Modeling human visual processing within and beyond the oculomotor range using ACT-R cognitive architecture

The Active Control of Thought-Rational (ACT-R) cognitive architecture model has limitations in the broad visual world because both head movements and eye movements are generated beyond the oculomotor range. Thus, this paper describes the model of visual processing in the broad visual world by considering gaze shifts during orienting the movements to targets within and beyond the oculomotor range, which was developed using both the revised Eye Movements and Movement Attention (EMMA) module and the head module. The model in this study can predict the latency of human visual processing and describe the following two human behaviors. First, gaze shift has been mainly affected by eye movement when the target is in the oculomotor range. Second, gaze shift has been mainly affected by head movement when the target is outside of the oculomotor range. Consequently, in the domain of the broad visual world, the model in this study is able to predict human visual processing more accurately than the existing visual processing models such as the EMMA model.