Network architecture can lead to robust synchrony in coupled maps and to codimension one bifurcations from synchronous fixed-points at which the associated Jacobian is nilpotent. We discuss the codimension one synchrony-breaking period-doubling bifurcations for three-cell coupled maps. Interesting phenomena occur for all these coupled maps a branch of period-2 points with amplitude growing as λ~(1/6) for coupled networks of feed-forward type, as well as multiple (two) branches of period-2 points with amplitude growing as λ~(1/2) for coupled networks of feed-forward type. We also discuss how some results related to patterns of synchrony that are valid for coupled vector fields are also valid for coupled maps.
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