Pondering about their resents was stressful, and subjects found the rumination unpleasant. Bulimia nervosa and gastroparesis are especially prevalent among the misdiagnoses of rumination. The PCS is broken into three subscales being magnification, rumination, and helplessness. "Extrovert" is Partridge's rumination on overcoming his shyness. There are two main coping mechanisms, rumination and distraction. A very private individual, Gaddafi was given to rumination and solitude and could be reclusive. There is little evidence concerning the impact of hereditary influence in rumination syndrome. Patients often describe a feeling similar to the onset of a belch preceding rumination. Cud is produced during the physical digestive process of rumination. The cause of rumination syndrome is unknown. Based on typical observed features, several criteria have been suggested for diagnosing rumination syndrome. Diagnosis of rumination syndrome is non-invasive and based on a history of the individual. The occurrence of rumination syndrome within the general population has not been defined. Overcrowding of cows in barns has been found to reduced feeding, resting and rumination. Other theories, however, have proposed different definitions for rumination.