Spontaneous eye blink rate and dopamine synthesis capacity: preliminary evidence for an absence of positive correlation.

As both age and gambling status are known to be related to Ki values (Berry et al ., 2016 ; van Holst et al ., 2017 ), we next regressed sEBR onto Ki values while adding these two variables as covariates, revealing a marginally significant negative relationship between sEBR and dopamine synthesis capacity (β = −1.82, P = 0.09).

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