at the sentence level was measured in connected speech. F0 variation associated with the five Thai tones was measured in both isolated words and connected speech. Results indicated that timing was differentially impaired depending upon complexity of articulatory gesture and size of the linguistic structure. Timing, as well as intensity, was aberrant at the sentence level. In contrast, F0 contours of the five tones were spared at all levels of linguistic structure. Findings are interpreted to support the view that dysprosody in Broca's aphasia is more applicable to speech timing than to F0.

Aphasia↗

PubMed1987

Experimental analysis of syntax training in Broca's aphasia: a generalization and social validation study.

A multiple baseline design across responses was used to examine the effect of syntax training on the sentence production of 4 individuals with chronic Broca's aphasia. Subjects were trained to produce five exemplars of five sentence types from Helm's Elicited Language Program for Syntax Stimulation (Helm-Estabrooks, 1981). Generalization and maintenance of trained sentence types to novel exemplars and novel stimulus conditions served as dependent measures. In addition, five naïve judges rated subjects' responses before and following the treatment in terms of their "adequacy." Generalization to novel exemplars was demonstrated sequentially by 3 subjects (i.e., following the teaching of all five forms), and the remaining subject demonstrated generalization for three of five sentence types trained. Maintenance was variable across subjects and sentence types. Generalization across stimulus conditions was limited for all subjects. Adequacy judgments revealed improved communication skills for wh-questions but limited changes in the perceived adequacy of subjects' declarative responses. These findings indicate that the effects of syntax training procedures are limited to those grammatical constructions taught, that generalization of learned forms to novel stimulus conditions is not an automatic consequence of acquisition, and that the effect of such training on the adequacy of subjects' responses may be limited.

Adult↗

PubMed1997

Crossed cerebellar diaschisis in chronic Broca's aphasia.

The cerebellum has anatomical connections to the cerebral cortex, through which it can affect language function. To study these connections, we investigated patients with chronic Broca's aphasia using MRI and single-photon emission computed tomography (SPECT). We selected 15 such patients (9 male, 6 female, aged 17-64 years, mean age 56 years) from 30 chronically aphasic patients. Using the results of SPECT, we divided them into patients with (group 1) and without (group 2) crossed cerebellar diaschisis (CCD). We compared the language function of the two groups. Patients in group 1 showed classical Broca's aphasia, while patients in group 2 showed mainly word-finding difficulty. Patients with CCD hat infarcts involving the lower part of the frontal gyrus but patients without CCD did not, which suggests that this region may have functional and anatomical connections with the cerebellum. Our findings support the notion that the cerebellum contributes to language.

Adolescent↗

PubMed1984

Persistent Broca's aphasia after right cerebral infarction in a right-hander.

A strongly right-handed man developed sudden mutism and left hemiplegia 2 days after a myocardial infarct. Evaluation 6 1/2 years later revealed persistent Broca's aphasia. There was no clinical, CT, or EEG evidence of left brain injury or disease. This case is another example of dissociation of cerebral dominance for speech and handedness. However, the severe and persistent language disorder is rare. The paucity of documented case reports supports the traditional view of strong interdependence of handedness and speech cerebral lateralization.

Aphasia↗

PubMed1999

Electromagnetic articulography treatment for an adult with Broca's aphasia and apraxia of speech.

Electromagnetic articulography (EMA) was explored as a means of remediating [s]/[symbol in text] articulation deficits in the speech of an adult with Broca's aphasia and apraxia of speech. Over a 1-month period, the subject was provided with 2 different treatments in a counterbalanced procedure: (1) visually guided biofeedback concerning tongue-tip position and (2) a foil treatment in which a computer program delivered voicing-contrast stimuli for simple repetition. Kinematic and perceptual data suggest improvement resulting from visually guided biofeedback, both for nonspeech oral and, to a lesser extent, speech motor tasks. In contrast, the phonetic contrast treated in the foil condition showed only marginal improvement during the therapy session, with performance dropping back to baseline 10 weeks post-treatment. Although preliminary, the findings suggest that visual biofeedback concerning tongue-tip position can be used to treat nonspeech oral and (to a lesser extent) speech motor behavior in adults with Broca's aphasia and apraxia of speech.

