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. 2015 Apr 9:9:191.
doi: 10.3389/fnhum.2015.00191. eCollection 2015.

Imaging the passionate stage of romantic love by dopamine dynamics

Affiliations

Imaging the passionate stage of romantic love by dopamine dynamics

Kayo Takahashi et al. Front Hum Neurosci. .

Abstract

Using [(11)C]raclopride, a dopamine D2/D3 receptor antagonist, we undertook a positron emission tomography (PET) study to investigate the involvement of the dopaminergic neurotransmitter system when subjects viewed the pictures of partners to whom they were romantically attached. Ten subjects viewed pictures of their romantic partners and, as a control, of friends of the same sex for whom they had neutral feelings during the PET study. We administered [(11)C]raclopride to subjects using a timing for injecting the antagonist which had been determined in previous studies to be optimal for detecting increases in the amount of dopamine released by stimulation. The results demonstrated statistically significant activation of the dopaminergic system in two regions, the medial orbitofrontal cortex (mOFC) and medial prefrontal cortex, the former of which has been strongly implicated in a variety of rewarding experiences, including that of beauty and love. A positive correlation was obtained in mOFC between excitement levels and dopaminergic activation only in the love but not in the control condition.

Keywords: dopamine; medial prefrontal cortex; orbitofrontal cortex; positron emission tomography (PET); romantic love.

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Figures

Figure 1
Figure 1
Paradigm for the PET experiments (A) showing stimulus display sequences (B). In order to allow for release of endogenous dopamine, the visual stimuli were presented 15 min before [11C]raclopride administration and lasted for 30 min. A PET scan was conducted for 60 min after the [11C]raclopride administration. Each partner's or friend's picture was presented for 15 s, followed by a baseline blank epoch for 15 s.
Figure 2
Figure 2
Decreased BPND by viewing loved partners' pictures. Statistical parametric maps of BPND in the medial orbitofrontal cortex (mOFC) and medial prefrontal cortex (mPFC) in the love condition (Control minus Love) (A) and graphs to show the peak value of the binding potential within the cluster (BPND) in these regions of each subject (B). The mean and standard deviation is shown in (B) and the P values resulted from statistical analysis by two-tailed paired t-test.
Figure 3
Figure 3
Correlation between subjective excitement levels and BPND. Correlation between visual analog scale (VAS) values for excitation produced by viewing partners' (left) and friends' (right) pictures, and the BPND in the OFC during the love and control condition, respectively. Pearson's coefficient value and Pvalue are shown. Note the absence of a correlation in the right panel.

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