[Memory functions in children with attention deficit/hyperactivity disorder--the effects of methylphenidate on them]

The memory functions or capacities in attention-deficit/hyperactivity disorder (AD/HD) are still not clear, though it has been pointed that the working memory in AD/HD could be impaired due to difficulties of motor inhibition or self-regulation. We examined the Auditory Verbal Learning Test (AVLT) and the Rey-Osterrieth Complex Figure Test (RCFT) in addition to the memory tasks of ordinary intelligence tests (WISC-III and K-ABC) in children with AD/HD. Whether these results could be improved by methylphenidate administration or not was also evaluated. Over the half cases had normal results without medication. Some cases in whom methylphenidate were clinically effective showed improved memory functions, especially in the auditory long-term memory, after methylphenidate administration. In conclusion, memory capacities seem normal in AD/HD. Methylphenidate does not have an effect on the memory capacities, but may improve the strategies in which the short-term memory can be effectively transferred to the long-term memory.