DATA SET 4: Mike Land's Tea Making Data SetEXPERIMENT DESCRIPTION
Fig 1: Prints from (a) the activity video, and (b) eye-movement video of the same instant, when the sweetener is dropped into the mug. The head-mounted camera and backpack are shown in (a). In (b) the white dot is the direction of regard of the fovea (into the mug). The eye can be seen in the bottom third of the frame, with a bright ellipse fitting the iris. The angular width of upper part of the frame is approximately 35 deg. Note that (b) is right-left reversed compared with (a) because of the mirror in the camera system
Fig 2: Record of the fixations made by three subjects during the first sequence after the kettle is first detected (0.05 - 0.20 on Fig 3), and during which the kettle is moved from the worktop (left) to the sink (right). Because of the changing viewpoint, the angular relations are only approximate, but fixation positions relative to the objects of regard are accurately represented. Note the associations of fixations with particular objects or other entities - kettle, sink, kettle and lid, taps, water stream - which correspond in time to the actions that relate to them. Note also the rough correspondence in the numbers of fixations that are devoted by each subject to corresponding objects: this gives a good idea of the degree of similarity in scan paths expected when different subjects address the same task.
Fig 3: Records of the actions of the trunk, gaze and hands during the first minute of a four minute tea-making sequence. Typically each ‘object related action’ involves a movement of the body (e.g. from one work surface to another) followed by a gaze shift to the next object to be manipulated, followed by the manipulation itself. This sequence is particularly clear between 0.05 and 0.1 and 0.35 and 0.4 s. The delays involved (trunk-gaze, gaze-manipulation) are typically about 0.6 s. Gaze often moves to the next object in the sequence about half a second before manipulation of the last object is complete, implying that some guidance information is retained in a buffer.
SCANPATH (EYE-TRACKER) DATA