“…There are other hormonal changes which also have been observed to have two peaks in the menstrual cycle (Greene & Dalton, 1953;Dalton, 1959;Janowsky, Gorney & Mandell, 1967;Margerison, Anderson & Dawson, 1964;Bruce & Russell, 1962;Sargent & Weinman, 1966;Southam & Gonzaga, 1965). Although it has not been possible to relate the changes definitely to any one hormone, it is still possible to see how a hormonal change could affect the pitch estimates because of their known general effect on the body.…”