Pupillary response Pupillary response Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve. A constriction response (miosis), is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti hypertension medications. Constriction of the pupil occurs when the circular muscle, controlled by the parasympathetic nervous system (PSNS), contracts. A dilation response (mydriasis), is the widening of the pupil and may be caused by adrenaline, anticholinergic agents or drugs such as MDMA, cocaine, amphetamines and some hallucinogenics. Dilation of the pupil occurs when the
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