Differential contributions of the two cerebral hemispheres to temporal and spectral speech feedback control.

Proper speech production requires auditory speech feedback control. Models of speech production associate this function with the right cerebral hemisphere while the left hemisphere is proposed to host speech motor programs. However, previous studies have investigated only spectral perturbations of the auditory speech feedback. Since auditory perception is known to be lateralized, with right-lateralized analysis of spectral features and left-lateralized processing of temporal features, it is unclear whether the observed right-lateralization of auditory speech feedback processing reflects a preference for speech feedback control or for spectral processing in general. Here we use a behavioral speech adaptation experiment with dichotically presented altered auditory feedback and an analogous fMRI experiment with binaurally presented altered feedback to confirm a right hemisphere preference for spectral feedback control and to reveal a left hemisphere preference for temporal feedback control during speaking. These results indicate that auditory feedback control involves both hemispheres with differential contributions along the spectro-temporal axis.

Phonetic detail and lateralization of reading-related inner speech and of auditory and somatosensory feedback processing during overt reading.

Phonetic detail and lateralization of inner speech during covert sentence reading as well as overt reading in 32 right-handed healthy participants undergoing 3T fMRI were investigated. The number of voiceless and voiced consonants in the processed sentences was systematically varied. Participants listened to sentences, read them covertly, silently mouthed them while reading, and read them overtly. Condition comparisons allowed for the study of effects of externally versus self-generated auditory input and of somatosensory feedback related to or independent of voicing. In every condition, increased voicing modulated bilateral voice-selective regions in the superior temporal sulcus without any lateralization. The enhanced temporal modulation and/or higher spectral frequencies of sentences rich in voiceless consonants induced left-lateralized activation of phonological regions in the posterior temporal lobe, regardless of condition. These results provide evidence that inner speech during reading codes detail as fine as consonant voicing. Our findings suggest that the fronto-temporal internal loops underlying inner speech target different temporal regions. These regions differ in their sensitivity to inner or overt acoustic speech features. More slowly varying acoustic parameters are represented more anteriorly and bilaterally in the temporal lobe while quickly changing acoustic features are processed in more posterior left temporal cortices. Furthermore, processing of external auditory feedback during overt sentence reading was sensitive to consonant voicing only in the left superior temporal cortex. Voicing did not modulate left-lateralized processing of somatosensory feedback during articulation or bilateral motor processing. This suggests voicing is primarily monitored in the auditory rather than in the somatosensory feedback channel. Hum Brain Mapp 38:493-508, 2017. © 2016 Wiley Periodicals, Inc.

[Burnout in general practitioners]. / Burnout bei niedergelassenen Arztinnen und Arzten für Allgemeinmedizin.

BACKGROUND: The term "burnout" refers to emotional and physical exhaustion, indifference, cynicism, a reduced sense of work satisfaction, and social withdrawal, which - apart from internal factors - are contingent upon work overload, a lack of "control" options, i.e., possibilities in self-determination, inadequate financial compensation, breakdown of social networks, absence of fairness, and conflicting basic values. The boundaries between the notions of burnout and depression are porous. METHODS: General practitioners in Tirol were the subject of a survey using the Maslach Burnout Inventory and supplementary items in a questionnaire; the return rate was 41.3 %. RESULTS: Over a third of participants (35.8 %) reported that they were "in danger of burnout"; 27.2 % indicated high burnout values for the categories of emotional exhaustion, 3.2 % for depersonalization, and 10.0 % for cynicism. The mean values were outside of the range which might warrant therapeutic intervention. The study did not reveal any noteworthy correlations based upon either age or gender (p > 0.05). Medical professionals licensed under the national health insurance plan tended to show greater burnout than professionals practicing outside the public plans. GPs who took part in supervisory services reported significantly less burnout. CONCLUSIONS: The data suggests that the topic of burnout in the medical profession in Austria continues to merit study and discussion and that the provision of supervision might be a relevant option.