After chicks were fitted with special lenses that visually displaced objects to the left, they O quickly learned to compensate by pecking to the left of where the food appeared to be.
O only gradually learned to compensate by pecking to the left of where the food appeared to be.
O immediately adapted and pecked successfully at the food.
O never adapted to the visual distortion.
O only gradually learned to compensate by pecking to the right of where the food appeared to be.