Loudness changes associated with the perception of an auditory after-image

Prior research has shown that auditory systems can experience threshold shifts after exposure to specific noise patterns. The Zwicker tone phenomenon occurs when broadband noise contains a spectral notch. This effect has been linked to changes in auditory thresholds, but less is known about suprathreshold effects. No prior work had resolved whether these threshold changes influence loudness perception. Existing studies focus on threshold shifts, not loudness. This gap motivated further investigation into perceptual changes. The current paper addresses this gap by examining loudness balance. The study compares loudness after notched and flat noise. It explores whether internal noise changes affect perception.

The aim was to determine if loudness perception changes after exposure to notched noise. The study focused on the Zwicker tone phenomenon and its suprathreshold effects. The researchers tested loudness balance using interaural comparisons. They compared probe tones presented after notched and flat noise. The goal was to identify if noise type influences loudness. This approach allows direct comparison of perceptual outcomes. The study aimed to link internal noise changes to loudness. It sought to confirm if internal noise affects auditory perception.

The study used an interaural loudness-balance procedure. Participants compared loudness of probe tones in each ear. Probe tones were presented after exposure to notched or flat noise. The procedure measured differences in loudness perception. The design controlled for noise type and intensity. The method allowed quantification of perceptual shifts. The researchers used broadband noise with a spectral notch. They compared low-intensity probe tones across conditions.

Results showed small loudness differences at low intensities only. Notched noise influenced loudness more than flat noise. These effects were limited to low-intensity probe tones. No significant differences were found at higher intensities. The findings suggest internal noise changes mediate perception. The influence was specific to low-intensity conditions. The results support the role of internal noise in perception. The effect was consistent with prior threshold shift findings.

The authors suggest that internal noise changes mediate perception. They propose that notched noise alters auditory centre activity. The findings indicate limited suprathreshold effects. The influence was specific to low-intensity probe tones. The results support the role of internal noise in perception. The study confirms that noise type affects loudness balance. The conclusions align with prior threshold shift findings. The authors propose that internal noise changes drive perception.