Baseline reference for BOLD measurement was the last \SI{4}{\s} of the fixation period following the video presentation.
Experimental Design
A repetition suppression (RS) paradigm was created based on previous work by \citet{Thioux2015}. Stimuli were presented in four \SI{7}{\minute} runs, with each run consisting of the presentation of 20 stimuli sets. Each set was composed of a fixation cross (\SIrange{8}{12}{\s}), a ready prompt (\SI{2}{\s}), a task prompt (\SI{3}{\s}), and four videos of \SI{2}{\s} each (see \cref{fig:aim2stimuli}). Task prompt text was salient to the object and task which was to be presented, for example, ``Clean the plate'' was displayed before video of reaching for a plate. In order to assess the effects of repetition suppression on brain areas, sets of video consisted of the same video repeated four times, or of two different videos repeated twice. Alternating videos had either a different end-effector (e.g. intact and prosthesis), or different object with similar semantic meaning (e.g. paper plate and stoneware plate). The various stimuli sets were grouped into contrasts for statistical analysis of BOLD and RS effects. The contrasts were: intact same object, intact alternating object, prosthesis same object, prosthesis alternating object, and alternating intact / prosthesis with the same object.