An electronic device is provided that includes a user-interface feature, a detection mechanism and one or more internal components. The system includes a communications network for passing messages between computers connected thereto, a plurality of computers connected to the network for running programs thereon including at least first and second autonomous agents. A related item display component receives a user selection of at least one of the one or more tags and displays one or more items related to the displayed email based at least in part upon the user selection. The identified anomalies may then be used to help guide searches for invalid clicks. The method further includes analyzing the distribution of response times for the subject to determine variability in anticipatory timing of the subject with respect to the stimuli, and generating a subject feedback signal corresponding to a result of the analyzing so as to train the subject to improve anticipatory timing of the subject. The real material handling system, in turn, can provide data regarding system operation which may be fed back to the virtual material handling system to control its function.