In the course of Parkinson's disease (PD) speech and language (SL) deficits may often emerge. In addition, severe verbal fluency (VF) decline has been repeatedly observed in the context of deep brain stimulation (DBS) in PD. Interestingly, while PD non-DBS patients have deficits with respect to loudness and intelligibility of their voice, PD patients who have undergone DBS (PD-DBS) suffer rather from difficulties in semantic and phonemic word retrieval, and from speech apraxia symptoms.