Figure 3: | Scientific Reports

Figure 3

From: Differences in cognitive functions between cytomegalovirus-infected and cytomegalovirus-free university students: a case control study

Figure 3

The model explaining the paradox of seemingly higher intelligence in CMV infected subjects and positive correlation between the concentration of anti-CMV antibodies and IQ. The concentration of anti-CMV antibodies fluctuates in time and differs between subjects depending on many genetic and environmental factors, however, statistically, the level of these antibodies decreases with time from the infection in young people (see the lowest graph). In parallel, the intelligence of infected subjects decreases with time due to unknown cumulative effects of the chronical infection. Due to these two processes, the infected subjects with the lowest intelligence have also the lowest level of antibodies and many of them therefore score negatively in ELISA test (upper part of the figure). Therefore, the mean intelligence of CMV-seropositive subjects is higher than that of CMV-seronegative subjects (who represent the mixture on CMV-free and CMV-very-long-infected subjects).