The COCOHA project revolves around a need, an opportunity, and a challenge. Millions of people struggle to communicate in noisy environments particularly the elderly: 7% of the European population are classified as hearing impaired. Hearing aids can effectively deal with a simple loss in sensitivity, but they do not restore the ability of a healthy pair of young ears to pick out a weak voice among many, that is needed for effective social communication.
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The inferior colliculus (IC) integrates a variety of inputs to perform spectrotemporal processing in the primary auditory pathway, including temporal to rate transformations. The temporal to rate transformations occurring in the IC make it important to understand how the auditory pathway is able to adapt to changes in hearing abilities, such as due to aging or noise-induced hearing loss.
It is well known that the perception of stimuli depends strongly on spatial and temporal context. One clear example of temporal contextual effects is serial dependency, the influence of preceding stimuli on the perception of current stimuli in a sequential display.
Pitch perception is important not only for the enjoyment of music and for the perception of prosody in speech, but also for our ability to process one sound, such as a voice, in the presence of competing sounds.
Memory and perception must be closely linked for hearing. Imagine trying to follow an animated conversation in a busy restaurant. Being able to detect changes from the ongoing context is a useful skill, to realize that a new talker has just joined in. Another useful skill is being able to recognize the voice of a given individual, to understand who just said what. Unfortunately, we do not know how these memory-like processes operate, or even on which acoustic features they depend. This is a major hole in our fundamental understanding of auditory perception.