When listening to degraded speech, such as speech delivered by a cochlear implant, listeners make use of top-down linguistic knowledge to facilitate speech recognition. Lexical knowledge supports speech recognition and enhances the perceived clarity of speech. Yet, the extent to which lexical knowledge can be used to effectively compensate for degraded input may depend on the degree of degradation and the listener’s age. The current study investigated lexical effects in the compensation for speech that was degraded via noise-vocoding in younger (...) and older listeners. In an online experiment, younger and older normal-hearing listeners rated the clarity of noise-vocoded sentences on a scale from 1 to 7. Lexical information was provided by matching text primes and the lexical content of the target utterance. Half of the sentences were preceded by a matching text prime, while half were preceded by a non-matching prime. Each sentence also consisted of three key words of high or low lexical frequency and neighborhood density. Sentences were processed to simulate CI hearing, using an eight-channel noise vocoder with varying filter slopes. Results showed that lexical information impacted the perceived clarity of noise-vocoded speech. Noise-vocoded speech was perceived as clearer when preceded by a matching prime, and when sentences included key words with high lexical frequency and low neighborhood density. However, the strength of the lexical effects depended on the level of degradation. Matching text primes had a greater impact for speech with poorer spectral resolution, but lexical content had a smaller impact for speech with poorer spectral resolution. Finally, lexical information appeared to benefit both younger and older listeners. Findings demonstrate that lexical knowledge can be employed by younger and older listeners in cognitive compensation during the processing of noise-vocoded speech. However, lexical content may not be as reliable when the signal is highly degraded. Clinical implications are that for adult CI users, lexical knowledge might be used to compensate for the degraded speech signal, regardless of age, but some CI users may be hindered by a relatively poor signal. (shrink)

‘The Gift’ is the English title of a small book first published in French in 1925 by sociologist Marcel Mauss, which catalyzed an ongoing debate linked to a wide range of scholarship. Mauss’s gift theory included the Māori example of the ‘hau of the gift’ which Mauss explained as a spiritual force, seeking to return to its original owner or place of origin. This article brings a critical Māori perspective to Mauss’ notion of the hau of the gift, in an (...) indigenous philosophical response to Eurocentric social science that combines critical discourse analysis with Kaupapa Māori theory and principles of research. The paper introduces Mauss’ arguments about gifting, and the role of hau in those arguments, before turning to a close examination of the concept of ‘hau’ as presented in the original Māori letters, the primary data used by Elsdon Best to write his anthropological articles, from which Mauss developed his ideas about hau. These letters, which sparked the whole debate, are material artefacts of the cross-cultural educational relationship between Tamati Ranapiri as teacher, and Elsdon Best as student. Common-sense Māori readings of Ranapiri find no mystery in what he wrote about hau, but reinforce the significance of his correspondence, from the perspective of Kaupapa Māori versions of the history of Māori education. (shrink)