Stereotyped view of others:
The victims of groupthink are so closed minded that they have created stereotypes for the opposition, of anyone who has a different opinion than them. They often consider the ‘enemy group’ as weak, stupid, wrong, vulnerable or immoral.
Type III: Pressures toward uniformity
Pressure on Dissent:
The victims of groupthink often start pressurizing those with a different opinion to concur to their decision. They start to coerce those who question the validity of their argument or the stance preferred by most. Since there is a reasonable social cost attached to disagreeing with the group, people often with a different viewpoint remain silent.
Self-Censorship:
When certain members of the decision-making group begin censoring themselves and restrain from voicing their opinions, they have become a victim of groupthink. They stay silent so as not to deviate from the generally accepted ‘apparent’ group consensus and also to silence themselves so as to reduce the importance of their own doubts and counter-arguments.
Illusion of Unanimity:
People victim of groupthink often conjure up illusions of unanimity regarding judgements made by majority of the group. This symptom is caused partially due to the silence from other group members, which is taken as agreeing with the popular decision. That popular decision is supported by each team member as they are only focusing on the common points supporting the decision. This is done at the expense of complete exploration of variations that might cause them to rethink their decision.
Mind-guarding:
Last type of symptoms is mind-guarding. When a certain group of people become in-charge of guarding the minds of others in the group, they are a victim of mind-guarding and groupthink. Those people are practicing selective listening and only relaying information which is going to support the majority’s point of view. They will try to hide any adverse information that may be destructive for facts concerning appropriateness of the decision.
别人的刻板鉴于：
群体思维的受害者是如此封闭的头脑，他们已经创建了反对派的刻板印象，谁比他们有不同的意见的人。他们往往认为弱的，愚蠢的，错误的，脆弱的或不道德的’敌群。
III型：走向均匀的压力
反对压力：
群体思维的受害者往往开始加压同意他们的决定有不同意见。他们开始强迫那些人质疑他们的论点的有效性或最首选的立场。由于不同意与该组有一个合理的社会成本，人们往往用不同的观点保持沉默。
自我审查：
当某些决策组成员开始审查自己和限制表达他们的意见，他们已经成为一个群体思维的受害者。他们保持沉默，以免偏离普遍接受的“明显的”群体共识，也是自己保持沉默，从而减少自己的怀疑和反驳的重要性。
幻觉的一致同意：
人群体思维的受害者往往想起了一致判断由本集团大部分的幻想。部分原因是由于从其他小组成员的沉默视为同意与流行的决定，这是造成这种症候。那流行的决定是由每个团队成员的支持，因为他们只专注于支持决策的共同点。这样做是在完整的勘探费用的变化，可能会导致他们重新考虑他们的决定。
守着心灵：
最新型的症状是守着心灵。当某一群人成为负责守卫组中的其他人心目中，他们是受害者的心态保护和群体思维。那些人练习选择性倾听和唯一的传递信息，这是要支持广大的观点。他们会试图隐藏任何不良信息，可能是破坏性的有关决定适当的事实。
