TY - JOUR
T1 - Anomalous pupillary responses to M-cone onsets are linked to L:M ratio
AU - Parry, Neil R.A.
AU - Rodrigo-Diaz, Elena
AU - Murray, Ian J.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - M-cone stimulation induces a pupil constriction to stimulus offset, whereas, with L cones, the pupil responds conventionally with a constriction to onset. To test the possibility that this paradox is linked to the LVMratio, we measured the strength of the effect by injecting a variable amount of positive or negative luminance contamination on either side of M-cone isolation and identifying a balance point at which the pupil responded equally to onset and offset.Nineteen individualswere recruited. In observers with lowLVMratio, the paradoxical effect wasweak. There was a significant relationship (r2 =0.561) between the balance point and LVMratio. The effect is likely to be linked to strong inhibitory signals associated with cone-opponent pathways.
AB - M-cone stimulation induces a pupil constriction to stimulus offset, whereas, with L cones, the pupil responds conventionally with a constriction to onset. To test the possibility that this paradox is linked to the LVMratio, we measured the strength of the effect by injecting a variable amount of positive or negative luminance contamination on either side of M-cone isolation and identifying a balance point at which the pupil responded equally to onset and offset.Nineteen individualswere recruited. In observers with lowLVMratio, the paradoxical effect wasweak. There was a significant relationship (r2 =0.561) between the balance point and LVMratio. The effect is likely to be linked to strong inhibitory signals associated with cone-opponent pathways.
U2 - 10.1364/JOSAA.382262
DO - 10.1364/JOSAA.382262
M3 - Article
SN - 1084-7529
VL - 37
SP - 163
EP - 169
JO - Optical Society of America. Journal A: Optics, Image Science, and Vision
JF - Optical Society of America. Journal A: Optics, Image Science, and Vision
IS - 4
ER -