Hormones and Evolution - Ronay and Von Hippel (The Skateboard Testosterone Study)

Alternative Study: Zak et al

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Ronay and von Hippel (2010) Study on Testosterone, Risk-Taking, and Attractiveness

Testosterone: Testosterone is a hormone associated with various physiological and behavioral processes, including aggression, dominance, and risk-taking behavior. It is known to influence how individuals assess and engage in risky activities.

Aim:

Ronay and von Hippel (2010) aimed to determine if men would engage in greater risk-taking behavior in the presence of an attractive female compared to a male researcher. They hypothesized that increased risk-taking in the presence of an attractive female could be explained by intrasexual selection, where men may increase their risk-taking to impress potential mates. Additionally, the study sought to explore whether testosterone played a role in this behavior.

Procedure:

Participants:
- The sample consisted of 96 young adult Australian male skateboarders with a mean age of 21.58 years.
- Participants were recruited at skateboard parks.
Experimental Conditions:
- Participants were randomly assigned to either the male-researcher condition (43 participants) or the female-researcher condition (53 participants).
Experimental Design:
- Repeated Measures Design: Participants performed one “easy trick” and one “difficult trick” (which they could complete approximately 50% of the time) and were asked to attempt each trick 10 times. After a break, participants performed 10 additional attempts of each trick in front of either the male researcher or an attractive 18-year-old female researcher.
- Independent Samples Design: The order of researcher (male or female) in the second set of attempts was different for each group, allowing for comparison between behaviors in different contexts.
Manipulation and Measurement:
- Testosterone Levels: Saliva samples were collected after the experiment to measure testosterone levels.
- Heart Rate: Participants wore a Nordic sports watch to measure heart rate before and throughout the task.
- Attractiveness: The attractiveness of the female researcher was established by having 20 male raters view photos of potential female experimenters.
- Behavioral Measurement: Skateboarders’ attempts were coded for one of three outcomes: success, crash landing, or aborted attempt. High levels of aborted attempts indicated lower risk-taking.
Testing Time:
- Tests were conducted between 2 and 6 PM to control for time-of-day effects.

Results:

Risk-Taking Behavior:
- Participants exhibited greater risk-taking behavior (i.e., fewer aborted attempts) on the difficult tricks in the presence of the attractive female researcher compared to the male researcher.
Testosterone Levels:
- Testosterone levels were significantly higher in participants who performed in front of the female researcher than those who performed in front of the male researcher.
Heart Rate:
- No significant difference in heart rate was observed between the two groups, indicating that cardiovascular arousal did not vary significantly between conditions.

Conclusion:

The study showed that young men are more likely to engage in risky behaviors in the presence of an attractive woman and that increased testosterone levels may account for this behavior. This finding supports the theory of intrasexual selection, where increased risk-taking serves as a signal of health, strength, and dominance, potentially enhancing attractiveness to potential mates.

Evaluation and Research Design:

Strengths:
- Controlled Variables: The study controlled for several factors including the attractiveness of the female researcher, time of day, and heart rate, which helped enhance the study’s internal validity.
- Ecological Validity: Conducted in naturalistic settings (skateboard parks), which increased the generalizability of the findings to real-world situations.
- Repeated Measures Design: This design controlled for individual differences and allowed for comparisons within the same participants across different conditions.
Limitations:
- Order Effects: The repeated measures design could be influenced by order effects such as fatigue or practice, which may affect risk-taking behavior.
- Standardization of Tricks: The difficulty of the tricks could not be standardized across groups, which may question the validity of using "aborted attempts" as a measure of risk-taking.
- Intrasexual Selection: Although the study suggests a link between risk-taking and attractiveness, it is challenging to definitively establish that reproduction is the primary motivation for the observed behavior.
- Ethical Considerations: Participants were not informed of the true nature of the study (i.e., observing mating behavior), which could be seen as misleading or potentially embarrassing. Participants should have been debriefed and given the option to withdraw their data post-study.