The Dubois County Sheriff's Department says a Jasper man suffered a head injury in a motorcycle accident Thursday night on Meridian Road north of State Road 164. Police say 47-year-old Robert Stenftenagel apparently locked up the back wheel of his motorcycle and lost control. The cycle tipped over on its side throwing Stenftenagel off before it slid off the roadway. A witness told police she noticed sparks coming from the motorcycle in her rear view mirror shortly after she passed it. She turned around and found Stenftenagel on the side of the road. He was taken to Jasper Memorial Hospital for treatment of a head injury.