I want to have a cue/signal for performing a desired action. What kinds of visual cues should I have to avoid the inundation of any interference in the subject's performance. Words count as lexical cues, I don't regard them as visual cues per se.
If the monitor can install colored lights placed on the screen to represent a desired action. In that way the participant does not have to shift eye and relocate to the screen.
You might consider a small yellow arrow in the direction. In aviation air traffic is indicated on screens or cockpit displays. Having said that it would be beneficial to know other sensory I puts you have the participant contend with.
If I understand it well you want to have a cue/signal for performing a desired action. Let us suppose that you want to study a lot in order to do a written exam that is scheduled for Saturday morning, next week. A cue for you perform the intended action (e.g., to study a lot for a near exam) may be, for example, to have a calendar in your office such that, when you look at it, it remember you that your exam will take place, for example, within 6 days. This cue can be considered as a visual cue that functions, say, as a prospective or future-oriented memory. Note that to anticipate, through a psychical or mental cue, the occurrence of a certain event is the best way of dealing with the problems associated with the occurrence of such event, an exam situation, for instance. What kinds of visual cues should you have to avoid the inundation of any interference in your performance referred to above. In the example of a near exam situation mentioned above, in order to avoid visual cues that could interfere with your performance in the focal situation, we can think of black flags that signal that you have no party in the next few days. In the case of a virtual navigation task, you can have, for example, pink colored flags to represent the desired action (e.g, a virtual navigation task). It is not easy to imagine the least distracting non-verbal visual cue related to this task. Why not an empty space, such as an office without any book.
I hope I have got your question and that this helps.