Theory
Experiments in cognitive science and social psychology have revealed a wide variety of biases in areas such as statistical reasoning, social attribution, and memory.
Choice-supportive memory distortion is thought to occur during the time of memory retrieval and was the result of the belief that, "I chose this option, therefore it must have been the better option." It is also possible that choice-supportive memories arise because an individual is only paying attention to certain pieces of information when making a decision or to post-choice cognitive dissonance. In addition, biases can also arise because they are closely related to the high level cognitive operations and complex social interactions.
Memory distortions may sometimes serve a purpose because it may be in our interest to not remember some details of an event or to forget others altogether.
Read more about this topic: Choice-supportive Bias
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