Recent findings indicate that it might be
necessary to integrate data from several approaches to reveal the
neural mechanisms of interval timing. The evidence supports the
idea that there are two timing circuits that can be
dissociated: an automatic timing system that works in the
millisecond range, which is used in discrete-event (discontinuous)
timing and involves the cerebellum; and a continuous-event,
cognitively controlled timing system that requires attention
and involves the basal ganglia and related cortical structures.
Because these two timing systems work in parallel, suitable
experimental controls might be required to engage (and reveal) each
system independently of the other.