Background Previous reports have described that simple cognitive training using reading aloud and solving simple arithmetic calculations, so-called “learning therapy”, can improve executive functions and processing speed in the older adults. Nevertheless, it is not well-known whether learning therapy improve a wide range of cognitive functions or not. We investigated the beneficial effects of learning therapy on various cognitive functions in healthy older adults. Methods We used a single-blinded intervention with two groups (learning therapy group: LT and waiting list control (...) group: WL). Sixty-four elderly were randomly assigned to LT or WL. In LT, participants performed reading Japanese aloud and solving simple calculations training tasks for 6 months. WL did not participate in the intervention. We measured several cognitive functions before and after 6 months intervention periods. Results Compared to WL, results revealed that LT improved inhibition performance in executive functions (Stroop: LT (Mean = 3.88) vs. WL (Mean = 1.22), adjusted p =.013 and reverse Stroop LT (Mean = 3.22) vs. WL (Mean = 1.59), adjusted p =.015), verbal episodic memory (logical memory: LT (Mean = 4.59) vs. WL (Mean = 2.47), adjusted p =.015), focus attention(D-CAT: LT (Mean = 2.09) vs. WL (Mean = -0.59), adjusted p =.010) and processing speed compared to the waiting list control group (digit symbol coding: LT (Mean = 5.00) vs. WL (Mean = 1.13), adjusted p =.015 and symbol search: LT (Mean = 3.47) vs. WL (Mean = 1.81), adjusted p =.014). Discussion This RCT can showed the benefit of learning therapy on inhibition of executive functions, verbal episodic memory, focus attention, and processing speed in healthy elderly people. Our results were discussed under overlapping hypothesis. Trial registration “This trial was registered in The University Hospital Medical Information Network Clinical Trials Registry (UMIN000006998).”. (shrink)

Reconsideration-proofness is a solution concept proposed by Kocherlakota :33–54, 1996) for infinite horizon single-player problems in which time inconsistency is important. Kocherlakota’s definition has a limitation: it is not applicable to environments with state variables. The limitation is important because many time-inconsistent problems have state variables. This paper displays a natural generalization of reconsideration-proofness to environments with state variables, and shows that it leads to nonexistence in three examples. Such nonexistence contrasts with the general existence theorem obtained in environments without (...) state variables in Kocherlakota. In the first two examples, existence can be recovered with a modification in the solution concept. In the last example, nonexistence occurs even with the modified solution concept. Insights about further research are derived from these nonexistence results. (shrink)