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Persons undergoing thought blocking may utter incomprehensible speech; they may also repeat words involuntarily or make up new words. [citation needed] The main causes of thought blocking are schizophrenia, anxiety disorders, petit mal seizures, post-traumatic stress disorder, bradyphrenia, aphasia, dementia and delirium. [2]
Anomic aphasia, also known as dysnomia, nominal aphasia, and amnesic aphasia, is a mild, fluent type of aphasia where individuals have word retrieval failures and cannot express the words they want to say (particularly nouns and verbs). [1]
Glossophobia or speech anxiety is the fear of public speaking. [1] The word glossophobia derives from the Greek γλῶσσα glossa (tongue) and φόβος phobos (fear or dread.) The causes of glossophobia are uncertain but explanations include communibiology and the illusion of transparency .
In very severe forms of expressive aphasia, a person may only speak using single word utterances. [4] [5] Typically, comprehension is mildly to moderately impaired in expressive aphasia due to difficulty understanding complex grammar. [4] [5] It is caused by acquired damage to the frontal regions of the brain, such as Broca's area. [6]
The blocking hypothesis states that retrieval cues elicit the retrieval of a word related to the target that then blocks the retrieval of the correct word and causes the tip of the tongue phenomenon to occur. [2] In other words, TOTs occur when plausible but incorrect responses to a query come to mind quickly.
This could cause anxiety and a sense of being overwhelmed in unfamiliar situations, which may cause the child or adult to "shut down" and not be able to speak (something that some autistic people also experience). Many children or adults with selective mutism have some auditory processing difficulties.