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Title: Spatial influences on colour opponent contributions to pattern detection. Author: Mullen KT. Journal: Vision Res; 1987; 27(5):829-39. PubMed ID: 3660643. Abstract: The contribution of colour opponent mechanisms to detection thresholds is investigated at different spatial frequencies by presenting monochromatic, sinusoidal gratings on a uniform white background. Colour opponent mechanisms, characterised by a triple peaked spectral sensitivity function, determine threshold at low spatial frequencies (below 1 c/deg) and their contribution flattens the Weber function. They display low pass spatial frequency characteristics, becoming relatively more sensitive than non-opponent mechanisms as spatial frequency decreases. Colour opponent contributions are not revealed when the test grating and background are presented dichoptically.[Abstract] [Full Text] [Related] [New Search]