Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
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Question: Abstract: Five children, aged 6 to 16 years, were tested for unilateral discrimination and interhemispheric transfer of tactile information as well as tactuomotor learning at various intervals before and after therapeutic callosotomy. Comparison of preoperative and postoperative capacities revealed that younger children are considerably less affected by the interruption of callosal transmission than older children. Bilateral organization of speech and participation of the anterior commissure can largely be excluded as possible compensatory mechanisms. The most plausible explanation for the excellent preservation of interhemispheric integration of tactile functions in the younger patients appears to be continued reliance on ipsilateral pathways. The relatively greater deficits observed in the older children, on the other hand, suggest that sensorimotor functions come to depend more extensively on contralateral pathways as the corpus callosum reaches functional maturity.

Answer: Adolescence


Question: Abstract: Previous investigation in normal humans has demonstrated reduced ventilation and ventilatory responses to chemical stimuli during sleep. Most have interpreted this to be a product of decreasing central nervous system sensitivity to the normal stimuli that maintain ventilation, whereas other factors such as increasing airflow resistance could also contribute to this reduction in respiration. To improve our understanding of these events, we measured ventilation and occlusion pressures (P0.1) during unstimulated ventilation and rebreathing-induced hypercapnia during wakefulness and non-rapid-eye-movement (NREM) and rapid-eye-movement (REM) sleep. Eighteen subjects (10 males and 8 females) of whom seven were snorers (5 males and 2 females) were studied. Ventilation was reduced during both NREM and REM sleep (P less than 0.05), but this decrement in minute ventilation tended to be greater in snorers than nonsnorers. Unstimulated P0.1, on the other hand, was maintained or increased during sleep in all groups studied, with males and snorers showing the largest increase. The hypercapnic ventilatory response fell during both NREM and REM sleep and tended to be lower during REM than NREM sleep. However, the P0.1 response to hypercapnia during NREM sleep was well maintained at the waking level although the REM response was statistically reduced. These studies suggest that the mechanism of the reduction in ventilation and the hypercapnic ventilatory response seen during sleep, particularly NREM sleep, is likely to be multifactorial and not totally a product of decreasing central respiratory drive.

Answer: Adult


Question: Abstract: We have measured the increase in height and width of the vertebral bodies and expressed them as percentages of the total growth in children aged 10 to 17 years. The first group, 10 boys and 10 girls, each had a single thoracic adolescent idiopathic scoliosis while the second group, 10 girls, each had a single lumbar adolescent idiopathic scoliosis. No significant differences were found between the growth increments and spinal dimensions of the vertebral bodies involved in the scoliotic curve and those vertebrae outside the curve in the same patient. The vertebrae were more slender in girls than in boys.

Answer:
Adolescence


