The Tussle Between Brain Waves and Hairstyles: A Case Study of Usability Challenges with an Entry-Level EEG Device for Female Participants

This study investigates the hardware-related usability challenges that arise when using an entry-level Electroencephalography (EEG) device, specifically the Emotiv EPOC+, in user studies involving female participants. We focused on how head size and hair characteristics impact EEG signal quality and conducted a time-controlled training and usability session with five participants. We assessed hair density, texture, and length through self-reports and visual verification, and measured head circumference directly. Our results show that participants with thicker hair and larger head sizes had greater difficulty achieving proper electrode-scalp contact, which increased impedance and reduced signal quality. Additionally, participants with straight hair experienced slippage that compromised headset stability. As an exploratory pilot case study, this work identifies critical inclusivity gaps in current EEG headset design and offers actionable insights for HCI researchers aiming to improve the usability of EEG technologies for diverse female participants.