robert bjork - retrieval induced forgetting

When retrieving information from memory the retrieved memory will be strengthened. However, competing memories will be less accessible afterwards. This implies that remembering doesn't only produce positive effects for the remembered facts or events, but it might also lead to forgetting of other, related things in memory.

[@lizzieanne8948]

Well this explanation just saved about an hour of trying to figure out the structure of this paradigm.... thank you!

[@vaibhavanandsharma88]

Easy explanation. Love the relaxed way he explains this seemingly paradoxical and difficult to comprehend theory. Love from India.

[@tullochgorum6323]

I'm not clear why this result is regarded as mysterious and counter-intuitive. We know that our brains evolved to recall the important and forget the ephemeral. By only revising a subset of the categories, we are surely sending a clear message to our brain that the subset we didn't revise is not important and can be safely forgotten.
Or am I misunderstanding something?