In our second reversal of roles, Lily was spreadeagled on the table before Aiden was presented with the option of freedom or tickling her friend's nude body. Aiden was warned, that if she left, Lily was likely to experience a more rigorous test of her nervous system than tickling. By this point, we were not surprised that Aiden chose to remain and tickle Lily quite vigorously. Both girls were soon exhausted; the results rein conclusions reached in 1), 2) and 3).