Multiple clocks in mental time processing

How does the mind keep track of time? Timing capacity is one of the key elements not only of learning, but also of our sense of identity and agency. This capacity is the most basic feature of the brain working, it connects an individual mind with its environment. May there be a metronome independent of other structures that acts as a unit of temporal measurement? There are two different possible answers to this question that imply a completely different understanding of the workings of attention, and so of individual consciousness. First, we could say that there is a specific area that always pulses at the same frequency, which works as a timer. In this sense, we have to suppose that it starts to pulse at some point of the development of the neural system. The features which define different contents of perception would then depend on those internal and subjective rhythms that are related to this original timing unit. Under this perspective, attentional content is a step-by-step sum of speedier activations compared to this timer. But, as we will argue here, this is only one possible answer, for we should also consider the existence of multiple clocks and an alternative way of measuring time might depend on their integration or overlap.