Auditory Discrimination based on P300 component.

This study focuses on analyzing the electrophysiological and perceptual attention response to six auditory variants (frequency, intensity, and spatiality). Two ranges are used for each parameter: frequencies of 500 Hz and 1000 Hz, intensities of 60 dB SPL and 67 dB SPL, and spatialities of 0º and 90º. The aim is to measure the Event-Related Potential (ERP) and the attention given to the changes between differences in acoustic parameters, in addition to comparing responses across three different stimuli. The justification is based on previous research and standards such as ISO 15006, highlighting the importance of understanding cognitive responses to variations in auditory alerts, especially in vehicular contexts. This knowledge is crucial, as evidenced in studies by the Office of Research, Development, and Technology and the U.S. Department of Transportation. The importance of this study lies in its potential to aid in the design of more effective auditory alerts in critical contexts, such as vehicular safety. The experimental procedure requires an initial audiometry to determine auditory thresholds and meet the inclusion criteria (participants must score a value under 20 dB to ensure they don’t have hearing loss), followed by registering the subject's basal state (which lasts 1 minute) and then exposing them to a series of sounds under controlled conditions (lasting 3 minutes each). In three distinct stages, participants listen to 180 sounds, including 144 frequent sounds and 36 infrequent sounds in each stage, varying in frequency, amplitude, and spatiality in an oddball paradigm. The sequence of these infrequent sounds was randomized. Participants were instructed to count the infrequent sounds they listened to, and to press a key on the keyboard upon detecting each one. After each stage, participants completed a questionnaire, which consists of 6 questions, taking approximately 1 minute maximum and is done between each experimental condition. This questionnaire is taken from a part of the Auditory Processing Domains Questionnaire to determine how many infrequent sounds they detected and assess their level of attention during the experiment. The main hypothesis suggests that an increase in the acoustic characteristics of the sound will generate a more significant attentional response, expecting a P300 amplitude increase. This study is an effort to understand how acoustic variations in auditory alerts may affect cognitive and attentional processes, a field of great relevance in vehicular safety and user interface design.