In the AS Complete Companion, the summaries at the end of chapter 2 (page 58), the text regarding the weaknesses of learning theory says that ‘Schaffer and Emerson (1964) found infants were most attached to the adult who fed them’. This is wrong, as the text earlier in the chapter states that they found that infants were not necessarily most attached to the person that fed them – a more important factor in the development of attachment was the responsiveness of the adult (see page 35).