Dissociating Statistically Determined Normal Cognitive Abilities and Mild Cognitive Impairment Subtypes with DCTclock

Area of Science:

• Neuroscience
• Cognitive Psychology
• Medical Diagnostics

Background:

• Early detection of dementia is crucial for timely intervention.
• Existing diagnostic tools may not fully capture subtle cognitive changes.
• The DCTclock is a novel tool designed to assess cognitive function.

Purpose of the Study:

• To evaluate the DCTclock's ability to distinguish between different patient groups suspected of dementia.
• To assess the sensitivity of DCTclock parameters in identifying cognitive impairment.

Main Methods:

• 123 patients were categorized into cognitively normal (CN), subtle cognitive impairment (SbCI), amnestic cognitive impairment (aMCI), and mixed/dysexecutive cognitive impairment (mx/dysMCI) groups.
• Nine outcome variables were analyzed, including a combined command/copy score and specific indices for drawing efficiency, motor operations, processing speed, and spatial reasoning.

Main Results:

• The total combined command/copy score significantly differentiated between all patient groups, with medium to large effect sizes.
• The mx/dysMCI group consistently scored lower across all command indices compared to CN and SbCI groups.
• Specific command indices, particularly those related to drawing efficiency and spatial reasoning, showed significant differences between patient groups.

Conclusions:

• DCTclock command/copy parameters can effectively differentiate between cognitively normal individuals and subtypes of mild cognitive impairment.
• Command-related metrics from the DCTclock appear sensitive to early cognitive decline.
• Further research with larger cohorts is recommended to validate these findings.