⑥Is Google really wrecking our memory? The answer is “it depends.” The Columbia University report doesn’t offer evidence of actual memory diminishing. Instead, the suggestion is that, influenced by Internet and search engine use, our memories are switching job hats and becoming more external. Instead of remembering “ends,” we’re remembering “means.” Search engines like Google are simply becoming extensions of our brains, sort of like wireless electronic devices. 

The phrase “job hats” in Paragraph 6 refers to （）.