LATTICE EXTRACTION BASED ON SYMMETRY ANALYSIS

A system and apparatus for visually cuing a human subject wherein an incandescent lamp or lamps (40, 41) are energizable to provide a source of visible illumination. These incandescent lamps have a predetermined rise and fall characteristic. An observation surface (12) is positioned for confronting illumination from the lamps (40, 41) including a pattern through which filtered light of a first intensity may pass, which pattern is configured for visually conveying information to the subject. The pattern is surrounded by a region (54) opaque to illumination, that region extending to a periphery (55). A peripheral surface arrangement (14, 16) is provided extending from the observation surface (12) periphery and is positioned for confronting and transmitting illumination from the lamps (40, 41) at a second intensity selected as greater than the first intensity. Lamps (40, 41) are illuminated to effect the transmission of illumination through the peripheral surface and observation surface in an intermittent fashion at a frequency selected to provide visual stimuli of predetermined temporar pause, p, to evoke a gamma effect with respect to human visual perception of the pattern.