Constipation is a subjective symptom of various pathological conditions. Incidence of constipation fluctuates from 2 to 30% in the general population. Approximately 50% of constipated patients referred to tertiary care centers have obstructed defecation constipation. Constipation of obstructed defecation may be due to mechanical causes or functional disorders of the anorectal region. Mechanical causes are related to morphological abnormalities of the anorectum (megarectum, rectal prolapse, rectocele, enterocele, neoplasms, stenosis). Functional disorders are associated with neurological disorders and dysfunction of the pelvic floor muscles or anorectal muscles (anismus, descending perineum syndrome, Hirschsprung's disease). However, this type of constipation should be differentiated by colonic slow transit constipation which, if coexists, should be managed to a second time. Assessment of patients with severe constipation includes a good history, physical examination and specialized investigations (colonic transit time, anorectal manometry, rectal balloon expulsion test, defecography, electromyography), which contribute to the diagnosis and the differential diagnosis of the cause of the obstructed defecation. Thereby, constipated patients can be given appropriate treatment for their problem, which may be conservative (bulk agents, high-fiber diet or laxatives), biofeedback training or surgery.
Previous research revealed age differences in following the gaze of others. To date, however, investigations have concentrated on only young faces as target stimuli. The present study explored whether varying the age of target stimuli moderated gaze following in younger and older adults. Overall, older participants showed less evidence of gaze following, but this was qualified by the age of the face viewed. Younger participants showed an own-age bias, following the gaze cues of stimuli depicting those in their own age range to a greater extent than stimuli depicting older adults. However, a similar own-age effect was not found for older participants. These findings suggest that age differences in gaze following may be driven by younger participants having an advantage for processing the gaze cues from the faces of younger adults, highlighting the importance of varying the age of the target stimuli when assessing age differences in some aspects of social perception.
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