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In page Nancy Bayley:

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Variations in intelligence across the lifespan led Bayley to conclude that intelligence is not fixed at birth, but instead impacted by encounters with environmental factors.[1] Bayley thus argued that hindrances in development stemmed from social influences, such as poverty, rather than psychological influences.[citation needed] Other factors Bayley considered vitally important to development were parenting attitudes and behaviors.[citation needed] Examinations of x-rays and physiological growth led Bayley to become the first scientist to recognize the predictability of adult height based on infant size.[citation needed] Additionally, Bayley discovered no gender differences in terms of physical and psychological development.[citation needed]