Author Correction: Mental workload and neural efficiency quantified in the prefrontal cortex using fNIRS

Causse, Mickaël; Chua, Zarrin; Peysakhovich, Vsevolod; Del Campo, Natalia; Matton, Nadine · 2018 · Crossref

DOI: 10.1038/s41598-018-25614-2

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Summary

This document is an author correction issued in 2018 for a previously published article titled "Mental workload and neural efficiency quantified in the prefrontal cortex using fNIRS," which originally appeared in *Scientific Reports* in July 2017. The correction addresses a specific typographical error found in the Results section of the original paper, concerning the mathematical definition and interpretation of an index used to quantify neural efficiency. The original text incorrectly defined the neural efficiency index as the "inverted and rescaled performance subtracted from the rescaled HbO2 concentration." It further stated that higher index values, within an interval of [0, 1], indicated higher neural efficiency. The correction clarifies that the index should instead be defined as the "inverted and rescaled performance minus the rescaled HbO2 concentration." Crucially, the correction also updates the valid range of the index values from [0, 1] to [-1, 1]. Despite the change in the mathematical operation and the interval, the interpretation remains consistent: higher index values indicate higher neural efficiency. The correction does not provide new experimental data, methods, or broader findings from the study itself. Instead, it serves to rectify the technical description of how the neural efficiency metric was calculated and scaled. The original study, as referenced, utilized functional near-infrared spectroscopy (fNIRS) to measure hemoglobin oxygenation (HbO2) concentrations in the prefrontal cortex while assessing mental workload. The corrected formula ensures that the relationship between performance metrics and physiological brain activity is accurately represented for readers and researchers attempting to replicate or build upon the work. The significance of this correction lies in ensuring the mathematical integrity of the reported metrics. By adjusting the interval to [-1, 1] and clarifying the subtraction order, the authors provide a precise definition of the neural efficiency index. This allows for accurate interpretation of the results regarding how mental workload affects prefrontal cortex activity. The document confirms that the underlying data and conclusions of the original 2017 paper remain valid, with the correction solely addressing the textual and numerical representation of the efficiency index calculation. The article is published under a Creative Commons Attribution 4.0 International License, permitting sharing and adaptation with appropriate credit.

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• neuro workload indices
• workload measurement