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Memory load changes what the pupils reveal about listening effort.
What is it about?
We studied how background noise and memory load affect listening effort by tracking pupil size. When people must remember more digits, memory demands can override the usual pupil response to changes in speech intelligibility.
Why is it important?
It shows that pupil size does not purely reflect listening effort from noise or intelligibility: memory demands can change or mask this effect. This is relevant for researchers and clinicians who use pupillometry to assess listening effort in hearing and cognitive tests.