While I don't have access to the specific excerpt from the article you mentioned, I can help guide you in making a logical inference about why yawns are contagious based on common scientific understanding.
From various scientific discussions on the topic, one could infer that yawns are contagious due to their social and empathetic nature. Research indicates that seeing someone yawn can trigger the same response in others, suggesting a link to social bonding and the mirroring of behaviors. For example, if the article mentions how yawning can occur more frequently in social groups or how individuals with closer emotional ties are more prone to mimic yawns, this would support the idea that contagion arises from social connections. Thus, the reasoning is logical as it connects human behavior and social interaction with physiological responses such as yawning, illustrating a broader understanding of empathy and neuroscience.
Feel free to provide specific text or points for a more tailored response!