Background： Anecdotally, parents often report that children with attention deficit hyperactivity disorder （ADHD） who engage in regular physical activity （PA） experience positive behavioral changes. The purpose of...Background： Anecdotally, parents often report that children with attention deficit hyperactivity disorder （ADHD） who engage in regular physical activity （PA） experience positive behavioral changes. The purpose of this study was to examine this anecdotal relationship to provide preliminary evidence relevant to the potential benefits of PA on ADHD symptoms. Methods： Parents （n = 68） of children diagnosed with ADHD completed an lnternet survey assessing perceptions of how PA influences their child＇s symptoms. Results： A significantly greater percentage of parents reported that regular PA positively impacted symptoms. However, there were no uniform effects for all types of ADHD symptoms. The results indicate that there may be more positive benefits for symptoms of inattention and hyperactivity than for those of impulsivity. Conclusion： This is the first study to empirically document parents＇ perceptions of how PA influences ADHD and suggests that PA can be a viable strategy for reducing symptoms. PA may have greater benefits for specific symptoms of ADHD, providing critical information for developing PA interventions for children and adolescents.展开更多
With the growing popularity of digital devices, lntemet has become an integral part of teenagers＇ daily life. As teenagers are in a complicated period of development, parents struggle in supervising their use of the ...With the growing popularity of digital devices, lntemet has become an integral part of teenagers＇ daily life. As teenagers are in a complicated period of development, parents struggle in supervising their use of the intemet. This study takes the teenagers＇ standpoint and explores how the teenagers perceive their parents＇ involvement in their Internet use. Survey was conducted towards teenagers in the UAE, which has the highest penetration of digital devices in the Gulf region as well as one of the highest in the world. The results showed that girls usually receive more supervision fi＇om parents than boys. The older the teenagers are and the more they depend on the Internet, the more they perceive parents＇ supervision to be beneficial. However, not enough supervision has been given to those who access the Internet more frequently. The findings indicate more parents＇ supervision is needed from the teenagers＇ point of view. Discussions are made from psychological and socio-cultural perspectives and suggestions for future research are presented.展开更多
Alarm calls are emitted by Richardson＇s ground squirrels Urocitellus richardsonii in response to avian and terrestrial predators. Conspecifics detecting these calls respond with increased vigilance, promoting predato...Alarm calls are emitted by Richardson＇s ground squirrels Urocitellus richardsonii in response to avian and terrestrial predators. Conspecifics detecting these calls respond with increased vigilance, promoting predator detection and evasion, but in doing so, lose time from foraging. That loss can be minimized if alarm call recipients discriminate among signalers, and weight their response accordingly. For juvenile ground squirrels, we predicted that the trade-off between foraging and vigilance could be optimized via selective response to alarm calls emitted by their own dam, and/or neighboring colony members over calls broad- cast by less familiar conspecifics. Alarm calls of adult female Richardson＇s ground squirrels were elicited in the field using a predator model and recorded on digital audio tape. Free-living focal juveniles were subjected to playbacks of a call of their mother, and on a separate occasion a call from either another adult female from their own colony, or an adult female from another colony. Neither immediate postural responses and escape behavior, nor the duration of vigilance manifested by juveniles differed with exposure to alarm calls of the three adult female signaler types. Thus, juveniles did not respond preferentially to alarm calls emitted by their mothers or colony members, likely reflecting the high cost of ignoring alarm signals where receivers have had limited opportunity to establish past signaler reliability [Current Zoology 58 （5）： 773-780, 2012].展开更多
文摘Background： Anecdotally, parents often report that children with attention deficit hyperactivity disorder （ADHD） who engage in regular physical activity （PA） experience positive behavioral changes. The purpose of this study was to examine this anecdotal relationship to provide preliminary evidence relevant to the potential benefits of PA on ADHD symptoms. Methods： Parents （n = 68） of children diagnosed with ADHD completed an lnternet survey assessing perceptions of how PA influences their child＇s symptoms. Results： A significantly greater percentage of parents reported that regular PA positively impacted symptoms. However, there were no uniform effects for all types of ADHD symptoms. The results indicate that there may be more positive benefits for symptoms of inattention and hyperactivity than for those of impulsivity. Conclusion： This is the first study to empirically document parents＇ perceptions of how PA influences ADHD and suggests that PA can be a viable strategy for reducing symptoms. PA may have greater benefits for specific symptoms of ADHD, providing critical information for developing PA interventions for children and adolescents.
文摘With the growing popularity of digital devices, lntemet has become an integral part of teenagers＇ daily life. As teenagers are in a complicated period of development, parents struggle in supervising their use of the intemet. This study takes the teenagers＇ standpoint and explores how the teenagers perceive their parents＇ involvement in their Internet use. Survey was conducted towards teenagers in the UAE, which has the highest penetration of digital devices in the Gulf region as well as one of the highest in the world. The results showed that girls usually receive more supervision fi＇om parents than boys. The older the teenagers are and the more they depend on the Internet, the more they perceive parents＇ supervision to be beneficial. However, not enough supervision has been given to those who access the Internet more frequently. The findings indicate more parents＇ supervision is needed from the teenagers＇ point of view. Discussions are made from psychological and socio-cultural perspectives and suggestions for future research are presented.
文摘Alarm calls are emitted by Richardson＇s ground squirrels Urocitellus richardsonii in response to avian and terrestrial predators. Conspecifics detecting these calls respond with increased vigilance, promoting predator detection and evasion, but in doing so, lose time from foraging. That loss can be minimized if alarm call recipients discriminate among signalers, and weight their response accordingly. For juvenile ground squirrels, we predicted that the trade-off between foraging and vigilance could be optimized via selective response to alarm calls emitted by their own dam, and/or neighboring colony members over calls broad- cast by less familiar conspecifics. Alarm calls of adult female Richardson＇s ground squirrels were elicited in the field using a predator model and recorded on digital audio tape. Free-living focal juveniles were subjected to playbacks of a call of their mother, and on a separate occasion a call from either another adult female from their own colony, or an adult female from another colony. Neither immediate postural responses and escape behavior, nor the duration of vigilance manifested by juveniles differed with exposure to alarm calls of the three adult female signaler types. Thus, juveniles did not respond preferentially to alarm calls emitted by their mothers or colony members, likely reflecting the high cost of ignoring alarm signals where receivers have had limited opportunity to establish past signaler reliability [Current Zoology 58 （5）： 773-780, 2012].
