wikipedia | Subvocalization is commonly studied using electromyography (EMG) recordings,[5] concurrent speaking tasks,[6][7][8] shadowing,[6] and other techniques.[6][7]
EMG can be used to show the degree to which one is subvocalizing[5] or to train subvocalization suppression.[9] EMG is used to record the electrical activity produced by the articulatory muscles involved in subvocalization. Greater electrical activity suggests a stronger use of subvocalization.[5][9] In the case of suppression training, the trainee is shown their own EMG recordings while attempting to decrease the movement of the articulatory muscles.[9] The EMG recordings allows one to monitor and ideally reduce subvocalization.[9]
In concurrent speaking tasks, participants of a study are asked to complete an activity specific to the experiment while simultaneously repeating an irrelevant word.[6] For example, one may be asked to read a paragraph while reciting the word "cola" over and over again.[8] Speaking the repeated irrelevant word is thought to preoccupy the articulators used in subvocalization.[6] Subvocalization, therefore, cannot be used in the mental processing of the activity being studied. Participants who had undergone the concurrent speaking task are often compared to other participants of the study who had completed the same activity without subvocalization interference. If performance on the activity is significantly less for those in the concurrent speaking task group than for those in the non-interference group, subvocalization is believed to play a role in the mental processing of that activity.[6][7][8][9] The participants in the non-interference comparison group usually also complete a different, yet equally distracting task that does not involve the articulator muscles [7][9](i.e. tapping). This ensures that the difference in performance between the two groups is in fact due to subvocalization disturbances and not due to considerations such as task difficulty or a divide in attention.[7][9]
Shadowing is conceptually similar to concurrent speaking tasks. Instead of repeating an irrelevant word, shadowing requires participants to listen to a list of words and to repeat those words as fast as possible while completing a separate task being studied by experimenters.[6]
Techniques for subvocalization interference may also include counting,[7][8] chewing [10] or locking one's jaw while placing the tongue on the roof of one's mouth.[10]
Subvocal recognition involves monitoring actual movements of the tongue and vocal cords that can be interpreted by electromagnetic sensors. Through the use of electrodes and nanocircuitry, synthetic telepathy could be achieved allowing people to communicate silently.[11]
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