Related Experiment Video
Updated: Feb 11, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
Published on: August 18, 2020
Pilot study of relationship between fertility risk and bargaining
Margery M Lucas1, Elissa Koff, Susan Skeath
1Department of Psychology, Wellesley College, Wellesley, MA 02481, USA. mlucas@wellesley.edu
Abstract:
Competition for resources to support a healthy pregnancy and later offspring was likely very important for ancestral women. Therefore, it was predicted that women evolved a propensity for intrasexual competition over resources during times of their highest conception risk. To investigate this hypothesis, women played a series of ultimatum games, bargaining games that test participants' willingness to share a monetary stake. During periods of high conception risk, intrasexual competition increased as evidenced by lower offers to share a stake with others as well as higher rates of rejection of offers.
Related Concept Videos
Fertilization
Ending Relationships
Pilot and Numeric Relaying
Relationship Formation
In Vitro Fertilization
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...
Relative Risk

