The pooling of excitation in threshold bar stimuli.
D000221:Adaptation, Ocular; D000328:Adult; D006801:Humans; D008954:Models, Biological; D009433:Neural Inhibition; D009474:Neurons / Q000502:physiology; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology; D012160:Retina / Q000166:cytology / Q000502:physiology*; D014785:Vision, Ocular