In our previous two entries, we discussed how painters and writers reflected on the passage of time, and we also learned what philosophers and physicists had to say about this issue. Now it’s the time of neurobiology! How does our brain perceive time? What are the neural bases and possible mechanisms underlying time perception? Is there any internal clock or pacemaker? Is timekeeping distributed among different brain areas? Temporal processing is a daunting task. A rich gamut of behaviors depends on our capacity to calibrate and align incoming signals timely. We sample these inputs at various channels, in distant brain areas, and with different processing speeds. However, our brain does an excellent job in generating a coherent picture of the world around us, updating this report to match the fluctuation of external signals. From prestissimo to largo We can compute timing differences...