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At high pitch, the story changes significantly. Peak levels of EMG were above 60% of the MVC. This represents a physically demanding task. For the four short onsets, a clear pattern existed – first onset lower and remaining three higher – one that may be explained in terms of the individual‘s technique. Notably, the period of rest for the high frequency trial, showed lower values than the periods of rest for the other two ―easier‖ ones (low and medium). Further, the part of the trial where a tone was sustained began with an onset of about 40% of MVC and gradually increased to peak levels of the short onsets as the breath of the singer was expended.

Harmon (Webpage of the University of Chicago, 2006). Until the 20th century, affective representations of human movement are the norm. Developments in technology – the advent of photography – inspire some of the most profound changes in 2-D image-making. Photographic techniques were employed by both scientists and artists. The work of Edward James Muybridge may have been scientific investigations, but they had a huge impact on the art world. Muybridge used multi-camera stop action photography (Figure 21 and 22) and multiple exposure techniques (Figure 23) to initiate a scientific approach to human movement studies (Cavanagh, 1990; Solnit, 2003).

The work of Edward James Muybridge may have been scientific investigations, but they had a huge impact on the art world. Muybridge used multi-camera stop action photography (Figure 21 and 22) and multiple exposure techniques (Figure 23) to initiate a scientific approach to human movement studies (Cavanagh, 1990; Solnit, 2003). Further developments using photography to capture and analyze human movement can be found in the work of: 1) Etienne-Jules Marey, who worked with high-speed photography at the same time as Muybridge, capturing multiple images with one camera on one photo plate (Braun, 1992); 2) Wilhelm Braune and Otto Fischer, who created elaborate 3-D models and performed thorough gait analyses using 4 cameras and subjects marked with Geissler tubes which emitted current that could then be seen on film (Cavanagh, 1990); 3) Nikolaj 40 Gongbing Shan and Peter Visentin Bernstein, who developed precise kinematic procedures using cyclography, a technique employing film that was slowly moving through a camera with a mirror placed at a 45 degree angle to the optical axis, thereby creating a picture that gave a frontal and lateral view of the subject (Medved, 2001); and others – using techniques such as strobes, multiple and time exposure (Plagenhoef, 1971).

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