in intraretinal , extracellular recordings , two negative-going responses were identified that are maximal around the inner plexiform layer , and distinct from pii , which is maximal in distal retina : under light-adapted conditions , a spatially tuned response at light and light offset , the `` '' m-wave '' '' ( previously described in cold-blooded animals by karwoski & proenza ( 1977 , 1980 ) ) , and under dark-adapted conditions , the scotopic threshold response , or `` '' str , '' '' a response at light onset .
C1512785
inner plexiform layer
C0035298
retina