Question

みみ

下から2行目のfor the visionの所の構文がわからないです。ここの文の文構造を教えて頂きたいです。

A new study has discovered that heightened blood flow activity within
certain regions of the brain could help explain the great dreamer divide. In
general, dream recall is thought to require some amount of wakefulness during
the night for the vision to be encoded in longer-term memory. But it is not
(a)
known what causes some people to wake up more than others.

Answer 1

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ののののの

for the visionが直後のto be encodedの意味上の主語になっています。
for〜memoryまでのまとまりがその前の部分にかかるto不定詞の副詞的用法です。