Original:  William J. Friedman (1993) contrasted two theories for a sense of time: Another theory involves the brain's subconscious tallying of "pulses" during a specific interval, forming a biological stopwatch.
Revised:  William J. Friedman (1993) contrasted two theories of the sense of time: Another theory involves the brain's subconscious tallying of "pulses" during a specific interval, forming a biological stopwatch.
Edit intent: fluency