Introduces a topic that the previous statement brings to mind, meaning 'speaking of' or 'when it comes to'. It lets the speaker pick up a word just mentioned and develop it, often adding a typical association. といったら can also express strong emotion about something extreme.
[Noun / Plain phrase] + というと / といえば / といったら
京都というと、やっぱりお寺を思い浮かべる。
Kyouto to iu to, yappari otera wo omoiukaberu.
Speaking of Kyoto, temples are what come to mind.
京都 + というと picks up the topic and offers its typical association.
夏といえば、花火大会が楽しみだ。
Natsu to ieba, hanabi taikai ga tanoshimi da.
When it comes to summer, I look forward to fireworks festivals.
夏 + といえば raises the topic and links it to a common image.
あの時の嬉しさといったら、言葉にできないほどだった。
Ano toki no ureshisa to ittara, kotoba ni dekinai hodo datta.
As for how happy I was then, it was beyond words.
嬉しさ + といったら here conveys an extreme, emotional degree.
• といえば is the most neutral 'speaking of'; というと can add 'if you mention X, then...' logic. • といったら often expresses an extreme emotional degree ('so ~ that words fail'). • Used to smoothly shift or develop a conversation topic.
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ~というと/といえば/といったら is tested against.
について neutrally states 'regarding X', while というと/といえば pick up X as a trigger and add an association or reaction.
Compared to plain といえば, the といったら form more strongly conveys emotional emphasis about how extreme something is.
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