Research on deception focused on the investigation of event-related potentials (ERP) to facilitate our knowledge on cognitive-motivational processes underlying deception. We investigated the reliability of the frontal N2 amplitude in a modified Concealed Information Test (CIT) (N = 64 participants). Variations of Cronbach's Alpha coefficients were examined for number of epochs per stimulus type, task modality and types of ERP quantification. Cronbach's Alpha coefficients of the N2 increased with the number of epochs across task modality, stimulus types and electrode positions. In a pictorial CIT, the frontal N2 indicated excellent Cronbach's Alpha coefficients (≥ .90) across electrode positions and quantification methods for 25 epochs per stimulus type. At least 15 epochs for an excellent Cronbach's Alpha coefficients (≥ .90) of the peak-to-peak N2 in a modified CIT across electrode positions and stimulus types. We provide best-practice advises for the necessity to assess N2 in a modified CIT with excellent reliability.

中文翻译：

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N2 成分在改进的 3 刺激隐藏信息测试中的可靠性：关于出色测量精度的重要性

欺骗研究的重点是对事件相关电位 (ERP) 的调查，以促进我们对欺骗背后的认知动机过程的了解。我们在修改后的隐藏信息测试 (CIT) 中调查了额叶 N2 振幅的可靠性（N = 64 名参与者）。针对每种刺激类型、任务模式和 ERP 量化类型的时期数，检查了 Cronbach Alpha 系数的变化。N2 的 Cronbach Alpha 系数随着任务模式、刺激类型和电极位置的 epoch 数而增加。在图片 CIT 中，额叶 N2 在每个刺激类型的 25 个时期的电极位置和量化方法中显示出出色的 Cronbach's Alpha 系数 (≥ .90)。对于出色的 Cronbach Alpha 系数（≥ . 90) 不同电极位置和刺激类型的改良 CIT 中的峰峰值 N2。我们提供最佳实践建议，以确保在具有出色可靠性的修改后的 CIT 中评估 N2 的必要性。