ytime. They were then asked to complete a PSI or a Psychological Screening Inventory, a health checklist, and an informal hearing test to check for heating deficits. Each participant was then asked to identify 75% of the words at 20 dB with background noise of 40 dB. Then after all these preliminaries, each participant was chosen on the basis of adequate hearing, absence of obvious psychiatric and medical disorders, and absence of medications affecting alertness or gross physiological function.
             The results from all of this preparation ended up being that when all the experiments and trials and data were collected and calculated that it appeared participants were able to identify change in stimulus quality at 30 dB levels. However, it also appeared that over time participants developed an increased likelihood to report a message present, regardless of any stimulus level. Eventually, a bias to report a presence of stimulus developed over timed trials and across decibel levels, regardless of presence or absence of message: The accuracy of "no&quo
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