There are two elements to this field of study:
The first type of feeling of being watched is called the psychic staring effect (scopaesthesia).
a supposed phenomenon in which humans detect being stared at by extrasensory means. The idea was first explored by psychologist Edward B. Titchener in 1898 during a series of laboratory experiments that found only negative results. It has been the subject of contemporary attention by parapsychologists and fringe researchers, most notably Rupert Sheldrake.
The second type of feeling of being watched is called: The feeling of being watched, in english.
I could find no scientific studies that study if the feeling of being watched can arise from subliminally (unconciously) seeing someone watching you.
At this stage you can say that it has been disproved that humans can feel they are being watched in studies where the watcher is entirely imperceptible. There have been no studies that humans can get that feeling due to subliminial perceptions of being watched.
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Rupert Sheldrake, Papers on The Sense of Being Stared At. Accessed 2008-05-28.
David F. Marks and John Colwell (2000). The Psychic Staring Effect: An Artifact of Pseudo Randomization. Skeptical Inquirer, 9/1/2000. . Accessed 2010-15-5.
Lobach, E.; Bierman, D. (2004). "The Invisible Gaze: Three Attempts to Replicate
Sheldrake's Staring Effects" (PDF). Proceedings of the 47th PA Convention. pp. 77–90. Retrieved 2007-07-30.
Coover, J.E. 1913. The feeling of being stared at. American Journal of Psychology 24: 570-575.
Williams, L. 1983. Minimal cue perception of the regard of others: The feeling of being stared at. Journal of Parapsychology 47: 59-60.
Susanne Müller, Stefan Schmidt, Harald Walach (2009). "The Feeling of Being Stared at: A Parapsychological Classic with a Facelift". European Journal of Parapsychology 24.2: 117–138.
Sheldrake, Rupert (2003). The Sense of Being Stared At, And Other Aspects of the Extended Mind, London: Hutchinson. ISBN 0-09-179463-3.
Rupert Sheldrake (2005). The Sense of Being Stared At, and open peer commentary. Journal of Consciousness Studies, 12:6, 4-126.
David F. Marks and John Colwell (2000). The Psychic Staring Effect: An Artifact of Pseudo Randomization, Skeptical Inquirer, September/October 2000. Reprint. Accessed 2008-05-28.
Sheldrake, Rupert. "Skeptical Inquirer (2000)", March/April, 58-61
Michael Shermer (October 2005). Rupert's Resonance: The theory of "morphic resonance" posits that people have a sense of when they are being stared at. What does the research show? Scientific American, October, 2005. Reprint.