When bound to the brow chakra, the soulmeld unicorn horn grants the meldshaper the following special ability:
You gain the ability to detect evil once per round as a standard action. (Magic of Incarnum 91)
Does this detect evil effect automatically cease after 1 round? That is, must the meldshaper again activate the effect each round, making a detailed scan of the area's evil impossible? Or after activating the effect, can the meldshaper concentrate on the effect for more information as if using the spell detect evil? Or is there yet another way to read this ability?