Further, hedonic adaptation may be a more common phenomenon when dealing with positive events as opposed to negative ones. Negativity bias, where people tend to focus more on negative emotions than positive emotions, can be an obstacle in raising one's happiness set point. Negative emotions often require more attention and are generally remembered better, overshadowing any positive experiences that may even outnumber negative experiences. Given that negative events hold more psychological power than positive ones, it may be difficult to create lasting positive change.