Figure 1.

Stimulus and schematic of tasks. Thirty-two locations were probed (4 eccentricities × 8 polar angles). The observer's task was to position the response probe diagonally across the reference probe, while maintaining fixation on the fixation cross. The reference and response probes were viewed through red–green filters matched to their spectral profile; thus, each probe was viewed by a separate eye. Stimuli were flickered to counter interocular suppression in amblyopic observers. Viewed through the filters, the background and stimuli appeared gray.