In the case of sensorineural hearing loss, the cochlear mechanism is modified and the active phenomena linked to the hair cells are altered. If the effects on decreased sensitivity, frequency selectivity, or speech in noise intelligibility are well known, the perception of pitch can also be altered following a neurosensory hearing loss. This thesis proposes to study the perception of pitch with four approaches in subjects with neurosensory hearing loss. The first study focuses on diplacusis and has shown that this phenomenon is much more frequent than one could imagine. The results showed that perception was generally higher on the worse ear. The second study proposes a categorical measure of pitch. The results showed that for the same frequency, the hearing-impaired perceived a sound higher than the normal hearing listeners. The third study is about octave matching and listening to music. The results show that hearing loss correlates with the octave matching frequency. The fourth study focuses on the categorical perception of voiceless fricatives. The results show that the categorical boundary is shifted towards the low frequencies, which seems to reflect a higher perception of these phonemes. These results of psychoacoustic experiments are consistent with the studies carried out on animals showing a modification of the cochlear tonotopic map and the characteristic frequencies of the neurons in case of a neurosensory hearing loss. These observations could lead to better care for the hearing impaired and to the development of new algorithms on future hearing aids