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Fig. 11 Analysis of visual thresholds by the escape response behavioral test. Wild-type (WT) adults (minimum 12 months of age; n = 10) have a visual threshold of 6 log units below unattenuated light (log I = -6), which is consistent with published results (Li and Dowling, [1997]). Visual thresholds of heterozygous dazed siblings were elevated at least 0.8 log units to an average absolute threshold of log I -5.2 with a large variation (SD = 0.9) when tested as a population (n = 13). Visual thresholds were elevated by at least 2 log units (log I > -4.0) in heterozygous fish that were identified as night blin