P50 sensitivity to physical and psychological state influences.

@article{White2006P50ST,
  title={P50 sensitivity to physical and psychological state influences.},
  author={Patricia M. White and Cindy M. Yee},
  journal={Psychophysiology},
  year={2006},
  volume={43 3},
  pages={
          320-8
        }
}
Although P50 is described as a largely preattentive process, increasing evidence suggests that the psychological state of a participant may influence P50 and its suppression. A paired-stimulus paradigm was used to examine the contributions of variability in stimulus parameters and state factors, such as expectancy and vigilance, on P50. Results obtained from 34 healthy subjects indicate that stimulus intensity and background stimulus intensity influenced P50 amplitude whereas stimulus duration… 
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References

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