Before revision: We propose a Active Walker Model for the movement of individual under the feedback of a time-dependent pheromone field . It is assumed that the sole feedback mechanism is tropotaxis: ants can sense the gradient of the pheromone concentration field and adjust their orientation accordingly.
After revision: We propose a Active Walker Model for the movement of individual under the feedback of a time-dependent pheromone field that feedbacks into the motion ants through tropotaxis: individuals can sense the gradient of the pheromone concentration field and adjust their orientation accordingly.