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I understand the difference in concept; YがXを向ける = "Y turns X", and ZがYにXを向けさせる
= "Z makes Y turn X". But in practical usage with 注意を~, I can't tell the
difference. Do native speakers just use them interchangeably?

Below are both example sentences from
[alc.co.jp](https://eow.alc.co.jp/search?q=%e5%90%91%e3%81%91%e3%81%95%e3%81%9b%e3%82%8b):

> ~に (人) の **注意を向けさせる** : bring ~ to the attention of

> ~に (人) の **注意を向ける** : direct someone's attention to ~

Same particles, and basically the same English translation. There is also a
sentence in a Japanese grammar book I'm reading about the sentence-ending
particle よ:

> 「よ」の基本的な機能は聞き手の知らないことに **注意を向けさせる** ことにあると言えます。

How would the meaning change if 向ける were used here instead?
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question
grammar nuances verbs conjugations causation
注意を向ける vs. 注意を向けさせる - same meaning?
1. 私は黒板に彼の注意を **向けた** 。
  2. 私は黒板に彼の注意を **向けさせた** 。
  3. 私は彼に黒板に注意を **向けさせた** 。

These are basically interchangeable. In Sentence 1, the speaker directly drew
his attention to the blackboard (his attention was moved by 私). Sentence 2 is
more indirect; the speaker made him to direct his attention to the blackboard
(his attention was moved by 彼 because 私 asked him to do so). Sentence 3 is a
slightly modified version of Sentence 2; now you can see the agent (causee),
彼, is explicitly marked by another に.

There is no significant difference between them, but Sentence 1 may tend to
sound like the speaker directly drew his attention e.g., by tapping the
blackboard, whereas Sentence 2 & 3 tend to sound like the speaker asked him,
"Hey look at the blackboard".

Sentence 3 has two に's in succession, which is not wrong but not very nice,
either. If you care, remember you can always replace 黒板に to 黒板 **へ** :

  1. 私は黒板へ彼の注意を **向けた** 。
  2. 私は黒板へ彼の注意を **向けさせた** 。
  3. 私は彼に黒板へ注意を **向けさせた** 。
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As is stated in the question, it seems to me that 注意を向けさせる and 注意を向ける are
sometimes used interchangeably. But when preceded by（だれだれ）の, this makes their
use more restricted shown in the following examples.

? 私は その美しい花に 彼女の注意を向けさせた。(sounds unnatural because of the causative verb
向けさせる)

私は その美しい花に 彼女の注意を向けた。(most natural in these four sentences)

＊私は 彼女に その美しい花に 注意を向けた。(彼女に concords only with the causative verb 向けさせる)

私は 彼女に その美しい花に 注意を向けさせた。(grammatical but sounds a little awkward because of
two に)
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answer