Leicester have now gone four games without a win since their memorable 5-3 defeat of Manchester United over a month ago and Pearson admitted his side had made too many mistakes to stop that run.
"We didn't perform as well as we should have done and didn't manage the ball well enough," Pearson said.
"You can ill-afford to make too many unforced errors and we did too many, it made it a frustrating afternoon for the players.
"It was disappointing and the bottom line is our baseline performance has to be better. I didn't feel we really gave as much as we could do to stay in the game and that is the biggest disappointment."
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