Majid, A., van Leeuwen, T., & Dingemanse, M. (2008). Synaesthesia: A cross-cultural pilot. In A. Majid (Ed.), Field manual volume 11 (pp. 37-41). Nijmegen: Max Planck Institute for Psycholinguistics.
Synaesthesia is a condition in which stimulation of one sensory modality (e.g. hearing) causes additional experiences in a second, unstimulated modality (e.g. seeing colours). The goal of this task is to explore the types (and incidence) of synaesthesia in different cultures. Two simple tests can ascertain the existence of synaesthesia in your community.