Mydriasis pupil) or overactivity of the sympathetic nervous system (SNS). Pupil diameter also increases in reaction to cognitive tasks requiring memory and attention, and this phenomenon is used as an indicator of mental activation (‘arousal’) in psychophysiological experiments . Natural release of the hormone oxytocin can cause mild to moderate mydriasis. Parasympathetic fibers travel with cranial nerve III, the oculomotor nerve, to innervate the circular layer of muscle of the eye (sphincter pupillae). Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil, which causes mydriasis, remains unaffected, and therefore unopposed. Multiple central nervous system
The Widening Gyre (album) studio to open up musically while somehow managing to help keep the integrity of Altan intact», the album is the result of a fusion «of the traditional Irish music that the members of Altan are known for, namely Donegal fiddling and Gaelic singing traditions, with American roots music, particularly that of the Appalachian bluegrass fiddle» and a celebration of the relationships between Altan and lifelong friends they've made through music. "The Widening Gyre" straddles time as it manages to remind listeners of the ancient bond between Irish and Appalachian music while at the same time breaking new ground through collaborations