Mechanisms of high-frequency song generation in brachypterous crickets and the role of ghost frequencies

Sound production in crickets relies on stridulation, the well-understood rubbing together of a pair of specialised wings. As the file of one wing slides over the scraper of the other, a series of rhythmic impacts cause harmonic oscillations, usually resulting in the radiation of pure tones delivered at low frequencies (2-8 kHz). In the short winged crickets of the Lebinthini tribe, acoustic communication relies on signals with remarkably high frequencies (> 8 kHz) and rich harmonic content. Using several species of the subfamily Eneopterinae, we characterise the morphological and mechanical specialisations supporting the production of high frequencies, and demonstrate that higher harmonics are exploited as dominant frequencies. These specialisations affect the structure of the stridulatory file, the motor control of stridulation and the resonance of the sound radiator. We place these specialisations in a phylogenetic framework and show that they serve to exploit high frequency vibrational modes pre-existing in the phylogenetic ancestor. In Eneopterinae, the lower frequency components are harmonically related to the dominant peak, suggesting they are relicts of ancestral carrier frequencies. Yet, such ghost frequencies still occur in the wings' free resonances, highlighting the fundamental mechanical constraints of sound radiation. These results support the hypothesis that such high frequency songs evolved stepwise, by a form of punctuated evolution which could be related to functional constraints, rather than by the progressive increase of the ancestral fundamental frequency

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Reconsidering the Mind/Body Distinction: Towards a Continuist Ontology of Consciousness

In his paper, “The State and Fate of Contemporary Philosophy of Mind,” John Haldane likens the present condition of Philosophy of Mind to that of the philosophically stultifying period of late scholasticism, where naming took the place of explaining, and philosophy was reduced to taxonomy. Haldane argues that our current physicalistic lexicon has made it virtually “impossible to accommodate the basic features of mindedness revealed in reflection and direct experience.” For Philosophy of Mind to progress, Haldane argues, we must “make space” for alternative modes of knowing that exist beyond the bounds of our current, overly physicalistic terminology