An illustration of the model of motivational and emotional development suggested by the ideas of Hebb, Bruch and Buck. Initially, there is little or no differentiation of emotional and alimentary needs. Over time, via reciprocal processes of feedback and socialization (social biofeedback) with a caregiver or caregivers who is/are attentive to infant cues and respond(s) differentially to emotional and alimentary needs, the infant or child learns to discriminate these needs as distinct and to behave differentially in response to them. The end result is an individual who can accurately identify and appropriately satisfy emotional and alimentary needs. Numerous factors not illustrated here (e.g., culture, historical circumstances, caregiver pathology, infant temperament) can affect the caregiver and/or infant side of the social biofeedback system, potentially resulting in poor awareness, discrimination and/or differentiation of emotional and alimentary needs.