Suprathreshold Red-Green Temporal Responsiveness Across the Visual Field

Abstract

Two pulses of different hues, red and green, are delivered in succession. The task consists in matching their brightnesses, at various eccentricities, and under different degrees of defocus. Although highly skilled, our observers exhibit a ‘training’ effect, in that the red source appears increasingly brighter than the green one, in subsequent sessions. The dependence on presentation order represents one of the difficulties met in the photometric specification of perimetric tests. The duration of our pulses (800 ms) is probably not long enough to apply a ‘steady state’ photometry. The implications in perimetric testing with interruped light (e.g. flash-and-recovery-cycle technique) still wait elucidation.