Identification of Subtle Verbal Memory Deficits in Premanifest Huntington Disease Using the California Verbal...

Area of Science:

• Neuroscience
• Genetics
• Cognitive Psychology

Background:

• Verbal memory impairment is a known symptom of Huntington disease (HD).
• The extent and nature of verbal memory deficits in premanifest Huntington disease (pre-HD) are not well understood.
• Early identification of cognitive changes in pre-HD is crucial for understanding disease progression.

Purpose of the Study:

• To assess verbal memory function in individuals with pre-HD.
• To compare pre-HD verbal memory performance against diagnosed HD patients and healthy controls.
• To utilize the California Verbal Learning Test (CVLT) to identify subtle cognitive alterations.

Main Methods:

• Compared verbal memory performance using the California Verbal Learning Test-Second Edition (CVLT-II).
• Included three groups: 77 adults with HD, 23 pre-HD gene carriers, and 54 healthy controls.
• Evaluated immediate/delayed recall, recognition, learning, errors, and retention.

Main Results:

• Pre-HD participants showed worse recall and recognition than healthy controls, but better than HD patients.
• Pre-HD and healthy groups performed similarly on immediate recall, learning slope, and semantic clustering.
• No significant differences were found in repetitions or retention across groups.

Conclusions:

• Subtle verbal memory deficits are identifiable in the premanifest stage of Huntington disease.
• Specific indices from the CVLT-II can detect these early cognitive changes.
• Findings highlight the importance of sensitive cognitive assessments in pre-HD.