Dissociating Contributions of the Motor Cortex to Speech Perception and Response Bias by Using Transcranial Magnetic Stimulation
نویسندگان
چکیده
Recent studies using repetitive transcranial magnetic stimulation (TMS) have demonstrated that disruptions of the articulatory motor cortex impair performance in demanding speech perception tasks. These findings have been interpreted as support for the idea that the motor cortex is critically involved in speech perception. However, the validity of this interpretation has been called into question, because it is unknown whether the TMS-induced disruptions in the motor cortex affect speech perception or rather response bias. In the present TMS study, we addressed this question by using signal detection theory to calculate sensitivity (i.e., d') and response bias (i.e., criterion c). We used repetitive TMS to temporarily disrupt the lip or hand representation in the left motor cortex. Participants discriminated pairs of sounds from a "ba"-"da" continuum before TMS, immediately after TMS (i.e., during the period of motor disruption), and after a 30-min break. We found that the sensitivity for between-category pairs was reduced during the disruption of the lip representation. In contrast, disruption of the hand representation temporarily reduced response bias. This double dissociation indicates that the hand motor cortex contributes to response bias during demanding discrimination tasks, whereas the articulatory motor cortex contributes to perception of speech sounds.
منابع مشابه
Smalle, Eleonore H.M. and Rogers, Jack and Möttönen, Riikka (2015) Dissociating contributions of the motor cortex to speech perception and response bias by using transcranial magnetic stimulation. Cerebral Cortex, 25
متن کامل
Dramatic Response of Resistant Obsessive Compulsive Disorder to Repeated Transcranial Magnetic Stimulation on Right Supplementary Motor Area
The response rate to the treatment of obsessive compulsive disorder (OCD) is 21.6% to 61.3%, which shows a relative resistance to current treatments and a need for novel therapeutic approaches. Here we report a case of resistant OCD with fast and dramatic response to a relatively new method of repeated transcranial magnetic stimulation. In this method a pulse magnetic field emits from a coil o...
متن کاملPrediction of the response to repetitive transcranial magnetic stimulation by spectral powers of prefrontal regions of brain.
Introduction: Quantitative assessments of the effects induced by repetitive transcranial magnetic stimulation (rTMS) are crucial to develop more efficient and personalized treatments. Objectives: To determine the spectral powers of different subbands of EEG correlated with treatment response to rTMS. Materials and Methods: the spectral powers of different...
متن کاملMEDIAN NERVE STIMULATION PO TENTIATES THE MU SCLE RESPONSES TO TRANS C RANIAL MAGNETIC STIMULATION
Motor responses evoked by transcranial magnetic stimulation OMS) or transcranial electrical stimulation (TCS) can be facilitated by a prior conditioning stimulus to an afferent nerve. Two facilitation periods are described short (SI), when the nerve stimulus is given near 0 to 10 ms after cranial stimulation, and long (LI), when nerve stimulation is given 25-60 ms before the cranial stimula...
متن کاملResponse Bias Modulates the Speech Motor System during Syllable Discrimination
Recent evidence suggests that the speech motor system may play a significant role in speech perception. Repetitive transcranial magnetic stimulation (TMS) applied to a speech region of premotor cortex impaired syllable identification, while stimulation of motor areas for different articulators selectively facilitated identification of phonemes relying on those articulators. However, in these ex...
متن کامل