Emphasizing speed or accuracy in an eye-tracking version of the Trail-Making-Test: Towards experimental diagnostics...

Area of Science:

• Neuropsychology
• Cognitive Neuroscience
• Experimental Psychology

Background:

• The Trail-Making Test (TMT) is a widely used neuropsychological tool for assessing executive functions.
• Current TMT scores, primarily based on completion times, offer limited specificity regarding underlying cognitive processes.
• There is a need for more detailed measures to enhance the diagnostic precision of the TMT.

Purpose of the Study:

• To enhance the specificity and interpretability of the TMT.
• To investigate the utility of eye-tracking measures in capturing executive function details.
• To validate TMT scores by experimentally manipulating speed-accuracy trade-offs.

Main Methods:

• Developed a computerized eye-tracking version of the TMT.
• Implemented an experimental manipulation requiring participants to prioritize speed or accuracy.
• Analyzed eye movement data (e.g., fixations, saccades) and traditional TMT scores.

Main Results:

• Eye movement measures showed sensitivity to executive functions, particularly set-alternation, within the TMT.
• The speed-accuracy manipulation differentiated TMT scores, identifying those sensitive to cognitive control emphasis versus individual differences.
• Experimental validation distinguished TMT scores reflecting speed-accuracy prioritization from those independent of it.

Conclusions:

• Integrating eye-tracking and experimental manipulation significantly enhances the TMT's interpretability.
• These enhancements provide more specific insights into cognitive mechanisms underlying executive functions.
• The refined TMT approach promises more precise diagnoses in clinical and research settings.