Final answer:
Groupthink is the element of negative group synergy that was presented during the course lecture. It refers to the modification of opinions within a group to align with what is believed to be the group consensus, often leading to faulty decision-making.
Step-by-step explanation:
The element of negative group synergy that was presented during the course lecture is Groupthink.
Groupthink refers to the modification of the opinions of members of a group to align with what they believe is the group consensus. This phenomenon occurs when the group takes actions or makes decisions that individuals would not typically perform outside the group setting. It often leads to faulty decision-making and the elimination of diverse opinions.