All of them had normal or corrected-to-normal vision according to self-report.

All observers had normal or corrected-to-normal vision and were aged between 20-40 years.

Each participant reported having normal or corrected-to-normal vision.

Typically, viewers are screened for normal vision or corrected-to-normal vision.

Four volunteers with normal or corrected-to-normal visual acuity and normal colour vision were recruited from the students and staff of the Department of Psychology at the University of Queensland to act as observers.

Participant characteristics: Participants are required to have NO MORE than FOUR years of musical training, as well as have normal or corrected-to-normal hearing and vision (e.g. wear contacts or glasses).