
Disciplines wax and wane often for incidental reasons. Three examples: statistics, human vision research, adult developmental psychology… 
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Adult developmental psychology also ended in the early 1990s. There were strong results, exciting open questions, and good methods. The studies under way in the late 80s, which should have answered key questions, were never published.
Did they get null or ambiguous results?Show this thread -

Theory and evidence suggested that some adults have qualitatively different, and superior, cognitive capacities to others. Tremendous potential if these could be trained (as I think they can, and hope to help show how).Show this thread -

Evidence was that these capacities are unevenly distributed demographically. This could be taken as reason to find ways to enhance cognitive development in disadvantaged groups. Instead, I suspect it was too politically hot, and everyone exited the field. 3︎⃣Show this thread
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Being fascinated by tetrachromacy in particular, I feel this is a real shame.
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That *is* a fascinating phenomenon! I’ve read a little about it, but don’t know what research has happened in the past couple decades. Do you?
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Human vision research appears to have ended around 1990 (based on a recent two-day-long literature search). That’s when I finished my PhD and stopped following the field.
What happened? There were exciting open questions, and good methods for addressing them.