A gaming machine of the type that disgorges a payout is provided a signal that defines an enhanced payout interval of selective duration. A count down display provides a visual and/or audible indication of the time remaining for the enhanced payout interval. The machine disgorges an enhanced payout in concurrent response to the signal and a payout event. In one embodiment, a signal generator periodically provides a timing pulse to the gaming machine of a duration that comprises the enhanced payout interval. When a payout event occurs during the enhanced payout interval, the machine disgorges an enhanced payout. The enhanced payout may be inhibited when the coin in of the machine between timing pulses is less than a predetermined amount. In another embodiment, clock pulses increment an activity counter during a pre-selected activity interval. The enhanced payout signal may be provided to the gaming machine after the activity interval. Should coin in not occur in sufficient frequency or amount during the activity interval, the activity counter is reset, thereby preventing the enhanced payout.