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State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior

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Reliability of TMS phosphene threshold estimation: Toward a standardized protocol.

Chiara Mazzi¹, Silvia Savazzi¹, Arman Abrahamyan²

¹Perception and Awareness (PandA) Laboratory, Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Italy; National Institute of Neuroscience-Verona, Italy.

Brain Stimulation

|February 18, 2017

Summary

The Method of Constant Stimuli (MOCS) and Rapid Estimation of Phosphene Threshold (REPT) offer reliable phosphene threshold estimation for transcranial magnetic stimulation (TMS) research, unlike the Modified Binary Search (MOBS). These findings guide optimal TMS dosing in visual cognition studies.

Keywords:

Phosphene threshold Psychophysics Transcranial magnetic stimulation (TMS)Vision

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Area of Science:

Neuroscience
Visual Cognition
Psychophysics

Background:

Phosphenes, visual sensations from transcranial magnetic stimulation (TMS), are crucial for assessing brain excitability.
Estimating phosphene threshold is vital for determining TMS doses in visual cognition research.

Purpose of the Study:

To compare the reliability of common phosphene threshold estimation methods.
To address the lack of direct comparison for selecting appropriate TMS doses.

Main Methods:

Comparison of Method of Constant Stimuli (MOCS), Modified Binary Search (MOBS), and Rapid Estimation of Phosphene Threshold (REPT).
Two experiments assessed reliability considering administration day, participant expertise, and initial value sensitivity.

Main Results:

MOCS and REPT demonstrated comparable reliability in phosphene threshold estimation.
MOBS method yielded less stable phosphene threshold estimations.

Conclusions:

MOCS and REPT are equally reliable choices for phosphene threshold estimation in TMS research.
Guidance provided on factors influencing threshold calculation and experimental strategies.