Hormones and Behavior. Hormones Modulate Behavior Hormones Can Be Necessary for a Behavior A particular level of hormone in an animal does not insure a behavior will occur. A particular level of hormone does not have the same effect in every animal. Hormones. Environment. Nervous System.
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Voles: A Comparative Model
Prairie and Meadow Voles
Males and Females
Parental or Naive
for Vasopressin Receptor
Fig. 2. OT levels and standards errors for DM2s with and without an
intention to trust. In the Intention condition, DM1s voluntarily transfer
money to DM2s. In the Random Draw condition, the transfer from DM1s to
DM2s was determined by a public draw of a numbered ball. OT levels
across conditions are statistically different at P < 0.05.
P.J. Zak et al. / Hormones and Behavior 48 (2005) 522–527
Figure 2 | Transfers in the trust and the risk experiment. Each observation
represents the average transfer amount (in MU) over four transfer decisions
per investor. a, Relative frequency of investors’ average transfers in oxytocin
(filled bars) and placebo (open bars) groups in the trust experiment
(n ¼ 58). Subjects given oxytocin show significantly higher transfer levels.