Posner Cueing Paradigm in Augmented Reality Environment

Abstract: Posner Cueing Task is an experiment to investigate the eect dierent type of stimulis could have on the visual attention. This master thesis aimed to implement a Posner Cueing Task in an Argumented Reality using a integrated eye tracker. The thesis were divided into two distinct parts. One part to write code for synchronisation and communication between Microsoft Hololens and Tobii eye tracker. One part to use this framework and devices to implement and run a Posner cueing task with subtle cues. The synchronisation was carried out using the UDP protocol sending data packages over the tobii network. As the tobii glasses were specially modied to t onto the Hololens the camera had been removed. This caused the need to be able to calibrate the eye tracker without the normal use of the front camera. A task that showed to be possible to solve by providing a digital calibration marker to the eye tracker. The communication between the two devices were implemented and worked as expected with a fairly low latency. The Posner Cueing Task were then implemented and deployed to the Hololens glasses using Unity and Visual Studios. The eye tracker broke just before the experiment were to be carried out. The code had to be adapted to not use the eye tracker. The experiment were then carried out with only the hololens as a input device. The test result showed that a subtle cue had a similar eect of the participants attention as a high contrast cue. The experiment also showed that a valid cue, one that showed at the same side as the target, yield a lower RT than an invalid cue, one showed at the opposite side of the target. Cue-target onset asynchronies is the time between that the cue dissapeared and the target appears. This varied from 50ms to 650ms, where the lower ones had a positive eect on the RT. The eect decreased with time and yield a negative eect for 650ms CTOA.