Table 1. The stimulus sentences used in acoustic measurements

Number	Sentence
1	The top of the world is a wintry wonderland.
2	The ocean is surrounded by frozen ground.
3	There are few people or trees, but to polar bears, the Arctic is home.
4	Polar bears have thick fur, huge paws and other features that make them well prepared for life in their harsh environment.
5	In fact, they need the Arctic sea ice for survival.