When we remember our past selves, they seem quite different. We know how much our personalities and tastes have changed over the years. But when we look ahead, somehow we expect ourselves to stay the same, a team of psychologists said Thursday, describing research they conducted of people’s self-perceptions.

They called this phenomenon the “end of history illusion,” in which people tend to “underestimate how much they will change in the future.”

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Why? Dr. Gilbert and his collaborators … had a few theories, starting with the well-documented tendency of people to overestimate their own wonderfulness.

“Believing that we just reached the peak of our personal evolution makes us feel good,” Dr. Quoidbach said. “The ‘I wish that I knew then what I know now’ experience might give us a sense of satisfaction and meaning, whereas realizing how transient our preferences and values are might lead us to doubt every decision and generate anxiety.”

Or maybe the explanation has more to do with mental energy: predicting the future requires more work than simply recalling the past. “People may confuse the difficulty of imagining personal change with the unlikelihood of change itself,” the authors wrote in Science.