Transient lumanopia at high intensities.
Transient lumanopia is the loss of sensitivity to a flicker burst presented in early dark adaptation. We earlier reported that lumanopia with 18 Hz flicker was greatest after turning off 400 td adapting fields and progressively disappeared as the adapting field was intensified. We now report that lumanopia can occur with intense adapting fields, but only with faster flickers (e.g. 40 Hz, 5000 td fields). Dimming the field (but not brightening it) can also produce lumanopia. The results illustrate frequency-dependent attenuation by a temporal filter whose parameters are set by light adaptation and which change abruptly when the field is dimmed or extinguished.
Department of Psychology, Northeastern University, 125 NI, 360 Huntington Avenue, Boston, MA 02115, USA. reeves@neu.edu
Adam
A
Reeves
Shuang
S
Wu
D003623:Dark Adaptation / Q000502:physiology*; D005425:Flicker Fusion / Q000502:physiology*; D006801:Humans; D008029:Lighting; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D012684:Sensory Thresholds / Q000502:physiology