请问这是 as 引导的啥从句?属于什么语法现象?

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这是 as 引导的状语从句 是时间状语从句
原句有误 应该是 As brain scientists plumb the neurology of an afternoon at the mall,they are discovering measurable differences between the brains of people who save and those who spend with abandon,particularly in areas of the brain that predict consequences,process the sense of reward,spur motivation,and control memory.

as此处是连词，在…期间, 当…时候。并列句。