We recall negative memories more than good memories because of evolutionary reasons. Researchers have found that negative memories are remembered more vividly than positive ones, possibly because emotions and memories interact. In particular, when the emotions and memories are negative. In neuroimaging studies, scientists have discovered that the parts of the brain responsible for processing emotions, such as the amygdala and the orbitofrontal cortex, involve in encoding and retrieving bad memories. Negative emotions such as fear and sadness cause a part of the brain that maintains memories to become more active. Despite the fact that these memories are preserved in greater detail than happy or neutral ones, they can also be subject to distortion. For example, an eyewitness a shooting may remember seeing the gun vividly, but may not recall details about the surroundings.