This study examines the influence of worker’s motivation on the intellectual concentration performances. An ACT-R cognitive models were adapted in this study to define the details of cognitive process. From the results of controlled participant laboratory experiment shows that the worker’s motivation affected the intellectual concentrations. In the high motivational conditions, participants performed faster while answering the task compared to the neutral condition. Two distinguished eye gaze movement patterns captured which indicating the different individual’s strategy in a certain condition and time duration. The results from this study might benefit future research on cognitive science in respect of different individual’s strategy and motivation.