Cracked plaster finish coat - causes?

[chassis]

My home was built in 1950, with walls made of 24 inch plaster board, brown coat and finish coat. I have some finish coat cracking (delaminating) away from the brown coat, on an exterior wall on the first floor of a two story house. The area in question is not below a window or downspout, and there is no obvious damage in the exterior brick veneer. There is a window about 18 inches away from the cracked area. The damaged area is near the top of the wall, where the wall meets the ceiling. The ceiling plaster is not damaged. There is no HVAC ductwork in the area. There is no damage to the ceiling or wall in the bedroom above the damaged area. The damaged area is not damp.

I'm perplexed. Could normal seasonal temperature/humidity changes cause the plaster to delaminate in small sections after 50 years? Thanks for any replies.

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[Davestone]

Water and movement are the only two things i can think of, unless someone is bouncing a ball off it and it wasn't solid to begin with. :shrug:

[KenH83]

Normal season changes don't effect plaster work, proof in your 50 year old home with good sound plaster every were else. Sounds to me like you've got movement with the wall in question. :(