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In neurology, semantic dementia (SD), also known as semantic variant primary progressive aphasia (svPPA), is a progressive neurodegenerative disorder characterized by loss of semantic memory in both the verbal and non-verbal domains. However, the most common presenting symptoms are in the verbal domain (with loss of word meaning).
Tangential speech or tangentiality is a communication disorder in which the train of thought of the speaker wanders and shows a lack of focus, never returning to the initial topic of the conversation. [1]
Alzheimer's disease is a subcategory of semantic dementia which can cause similar symptoms. The main difference between the two is that Alzheimer's is categorized by atrophy to both sides of the brain, while semantic dementia is categorized by loss of brain tissue in the front portion of the left temporal lobe. [54]
Furthermore, the definition of Alzheimer's disease expanded to include earlier, non-dementia, stages. So now, MCI can either be a diagnosis associated with early Alzheimer's disease (i.e., people with MCI that also have Alzheimer's disease) or a diagnosis of cognitive decline due to a cause other than Alzheimer's disease; it is no longer ...
Other than facial expressions, body language and posture are the main non-verbal social cues that we use. [25] For instance, body language can be used to establish personal space, which is the amount of space needed for oneself in order to be comfortable. Taking a step back can therefore be a social cue indicating a violation of personal space.
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 February 2025. Long-term brain disorders causing impaired memory, thinking and behavior This article is about the cognitive disorder. For other uses, see Dementia (disambiguation). "Senile" and "Demented" redirect here. For other uses, see Senile (disambiguation) and Demented (disambiguation). Medical ...
The major avenue for the communication of power, dominance, status. There are several avenues that display non-verbal behavior. These non-verbal expressions are conveyed through kinesics, proxemics, physical appearance and artifacts, and chronemics. Kinesics is a complex method in communicating dominance and status through eye contact.
The condition causes a functional blindness to subtle non-verbal social-emotional cues in voice, gesture, and facial expression. People with this form of agnosia have difficulty in determining and identifying the motivational and emotional significance of external social events, and may appear emotionless or agnostic (uncertainty or general ...