Transcranial magnetic stimulation (TMS) has become a practical and effective technique in its use to study cognitive function (Jahanshahi & Rotherwell, 2000). It has been used to explore the motor-cortex, through its visible muscle twitch effect after stimulation, and primary visual pathways (Jahanshahi & Rotherwell; Beckers & Zeki, 1995). Through this exploration it was found that TMS can be used to create ‘virtual lesions’ in the brain in which cortical processing is disrupted (Jahanshahi & Rotherwell). Thus, it is a valuable asset in identifying the roles of different parts of the brain in various tasks (Jahanshahi & Rotherwell). However, there are methodological and procedural difficulties which need to be considered when using TMS.
Besides creating electrical stimulation in the brain TMS has several ancillary effects which can distract participants from the tasks they perform and distort results (Jahanshahi & Rotherwell , 2000; Anand & Hotson, 2002). Eye blinking,......
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