Pupil-BLAH-metry: cognitive effort in speech planning reflected by pupil dilation
Attention Perception & Psychophysics (2012) - Comment
pubmed: 22231605  doi: 10.3758/s13414-011-0263-y  issn: 1943-393x  issn: 1943-3921 

Megan H. Papesh, Stephen D. Goldinger