Gorck
Prince of Dorkness
Not always. If a secret door is behind a tapestry, the player probably won't be able to spot it just by using Perception to scan around the room (Unless a big gust of wind blows through and moves the tapestry). The player will need to use Investigation to move the tapestry and look behind it.Definitely. Right now it's...
Player: 'I'm going to search for secret doors'
GM: 'Alright, roll Investigation'
Player: 'Oh, uh, I'm not a Wizard so I have no reason to have Int. What if I just step into the room and randomly glance around?'
GM: 'Finally! Then you can roll Perception as intended!'
Perception is standing there and looking around you, sniffing the air, listening for sounds, etc.
Investigation is going around and moving objects, picking things up, opening drawers, etc.