tachylalia tachylalia tachylalia or tachylogia is extremely rapid speech. tachylalia by itself is not considered a speech disorder. tachylalia occurs in many clutterers and many people who have speech disorders. tachylalia is a generic term for speaking fast, and does not need to coincide with other speech problems. tachylalia may be exhibited as a single stream of rapid speech without prosody, and can be delivered quietly or mumbled. tachylalia can be simulated by stimulating the brain electronically. tachylalia can occur with parkinson's disease.