I think colechristensen had a test for episodic memory. Such a test is not included in the Wechsler intelligence scales (currently WAIS-IV for adults, WISC-V fo

I think colechristensen had a test for episodic memory. Such a test is not included in the Wechsler intelligence scales (currently WAIS-IV for adults, WISC-V for older children), but tests for working memory are. Simplified, working memory are that limited number of items you can keep in mind, until you are disturbed or thinks about something else. Episodic memory is what you still remember after your thoughts are disturbed, and what you may remember for 10 minutes or 50 years. Surprisingly, episodic memory is not closely related to IQ and is, thus, not included in intelligence tests. What colechristensen seems to describe is that his learning was hampered by an attention deficit, but he was able to retain the information in his episodic memory when he eventually registered it.