Internal attribution, or dispositional attribution, is when someone ascribes a personal reason as the cause of something instead of an external force.
As an example, say you only ran 3 miles yesterday instead of 5 miles like you planned. Sure, it was raining cats and dogs outside, and they were meowing and barking at you the entire time, but you remembered you slept in 5 minutes last night because your mom made you an extra batch of butternut cookies the night before and completely blamed yourself for the poor performance. Clearly, it wasn’t your fault, but your mom’s.
You internally attributed the fault of the problem rather than properly assessing the external factor.