Journal article
Determining the optimal current direction of transcranial magnetic stimulation to induce motor responses in the tongue: A preliminary study of neurologically healthy individuals
Speech, Language and Hearing, Vol.16(2), pp.56-67
2013
Abstract
Objective:
To determine the optimal transcranial magnetic stimulation (TMS) coil direction for inducing motor responses in the tongue in a group of non-neurologically impaired participants.
Methods:
Single-pulse TMS was delivered using a figure-of-eight Magstim 2002 TMS coil. Study 1 investigated the effect of eight different TMS coil directions on the motor-evoked potentials elicited in the tongue in eight adults. Study 2 examined active motor threshold levels at optimal TMS coil direction compared to a customarily-used ventral-caudal direction. Study 3 repeated the procedure of Study 1 at five different sites across the tongue motor cortex in one adult.
Results:
Inter-individual variability in optimal direction was observed, with an optimal range of directions determined for the group. Active motor threshold was reduced when a participant's own optimal TMS coil direction was used compared to the ventral-caudal direction. A restricted range of optimal directions was identified across the five cortical positions tested.
Conclusions:
There is a need to identify each individual's own optimal TMS coil direction in investigating tongue motor cortex function. A recommended procedure for determining optimal coil direction is described.
Significance:
Optimized TMS procedures are needed so that TMS can be utilized in determining the underlying neurophysiological basis of various motor speech disorders.
Details
- Title
- Determining the optimal current direction of transcranial magnetic stimulation to induce motor responses in the tongue: A preliminary study of neurologically healthy individuals
- Authors
- Bruce E Murdoch (Author) - University of QueenslandCaroline H S Barwood (Author) - University of QueenslandJustine V Goozée (Author) - University of QueenslandStephan Riek (Author) - University of QueenslandDavid Lloyd (Author) - University of Queensland
- Publication details
- Speech, Language and Hearing, Vol.16(2), pp.56-67
- Publisher
- Taylor & Francis
- DOI
- 10.1179/2050571X13Z.0000000009
- ISSN
- 2050-5728
- Organisation Unit
- Graduate Research School; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99472605202621
- Output Type
- Journal article
Metrics
15 Record Views