Unfortunately, I cannot access specific excerpts from articles. However, I can help you make a logical inference about why yawns might be contagious based on general scientific understanding.
One common theory is that contagious yawning is related to social bonding and empathy. This is supported by the observation that it tends to occur more frequently among individuals who share strong social connections. If an individual sees another yawn, they may subconsciously mimic the behavior as a way to synchronize their emotional state or enhance group cohesion. Therefore, the tendency for yawns to be contagious could imply an underlying biological drive to promote social bonding within groups, making the inference both logical and valid.
If you provide the text from the article, I can help analyze it further!