La acción humana
On its initial November 12, 2009 broadcast in the United States, "Of Human Action" was watched by an estimated 5.89 million viewers, and earned a 2.2 ratings share among adults 18–49, tying the season average. This was a 29 percent increase from the previous episode's 1.7 rating, though that episode's low ratings have been attributed to the unexpected end to the 2009 World Series. Despite the ratings improvement, "Of Human Action" led "Fringe" to finish in fourth place for its timeslot.