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Updated: Nov 8, 2025

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
Montage-related Variability in the Characteristics of Envelope Following Responses
Matthew Urichuk1,2, Vijayalakshmi Easwar2,3, David Purcell1,2
1Health and Rehabilitation Sciences, Western University, London, Ontario, Canada.
Objectives:
The study aimed to compare two electrode montages commonly used for recording speech-evoked envelope following responses.
Design:
Twenty-three normal-hearing adults participated in this study. EFRs were elicited by a naturally spoken, modified /susa∫i/ stimulus presented at 65 dB SPL monaurally. EFRs were recorded using two single-channel electrode montages: Cz-nape and Fz-ipsilateral mastoid, where the noninverting and inverting sites were the vertex and nape, and the high forehead and ipsilateral mastoid, respectively. Montage order was counterbalanced across participants.
Results:
Envelope following responses amplitude and phase coherence were significantly higher overall in the Cz-nape montage with no significant differences in noise amplitude. Post hoc testing on montage effects in response amplitude and phase coherence was not significant for individual stimuli. The Cz-nape montage also resulted in a greater number of detections and analyzed using the Hotelling's T2.
Conclusions:
Electrode montage influences the estimated characteristics of speech-evoked EFRs.
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