People who experienced mild COVID-19 infections demonstrated attention and memory issues, but those problems appeared to be only temporary, according to a new study published on Wednesday.

The findings of the study showed that “COVID-19 survivors showed a significant reduction in their ability to sustain attention on a demanding task up to 9 months after COVID-19 infection, along with mild, but significantly worse, episodic memory for up to 6 months” — the latter of which refers to recalling personal past events.

“We still do not understand the mechanisms that cause these cognitive deficits, but it is very encouraging to see that these attention and memory return largely to normal in most people we tested by 6-9 months after infection, who demonstrated good recovery over time,” Oxford University Professor Masud Husain, one of the researchers involved in the study, said in a statement.