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SCREEN DANGERS

Parents aren't receiving nearly enough 8.1. .... from governments on how much time they should let their children spend using electronic devices with screens. That's the view of Dr Aric Sigman, a psychologist who has studied the 8.2. ..... research that has been done in recent years into the effects that TV, computers, games consoles and smartphones have on young children who use them. Dr Sigman has a particular interest in the way in which staring at screens for long periods makes children less able to pay attention to any one thing. To 8.3. ..... the scientific thinking on this, continuously moving from one set of images on a screen to another leads to an unnatural increase in a brain chemical called dopamine, which is a key component of the brain's reward system. Youngsters whose online activities result in them experiencing high levels of dopamine can 8.4. .... develop an addiction to their gizmos.