**3. EMG electrode placement and signal acquisition technique**

Surface EMG is relatively easy to use as compared to other EMG electrodes. This is the reason why it is being extensively used in the control of robotic mechanisms to achieve prosthesis. It is also widely used in latest EMG researches by engineers as no medical certification or expertise is required for its application. Its use in rehabilitation prosthesis is favorable as it does not cause any kind of discomfort to the subject on whom it is applied. Other kinds of EMG electrodes (needle and fine wire), when inserted into the skin of the subject, may effect a twitching sensation and cause him or her to make movements.

In order to get the best results from SEMG, it is really important to have a proper understanding of the muscles from which the EMG signal is being extracted. The placement on skin also requires adequate study and requires skin preparation beforehand as well.

The EMG electrodes, their types, sub-types and categories have already been explained in detail in the previous section. Since, our concern is only with Surface EMG (SEMG), hence, we will only deal with the placement and signal acquisition technique using surface EMG electrodes.
