Time perception is active field of study in psychology and neuroscience. How individuals experience time is so subjective and interwoven into the fabric of our being that it cannot be directly explained it can only be tested. Current theories include that of lower dopamine in the aged (it is debated) and maturation of the prefrontal cortex and hippocampus (it is not debated). There are other minor theories which arehave less evidence for their validity. Emotions are known to affect our perception of time in a temporary way.