Broadband Internet and Cognitive Functioning*

We empirically examine the impact of high-speed internet access on cognitive functioning using data from the Household, Income and Labour Dynamics in Australia survey and crystallised and fluid intelligence measures. Leveraging differences in the National Broadband Network rollout across Australia, we find that high-speed internet access causes a decline in crystallised intelligence and that the effects are mediated by social capital and moderated by age and gender. Although no overall effect on fluid intelligence was observed, a decline was noted in young adults. These findings underline the nuanced influence of high-speed internet access on different aspects of cognitive function.