Mind Map 6- this mind map outlines the explanation for forgetting called retrieval failure. Ironically enough, this is probably the topic I find hardest: there's a lot of research evidence! However, both Carter and Cassaday's study and Godden and Baddeley's study follow a similar idea: there are 4 conditions, 2 matching and 2 non-matching, and they both found that recall was better when the state or context was matching.