LONDON: A strong emotional arousal may be driving some Twitter users to get obsessed with the microblogging site, a new study suggests.

Researchers examined the mental activity of 114 volunteers while they tweeted on phones, tablets and laptops, using a technique called steady-state topography. They found markedly higher responses than the norm in the three areas which correspond to emotional arousal, feelings of personal relevance, and memory.

Emotional arousal is linked to sites in the back right half of the brain, and the study used activity at the right parieto-temporal site to assess the intensity of emotions elicited by the service, the Guardian reported.

For people actively using the platform, sending tweets or searching for other, those responses were 75 per cent higher than the online norm; but even for those just passively reading the service, the response was 64 per cent more intense.

Twitter scores quite so highly because "people are seeing stuff in a context which is immensely personally relevant," said Heather Armstrong, chief executive at Neuro Insight, which carried out the study.