(A) Individual tasks were created using jsPsych, an open-source javascript front-end library. Dynamic sequences of psychoacoustic tasks were implemented using Django, an open-source library for web applications, and combined with consent pages, questionnaires, and debriefing pages. Subjects were recruited via Prolific.co, a platform for recruiting human subject for web-based studies. (B) A number of screening procedures were implemented to select participants for stereo headphone use, (putative) normal-hearing status, and attentive engagement via an entry study. Participants meeting criteria were re-invited to participate in the validation experiments using Prolific’s allowlist feature.