Please stop using digits in speech captchas, try large vocabulary instead. Use music on background, not simply noise (and very diverse music, singe melody can be easily learned). Or, better, don't use captchas at all, they are really annoying and do not protect anything.
The critical issue is to design a flow of information into human brain which will both allow to scan though extremely large amounts of data and deduct new meanings. Text/speech is indeed quite slow channel for that, vision might be reasonable.
Visualization seems relevant if we want to keep human intelligence instead of replacing it with pure computer intelligence. Works like LargeVis
Visualizing Large-scale and High-dimensional Data
by Jian Tang, Jingzhou Liu, Ming Zhang, Qiaozhu Mei
are much more important then. See also the LargeVis project on github.
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