The effects of aging and musicianship on the use of auditory streaming cues

Auditory stream segregation, or separating sounds into their respective sources, and tracking them over time is a fundamental auditory ability. Previous research has separately explored the impacts of aging and musicianship on the ability to separate and follow auditory streams. The current study evaluated the simultaneous effects of age and musicianship on auditory streaming induced by three physical features: intensity, spectral envelope and temporal envelope. In the first study, older and younger musicians and non-musicians with normal hearing identified deviants in a four-note melody interleaved with distractors that were more or less similar to the melody in terms of intensity, spectral envelope and temporal envelope. In the second study, older and younger musicians and non-musicians participated in a dissimilarity rating paradigm with pairs of melodies that differed along the same three features. Results suggested that auditory streaming skills are maintained in older adults but that older adults rely on intensity more than younger adults while musicianship is associated with increased sensitivity to spectral and temporal envelope, acoustic features that are typically less effective for stream segregation, particularly in older adults.

Sound Source Mechanics and Musical Timbre Perception: Evidence From Previous Studies

Timbre has been conceived of as a multidimensional sensory attribute and as a carrier of perceptually useful information about the mechanics of the sound source. To date, research on musical timbre has focused on defining its acoustical correlates, whereas fragmentary evidence is available on the influence of mechanical parameters. We quantified the extent to which mechanical properties of the sound source are associated with structures in the data from published identification and dissimilarity-rating studies. We focus on two macroscopic mechanical properties: the musical instrument family and excitation type. Identification confusions are significantly more frequent for same-family instruments. With dissimilarity ratings, same-family or same-excitation tones are judged more similar and tend to occupy the same region of multidimensional-scaling spaces. As such, significant associations between the perception of musical timbre and the mechanics of the sound source emerge even when not explicitly demanded by the task.

Contextual correlates of meaning

The relation between similarity and dissimilarity of meaning and similarity of context was analyzed for synonymous nouns. New semantic similarity and dissimilarity rating tests with an empirically determined series of linguistic anchors and conventional, arbitrarily anchored semantic similarity ratings were compared. Contextual similarity was elicited by a sorting test based on substitution and yielding d-primes. The study found reliable correlations between the d-primes and the different ratings for semantic similarity and dissimilarity of the synonymous nouns across a wide continuum of meaning. The data strongly supported a contextual hypothesis of meaning. The data endorsed the claim that people abstract a contextual representation from experiencing the multiple natural linguistic contexts of a word. Semantic similarity and dissimilarity rating formats with an empirically chosen series of linguistic anchors and a sorting test of contextual similarity yielded stronger support for a contextual hypothesis than did alternative methods of eliciting lexical and contextual similarity.