Flight Crew Last 90 Days 200; Flight Crew Total 11000; Flight Crew Type 4000
Workload; Human-Machine Interface; Troubleshooting; Confusion
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Aircraft Equipment Problem Dissipated; Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft
We were on the arrival into our filed destination and had just finished deviating around a few thunderstorms.  All of the sudden we got an ECAM that the autothrottles turned OFF and we got an ECAM that the autothrottles were in thrust lock.  Then the Number 1 engine suddenly rolled back to idle thrust while the Number 2 engine remained at normal thrust.  We declared an emergency letting ATC know we were experiencing and engine failure and we would get back to them.  Within one minute later; we were able to regain normal control of the Number 1 engine; but not the autothrust.  We rescinded the emergency with ATC and continued the flight to ZZZ1 without the autothrust.  The rest of the flight was uneventful.
An A320's autothrottle transitioned to THRUST LOCK followed by the number one engine spooling back.  The crew declared an emergency; but the engine returned to normal operation with no autothrottles.