“…Thus, the fact that 440 Hz (as opposed to, say, 450 Hz) is denoted as 'A' is purely cultural whereas the fact that notes of 220 Hz, 880 Hz and 110 Hz are considered perceptually similar to 440 Hz is assumed to reflect an underlying property of auditory processing. For some synaesthetes, pitch class appears to be the strongest determinant of elicited colour (Bernard, 1986;Carroll and Greenberg, 1961;Haack and Radocy, 1981;Langfeld, 1914;Myers, 1915;Peacock, 1985;Riggs and Karwoski, 1934;Rogers, 1987;Vernon, 1930). Thus, all notes corresponding to the pitch class of 'A' would have the same colour in spite of differences in pitch height.…”