TY  - JOUR
PY  - 1981//
TI  - Visual thresholds in dichromats and normals; the importance of post-receptoral processes
JO  - Vision research
A1  - Dain, Stephen John
A1  - King-Smith, P. Ewen
SP  - 573
EP  - 580
VL  - 21
IS  - 4
N2  - Threshold-duration curves, for 10 protanopes, 8 deuteranopes and 13 normals were measured for 1°, 674 nm foveal test flashes on a 1000 td, 556 nm background. Deuteranope thresholds were found to be higher than normal by up to 0.5 log units; temporal integration for both protanopes and deuteranopes was only about 40% of normal. These results can be understood only if post-receptoral abnormalities of dichromats are considered, specifically a lack of red-green opponent-colour neurons. Differences in shape of the threshold-duration curves are related to the sustained or transient character of the response. The normal curve for 556 nm flashes is analysed in terms of two independent detection processes.<p /> <p>Language: en</p>
LA  - en
SN  - 0042-6989
UR  - http://dx.doi.org/10.1016/0042-6989(81)90103-6
ID  - ref1
ER  -