Be Careful When Assuming the Obvious: Commentary on "The placement of the head that minimizes online memory: a complex systems approach"
This commentary points out flaws in a prior model, which is incremental as it builds on existing work without introducing new methods or data.
The paper critiques a mathematical model of word order evolution by highlighting that its foundational assumptions about memory costs are not supported by recent typological and psycholinguistic evidence, suggesting the need for further exploration.
Ferrer-i-Cancho (2015) presents a mathematical model of both the synchronic and diachronic nature of word order based on the assumption that memory costs are a never decreasing function of distance and a few very general linguistic assumptions. However, even these minimal and seemingly obvious assumptions are not as safe as they appear in light of recent typological and psycholinguistic evidence. The interaction of word order and memory has further depths to be explored.