For instance, let’s say you were really happy at your sixteenth birthday party. In this case, it will be easiest for you to recall memories of this event during future moments when you feel happy.
On the other hand, if you were really sad at your party, the opposite will hold true -- it will be easiest for you to recall this event during future periods of sadness.
But here’s the interesting thing …
The vast majority of existing research on this particular topic has dealt with episodic memories, which are memories of specific events and experiences (e.g. where you were at when 9/11 occurred).
However, very little research has been done on the relationship between moods/emotions and semantic memories, which are knowledge of general facts and concepts (e.g. the year 9/11 occurred in).