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However, the right hemisphere has sufficient language understanding capabilities to gesture meaningful responses without the left hemisphere's awareness. 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. 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).
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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. 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. In the philosophical field of language there is much research about internal speech in correlation with the building and usage of phrases in one's own idiom and thus the importance of language in the process of thinking.Let's first keep in mind that very few split-brain patients have ever been studied.
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Attribution for an internal monologue may lead to concerns over schizophrenia, hallucinations, or hearing voices.Ĭontemplation attempts to calm the internal voice by various means. In some medical or mental conditions there is uncertainty about the source of internal sentences. When people read, their internal monologue actually moves their muscles slightly as if they were speaking this is called subvocalizing. Some of this can be considered as speech rehearsal.
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Much of what people consciously report "thinking about" may be thought of as an internal monologue, a conversation with oneself. It also refers to the semi-constant internal monologue one has with oneself at a conscious or semi-conscious level. Internal monologue, also known as inner voice, internal speech, or verbal stream of consciousness is thinking in words. Freebase (5.00 / 1 vote) Rate this definition: