We conclude that this might be useful for very early assessment of people at risk, people with FEP, and people with schizophrenia. Other variables also showed differences between FEP and HC, and FEP were always more intolerant to such pure frequency sweeps than HC. Results showed that ascending sine pure frequency sweeps ( p < 0.01) and descending sine pure frequencies sweeps ( p < 0.01) caused the maximum discomfort in FEP. ![]() The level of discomfort was estimated by the participant by making a mark across a continuous line whose extremes read “nothing bad” (left) and “too bad” (right). Sixteen frequency sweeps varying in modulation envelopes (sawtooth, sine), order (ascending, descending), duration (4s, 8s), and range (50–8000 Hz, 2–8 kHz) were presented randomly, but always in the same sequence, to FEP and healthy controls (HC). Sixteen people diagnosed with FEP, participated in the experiment. In the present study, we investigated hearing discomfort/tolerance to 16 given sound streams. Awareness of perceptual and sensory changes that might occur in visual, auditory, proprioception, and other senses, in the early stages towards the First Episode Psychosis (FEP), and their subsequent sensorial evolution as the disturb progresses deeper into an acute episode, might be a key element for interrupting the process.
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