| Common Initial | Behavioral Symptoms | Cognitive Symptoms | Commonly Affected |
---|---|---|---|---|
 | Presentation |  |  | Brain Region |
FvFTDa | Personality | Occur Early: | Executive dysfunction | Frontal/prefrontal |
 | change | Disinhibition | Impaired working memory | cortex |
 |  | Impulsivity | Perseveration | Anterior temporal |
 |  | Stereotypies | Attentional deficits | cortex |
 |  | Apathy |  |  |
 |  | Hyperorality |  |  |
SDb | Language | Occur Early or Late: | Fluent dysphasia | Middle and inferior |
 | abnormality | Emotional distance | Impaired semantic memory | temporal neocortex |
 |  | Interpersonal coldness | Preserved autobiographical |  |
 |  |  | and working memory |  |
PAc | Language | Occur Late: | Non-fluent/expressive | Left perisylvian |
 | abnormality | May include any of the | dysphasia | cortex |
 |  | above |  |  |