The article claims that the animals were not exposed to selection based on their domesticity, but it includes this line "These animals are regularly provided wi

The article claims that the animals were not exposed to selection based on their domesticity, but it includes this line "These animals are regularly provided with food and water, and investigated by the researchers." It strikes me that that situation represents a selection pressure, because mice that are more afraid of humans, are likely to avoid a place where they are regularly present, and thus lose the advantage of the risk-free meal ticket these particular humans are providing.