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Long periods of use of Information and Communication Technology (ICT) may raise strong emotions and lead to cognitive fatigue. The current study focused on the impact of ICT use the preceding day on the next-day salivary cortisol pattern in 72 school-aged children (39 at the age ten and 33 at the age 13). Salivary cortisol levels were measured at five time points from awakening to bedtime. Time spent in different ICT activities the day before salivary sampling was measured by an activity diary.doi:10.4236/psych.2010.12012 fatcat:uda6tzexqbhfxcv2xd6qfvbjfe