Genetic and environmental factors of individual differences in spatial recognition memoryстатья
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Аннотация:Spatial recognition memory can be defined as a process of comparison between the spatial characteristics of an object in memory storage and the stimuli presented to the sensory system. The aim of our study was to investigate genetic and environmental factors of variation in spatial recognition memory. The sample included 314 twin pairs (113 MZ, 201 DZ), aged from 10 to 17 years (mean age 12.8, SD 2.2) from Russia and Kyrgyzstan. We used the ‘‘Spatial recognition memory’’ (SRM) test from the battery of neuropsychological tests CANTAB eclipse. SRM is a test of spatial recognition memory in forced-choice paradigm. All test’s measures were adjusted for age and country. Latency parameters were logarithmically trans-formed. Cross-twin correlations of ‘‘Number correct’’ SRM measure were 0.169 for MZ and 0.170 for DZ. The individual differences in ‘‘Number correct’’ measure were explained by shared environmental (C = 17%) and non-shared environmental (E = 83%) effects (AIC = 1470.03;-2LL = 2718.03, p = 0.05). For ‘‘Mean correct latency’’ parameter the cross-twin correlations were 0.323 for MZ and 0.282 for DZ. Most suitable model was full model where A = 3%, C = 27% and E = 69% (within the accuracy of 1%, AIC =-1067.961;-2LL = 180.03, p = 0.713). While for ‘‘Mean incorrect latency’’measure cross-twin correlation was higher for MZ (0.405) than for
DZ (0.108). The model that included additive genetic (36%) and unique environmental effects (64%) showed the best fit for this measure (AIC =-228.549; -2LL = 239.451, p = 0.673). Thus, different measures of spatial recognition memory were associated with either additive genetic or common environmental factors with substantial impact of non-shared environment.