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ERIC Number: EJ844424
Record Type: Journal
Publication Date: 2005
Pages: 19
Abstractor: As Provided
Reference Count: 25
ISSN: ISSN-0211-2159
Relative Luminance and Figure-Background Segmentation Problems: Using AMLA to Avoid Nondiscernible Stimulus Pairs in Common and Color Blind Observers
Jover, Julio Lillo; Moreira, Humberto
Psicologica: International Journal of Methodology and Experimental Psychology, v26 n2 p189-207 2005
Four experiments evaluated AMLA temporal version accuracy to measure relative luminosity in people with and without color blindness and, consequently, to provide the essential information to avoid poor figure-background combinations in any possible "specific screen-specific observer" pair. Experiment 1 showed that two very different apparatus, a sophisticated photometer and a common luxometer, provide equivalent measurements to compute: (1) screen gamma exponents and (2) relative luminance (Y/Yn) of achromatic but not of chromatic stimuli. Experiments 2, 3 and 4 showed that the psychophysical task of AMLA temporal version provided, for any stimulus type, accurate relative luminance measurements. They were: equivalent to standardised photometric measurements for common observers (Experiment 2); similar to the expected distortions for simulated (Experiment 2) and real (Experiment 3) aged tritanomalous observers; concordant with the expected distortions of protanope observers (Experiment 4). (Contains 3 tables, 3 figures and 1 footnote.)
University of Valencia. Dept. Metodologia, Facultad de Psicologia, Avda. Blasco Ibanez 21, 46010 Valencia, Spain. Tel: +34-96-386-4100; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A