价值-项目间隔和项目呈现时间对价值导向元记忆的影响*

采用选择性任务范式，用2个实验考察价值-项目间隔和项目呈现时长对价值导向元记忆的影响。实验1考察不同价值-项目间隔（无, 1s, 2s）时被试的选择性记忆指标SI和记忆成绩。结果发现，随价值-项目间隔增加，被试的记忆选择性逐渐下降，间隔1s时对高价值项目的选择性仍存在，但间隔2s时消失；实验2选取实验1的两种价值-项目间隔（无, 1s）条件，延长其项目呈现时间至4.5s，考察项目呈现时间对价值导向元记忆的影响。结果发现，两种价值-项目间隔条件下记忆选择性水平（SI）均显著降低，但对高价值项目的选择性加工优势并没消失。结论：价值导向元记忆受价值-项目间隔和项目呈现时间的影响。

The Influence of Value-Item Interval and Item Presentation Duration on Value-Directed Metamemory

In the present study, two experiments with selective task paradigm were conducted to investigate the influences of value-item interval and item presentation duration on the effect of value-directed metamemory. Experiment 1 explored whether different value-item intervals ( 0s, 1s, and 2s) would affect selectivity index ( SI) and memory performance. Results showed that the value-directed metamemory was still existed on 1s interval condition but disappeared on 2s interval condition. Experiment 2 inspected whether the item presentation duration would influence the value-directed metamemory further. Two conditions with value-directed selectivity from Experiment 1 were used with expanded longer item presentation duration ( 4.5s) . Results showed that the SIs descended significantly in both two conditions. However, the memory performance of high-value items and low-value items both increased with the item presentation duration increasing, which showed a separation phenomenon between metamemory and memory. In conclusion, value-directed metamemory is affected by both value-item interval and item presentation duration.