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We use a statistical model to investigate the detectability (defined by therequirement that they are in causal contact with us) of communicatingcivilizations within a volume of the universe surrounding our location. If thecivilizations are located in our Galaxy, the detectability requirement imposesa strict constraint on their epoch of appearance and their communicatinglifespan. This, in turn, implies that the fraction of civilizations of which wecan find any empirical evidence strongly depends on the specific features oftheir temporal distribution. Our approach shed light on aspects of the problemthat can escape the standard treatment based on the Drake equation. Therefore,it might provide the appropriate framework for future studies dealing with theevolutionary aspects of the search for extraterrestrial intelligence (SETI).

The Impact of the Temporal Distribution of Communicating Civilizations on their Detectability