• Dominant theme: loudness perception and recruitment as core psychoacoustic phenomena, comparing thresholds and loudness growth for pure tones and speech, with adaptation effects and clinical implications [1] [2] [3] [20] [13].

• Cochlear physiology and neural correlates: investigations into microphonics, hair cell adaptation, cochlear innervation, and cortical representations, integrating guinea pig models with human psychoacoustic findings [4] [16] [8] [7] [14].

• Audiometric thresholds and hearing tests: development and validation of threshold measurements, phoneme and speech-based assessments, and objective audiometry approaches for reliable hearing evaluation [12] [15] [6] [17].

• Binaural vs monaural processing and loudness summation: early work quantifying binaural thresholds, monaural vs binaural differences, and their implications for perceived loudness [18] [19] [17].

• Trauma and recovery: effects of strong acoustic stimulation, stimulation deafness, and cochlear histology on thresholds, with recovery dynamics and damage assessment across head injuries and loudness recruitment studies [9] [10] [11].