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These experiments were instrumental in localizing language function in the brain, and they demonstrated that language capabilities are largely lateralized in the left hemisphere. To communicate with the right hemisphere, researchers have subjects use their left hand to gesture responses in some way.
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In the split-brain paradigm experiments, subjects are able to articulate stimuli presented to their right field of view (left hemisphere, where Broca's area is), but unable to do so for stimuli presented to their left side (right hemisphere, where language is lacking). These findings are consistent with other evidence that inner speech is a form of silent (simulated) outer speech, and thus uses the same physical mechanism. Such studies suggest that inner speech is primarily localized to Broca's area (LIFG, on the left side of the brain), just as is outer speech ( McGuire, 1996 Morin & Hamper, 2012 Wikipedia). Relatively recently, new techniques for studying inner speech have been developed, such as fMRI imaging of subjects instructed to or prevented from engaging in self-reflection and internal monologue.
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If self-reports of awareness are so significantly inaccurate, then what are we to make of split-brain patients' self-evaluation of conscious experience and other cognitive functions? The truth is, we just don't know. However testing under lab conditions demonstrates that subjects do in fact experience significant changes in awareness - effectively neglecting half of their perceptual experience. Internal monologue remains intact, and appears to function as normal. Split-brain patients in general report no significant post-operative changes in their cognitive function, sense of self, or conscious experience. This is especially exacerbated in patients with awareness deficiencies such as split-brain. Second, remember that one of the key reasons why inner speech is problematic to investigate is because up until recently, our main data source has been self-reports, considered notoriously unreliable as a methodology. As the resulting Venn diagram suggests, there is next to nothing known about inner speech in split-brain patients. Add to this that inner speech is not a well studied area in general. This has an adverse effect on the behavior, judgment and general performance.Let's first keep in mind that very few split-brain patients have ever been studied. When the emotions are also evoked, more power, energy and attachment are added. The more you conduct them, the more you become chained to them, unable to stop them. These inner talks create a snowball effect. There is a constant activity of judging people, commenting on what is going on, planning, gossiping, and conducting mental conversations with people you know or don’t know. The inner dialogue continues while working, studying, reading, watching TV, talking, walking and eating. Sometimes, it is a dialogue with ourselves, and sometimes, it is just a monologue.
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It is the little voice in your head that comments on your life, circumstances and situations, and on other people.The process of repeating words and thoughts in the mind.The process of asking yourself questions and answering them.