WASHINGTON (AP) — President Barack Obama has called Gabrielle Giffords on the anniversary of the Arizona congresswoman's shooting and noted her "incredible road to recovery."

The White House says Obama expressed "amazement at the courage and determination" that Giffords has shown in the aftermath of the shooting outside a Tucson grocery store last January.

The gunman killed six people and shot 13 others. Giffords was hit in the head.

The 41-year-old Giffords has spent the last year in Houston undergoing intensive physical and speech therapy. She is able to walk and talk, and vote in Congress.

Doctors have said it would take many months to determine the lasting effects of her brain injury. The three-term congresswoman has four months to decide whether to seek re-election.