'In 1885, Marey's associate Adolph-Moïse Bloch adapted a version of the intermittently-obscured lamps that William Henry Fox Talbot and Simon von Stampfer had developed during the 1830s to physiological investigation. Where Talbot sought to measure light intensity itself, Bloch sought to establish a law regarding the rates at which individual sensation-flashes produced a continuous light-sensation under different conditions (Bloch 1885, 493-495; Schickore 2006, 254-255). Such studies prompted a range of physiological investigations into Stampfer's 'stroboscopic' effects during the 1890s (e.g. Charpentier 1890; Schenck 1896; Marbe 1898).'