Abstract
Olfaction, as a semiotic modality, receives relatively less attention than other sensory modalities. However, chemiosemiosis and semiochemicals are fundamental components of zoosemiosis, occurring across animal taxonomic groups. Indeed, olfaction is thought to be one of the most ancient sensory modalities from an evolutionary perspective and significantly, even unicellular organisms, such as the bacterium Escherichia coli, utilize a form of chemiosemiosis when foraging for nutrients, as part of a process known as ‘chemotaxis’. Further, many taxonomic groups have evolved to produce dedicated ‘semiochemicals’ (often known as pheromones or allomones) which have the sole purpose of being diffused into the environment as a social signal. In this paper, I highlight the importance of Umwelt theory when studying animal communication, by reviewing the less conspicuous and intuitive chemiosemiotic modality, across animal taxa. I then go on to discuss chemiosemiosis within a linguistic framework and argue that complex pattern recognition underpins linguistic theory. Thus, I explore the concept that chemiosemiosis has features in common with language, when the factor of time, in the transmission and decoding of a signal, is taken into account. Moreover, I provide discursive evidence in support of a unified theory of sensory perception, based on structural and functional aspects of signal transmission and cognitive complex pattern recognition. I conclude by proposing a chemosemiotic hypothesis of language evolution.