Aphasia, Broca↗

PubMed2006

Broca's area and inflectional morphology: evidence from broca's aphasia and computer modeling.

In a series of articles Ullman (2001, 2004; Ullman et al., 1997) has proposed that regular inflection is critically subserved by Broca's area. This suggestion is motivated by the finding that English speaking Broca's aphasics show selective deficits with regular inflection. Here we argue that this proposal does not hold cross-linguistically but is based on a confound between inflectional suffix and regularity that is specific to the English language. We present data from two experimental studies of participle inflection with 13 German and 12 Dutch Broca's aphasics. None of these aphasic speakers are selectively impaired for regular inflection but instead most of them show selective deficits with irregular inflection. These data suggest that a selective regular deficit is not a characteristic of Broca's aphasia across languages, and that Broca's area is not critically involved in regular inflection. To investigate the nature and localization of the processes underlying inflection we present a connectionist neural network model that accounts for the deficits of the German aphasic speakers. The model implements the view that the inflection of all verb types is based on a single mechanism with multiple representations that emerge from experience-dependent brain development. We show that global damage to this model results in a selective deficit for irregular inflection that is comparable to that of the German aphasic speakers. This finding suggests that a selective impairment of irregular participles as observed by German and Dutch aphasic speakers does not presuppose two distinctly localized mechanisms or processes that can be selectively affected by brain damage.

Adult↗

PubMed1991

Broca's aphasia following damage to Wernicke's area. For or against traditional aphasiology?

Classic aphasiology has been challenged by studies that have employed cranial computed tomography to test predicted anatomic-behavioral correlations. We treated a patient who developed a classic Broca's aphasia but whose computed tomographic scan revealed damage to Wernicke's area, thus seeming to contradict the principles of traditional aphasiology. However, subsequent information obtained by magnetic resonance imaging, intracarotid amobarbital (Amytal) testing, and electrophysiologic studies, including cortical stimulation, demonstrated that the brain-behavior correlations in this patient can be understood in terms of the formulations of traditional aphasiology.

Adult↗

PubMed1985

Phoneme errors in Broca's aphasia: three Finnish cases.

The phonemic errors of three Finnish Broca's aphasics were analyzed according to various phonological features, frequency of segments, syllable, word, and stress positions, as well as for the phonotactic structure of the uncanonical products. It was found, e.g., that the distance between the syntagmatic error and its source could not be satisfactorily counted by phonemes, since the syllable had to be taken into account also in pathological Finnish. As regards the paradigmatic dimension of the errors, the number of incorrect features is even here in reverse relation to the frequency of the erroneous phonemes. Moreover, it was found that pure quantity errors and vowel harmony deviations are infrequent in the speech of Finnish Broca's aphasics.

Adult↗

PubMed1986

Sex-linked left lateralized central processor for hierarchically-structured material? Evidence from Broca's aphasia.

Based on a study with seven nonfluent aphasics, Grossman (Neuropsychologia 18, 299-308, 1980) advanced the 'central processor' claim that the mental representation of hierarchical linguistic structure is functionally equivalent to processing hierarchically-structured, nonlinguistic forms. Grossman reported that both abilities are compromised in Broca's aphasia. We attempted to replicate this effect with eight nonfluent aphasics using essentially the same task requiring the reconstruction from memory of stick designs. With the addition of controls for post-stroke interval, responding hand and gender, only the female aphasics had difficulty executing the hierarchical arrangement of visual-spatial materials. This sex difference disputes the strong form of the central processor hypothesis and supports the view that females may be more likely to possess partial noncomplementarity of specialization (dependence on the same hemisphere for selective language and spatial functions).

Adult↗