So sad I almost memorized 18 random digits perfectly in less than 2 seconds

[Chump]

There is an interesting thread on this forum regarding a “synesthesia training program” which is worth a read.

Synesthesia Training Program (Letters and Numbers)

Check this out: Pseudo-Synesthesia through Reading Books with Colored Letters Methodology/Principal Findings Non-synesthetes were given specially prepared colored books to read. A modified Stroop task was administered before and after reading. A perceptual crowding task was administered after reading. Reading one book (>49,000 words) was sufficient to induce effects regarded as behavioral markers for synesthesia. The results of the Stroop tasks indicate that it is possible to learn letter-colo…