Why may participants feel more comfortable in unmoderated usability studies?

Participants may feel more comfortable in unmoderated usability studies because there is no need for a moderator to be present. This environment allows users to interact with a product or system independently, which can reduce pressure and anxiety that might come from being observed in a moderated setting. Participants might feel free to express their true thoughts and behaviors without the influence of a moderator's presence, enabling a more natural and genuine interaction with the product. This autonomy can lead to more authentic feedback about the usability of a design, as participants may feel less self-conscious and more at ease exploring the interface.

The other aspects mentioned, such as supervision by a moderator, incentives to participate, and familiarity with study procedures, do not directly relate to the comfort level provided by the absence of moderation. While these factors may enhance the overall quality or effectiveness of the study, they do not specifically explain the comfort derived from an unmoderated format.