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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]
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]
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]
Cluttering is sometimes confused with stuttering. Both communication disorders break the normal flow of speech, but they are distinct. A stutterer has a coherent pattern of thoughts, but may have a difficult time vocally expressing those thoughts; in contrast, a clutterer has no problem putting thoughts into words, but those thoughts become disorganized during speaking.
William James was the first psychologist to describe the tip of the tongue phenomenon, although he did not label it as such. The term "tip of the tongue" is borrowed from colloquial usage, [2] and possibly a calque from the French phrase avoir le mot sur le bout de la langue ("having the word on the tip of the tongue").
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.