PsychophysicsSensory ThresholdsSensory AidsDiscrimination (Psychology)Photic StimulationRefractory Period, PsychologicalVisual PerceptionDifferential ThresholdForm PerceptionMotion PerceptionContrast SensitivityPattern Recognition, VisualModels, PsychologicalVision, LowDepth PerceptionSignal Detection, PsychologicalReadingPerceptual MaskingVisual CortexColor PerceptionModels, NeurologicalOrientationVision TestsAuditory PerceptionFixation, OcularPerceptionVision, OcularVisual PathwaysSense of CoherenceVisual FieldsVision DisparityCuesAcoustic StimulationVision, BinocularElectroretinographyDiscrimination LearningReaction TimeAttentionVisual Field TestsVisual AcuityMagnetic Resonance ImagingBrain MappingSense OrgansPsychomotor PerformanceTime FactorsNeuronsRNA, Antisense