Technique for controlling a human machine interface

A method of controlling a human machine interface (HMI), the method comprising:

• outputting, using the HMI, a predefined criterion applicable to each of a plurality of physical objects in a first task, wherein each of the plurality of physical objects is associated with a category within a group of at least two pairwise disjoint categories and the predefined criterion is fulfilled for each physical object associated with a first category within the group of categories and the predefined criterion is not fulfilled for each physical object associated with a second category within the group of categories,
• wherein the controlling of the HMI for the first task comprises repeatedly performing the steps of:
• rendering, using the HMI, a physical object out of the plurality of physical objects;
• monitoring the HMI for an input during a predefined first time period after the rendering of the physical object;
• and
• updating a first metric comprising a first sub-metric and a second sub-metric indicative of a performance measurement in the first task,
• wherein the first sub-metric of the first metric is increased if the input is received within the first time period and if the displayed physical object fulfills the predefined criterion,
• wherein the first sub-metric of the first metric is increased if the input is absent within the first time period and if the displayed physical object does not fulfill the predefined criterion,
• wherein the second sub-metric of the first metric is decreased if the input is received within the first time period and if the displayed physical object does not fulfill the predefined criterion, and
• wherein the second sub-metric of the first metric is decreased if the input is absent within the first time period and if the displayed physical object fulfills the predefined criterion;
• and
• rendering, using the HMI, a plurality of receptacles each enclosing one of the plurality of physical objects for a second task,
• wherein the controlling of the HMI for the second task comprises repeatedly performing the steps of:
• rendering a physical object out of the plurality of physical objects at any one of the receptacles for a predefined second time period;
• selectively rendering, using the HMI, a cue at the rendered physical object within the second time period;
• monitoring the HMI for an input responsive to the rendering of the physical object within the second time period;
• and
• updating a second metric comprising a first sub-metric and a second sub-metric indicative of a performance measurement in the second task,
• wherein the first sub-metric of the second metric is increased if the input is received within the second time period at the position of the selectively rendered cue,
• wherein the first sub-metric of the second metric is increased if the input is absent within the second time period and if no cue was selectively rendered,
• wherein the second sub-metric of the second metric is decreased if the input at the position of the physical object is received within the second time period and if no cue was selectively rendered, and
• wherein the second sub-metric of the second metric is decreased if the input is absent within the second time period and the cue was selectively rendered.