Myth busted: I turned off all my fans and over the known female mother plants that I have been cloning and growing for the last year or so... I got circles, but that was only when I approached the plants at an angle that created circular movement on the string. When ever I approached them straight, I got a standard typical pendulum swing (no more circles over the known females). Just to be sure I was not influencing the movements, I tied the string to my fixed grow light. The cap did not swing in circles or in a pendulum. It just sat still.
this seems more like a psychosomatic effect than a gender identity technique. Sorry to say. ðŸ§