The goal of this project is to test the feasibility, acceptability and efficacy of an attention training intervention (Attention Process Training; APT-3) as a potential treatment for brain fog symptoms experienced by people with Long-Covid. There already is good empirical evidence to support the idea that the APT-3 treatment is feasible and effective in improving attention in people with acquired brain injuries, but information about its efficacy and acceptability in people with Long-Covid brain fog is lacking.