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This measure consists of a series of developmental play tasks and takes between 45 – 60 minutes to administer [1] [2] and derives a developmental quotient (DQ) rather than an intelligence quotient (IQ). [3] Raw scores of successfully completed items are converted to scale scores and to composite scores.
In an experiment he conditioned infants to turn their heads to the sound of a buzzer. The training for the task began either at birth or at 31 or at 44 days. He discovered that infants took many more trials and days to learn the task if they learned from birth than the infants who learned later.
Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks. [17] During the first month, infants grow about 1 to 1.5 inches (2.5 to 3.8 cm) and gain weight at a rate of about 1 ounce (28 g) per day. [17] Resting heart rate is generally between 70 and 190 beats per minute. [18]
The vision of infants under one month of age ranges from 6/240 to 6/60 (20/800 to 20/200). [4] By two months, visual acuity improves to 6/45 (20/150). By four months, acuity improves by a factor of 2 – calculated to be 6/18 (20/60) vision. As the infant grows, the acuity reaches the healthy adult standard of 6/6 (20/20) at six months. [5]
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Mother-infant interaction at 2 months has been shown to affect the child's cognitive performance at 5 years. [ 172 ] Studies have begun to show that other forms of psychopathology (mental illness) can independently influence infants' and toddlers' subsequent social-emotional development through effects on regulatory processes within the child ...
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