What do alginate beads have to do with brain motion?

This is a brief note about an odd footnote in a thoughtful paper.

In a "Technical Note" last year in NeuroImage entitled "Functional imaging of the human superior colliculus: An optimized approach", Matthew B. Wall, Robin Walker, and Andrew T. Smith cite a 1992 paper by D. Poncelet et al., entitled "Production of alginate beads by emulsification/internal gelation".

Why? Well, presumably because they meant to cite the 1992 paper by B.P. Poncelet et al., on "Brain parenchyma motion: measurement with cine echo-planar MR imaging".

Same year, same first-author surname, but otherwise, rather different.

[Yes, people really do read citations!]