Participants in the like condition indicated that they liked their people more, had more knowledge about them, and spent more time with these people than participants did in the dislike condition. 

Exp. 2 Results: Liking, Knowledge, and Time Spent Together (Alves et al., 2016)

Similarity was assessed using a distance measure; the distances between target persons in the liked condition were significantly  smaller than those in the disliked condition. Basically, liked others were perceived as being more similar to each other regarding their personalities than disliked others were. 

Exp. 2 Results: Similarity (Alves et al., 2016)

Participants were randomly assigned to a liked or disliked condition; they were instructed to make a similarity map for either 4 people they liked or disliked. Participants also indicated how much they liked, knew, and the amount of time typically spent with each person. 
This was done to see if liked targets only appeared more similar in experiment 1 solely because they were also in the presence of disliked individuals.

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We tend to have more knowledge about people we like compared to those that we dislike. Intuitively, one would think if we have more knowledge about various individuals we would see them as being more unique. However, research suggest this is not always true. This series of studies investigated if people tend to view liked others as more similar to themselves and others when compared to disliked others despite having more knowledge about them. 

My Friends Are All Alike: Liking and Similarity  

Asked participants to provide the names of 4 people they know well and liked as well as 4 people they knew, but did not like. They had to create a similarity map for these 8 individuals.  

Experiment 1; My Friends Are All Alike

Alves, H., Koch, A., & Unkelbach, C. (2016). My friends are all alike—the relation between liking and perceived similarity in person perception. Journal of Experimental Social Psychology, 62, 103-117.

My Friends Are All Alike

Participants listed 4 people that they liked and 4 that they disliked. Similarity among the liked and disliked others was assessed using pairwise ratings on a 1-9 scale to questions such as "How similar are Liked Person 1 and Liked Person 2 to each other regarding their personalities?”. Participants also indicated how much they liked, knew, and how much time they spent with each person.

Experiment 3; All My Friends Are Alike

Participants were instructed to think of as many traits as they could for each of the 4 liked and disliked individuals; additionally, they were asked comparison questions such as "How similar are Disliked Person 1 and Disliked Person 2 to each other in terms of __?" Similarity among the individuals was then assessed using the pairwise functions. Participants also were instructed to indicate how much they liked, knew, and how much time they spent with each person. 

Experiment 4; My Friends Are All Alike

Investigates how similar we perceive liked people and disliked when we don't know them very well (e.g. public figures and celebrities). Participants provided the names of 4 liked and 4 disliked celebrities. They were asked questions such as "How similar are Disliked Celebrity 1 and Disliked Celebrity 2 to each other in terms of __?" They also reported how much they knew and liked each individual. 

Experiment 5; My Friends Are All Alike

This investigated the impacts of ratings of larger groups of liked and disliked people would have on the similarity levels. They predicted that by asking participants to think of many celebrities, they would be more likely to pick a diverse set of people; thus, influencing how similar they were all to each other. They asked participants to think of 12 celebrities they liked and disliked; however, only 4 of each were randomly selected for the participants to make comparison ratings about (e.g. Celebrity 1 is more sociable than Celebrity 2).  

Experiment 6; My Friends Are All Alike

This experiment asked people to indicate 2 people that they know personally (did not have to be exclusively liked or disliked). They were then asked to identify either as many positive or negative traits as they could about each one. Afterwards, they were asked how similar they were to one another.  

Experiment 7; My Friends Are All Alike

A similarity map is used to assess how similar people are to each other. Participants drag the names of the participants closer to each other if they think they are more similar to each other. Jimi, Tom, Frank, and Keith are all similar to each other, but Frank and Tom are the most similar. Mary and Emily are similar to each other, but different from everyone else. 

Similarity Map

Similarity was assessed using a distance measure. They found that the mean distance among the liked individuals was significantly smaller than the distance between the disliked individuals. In other words, the participants thought the people they liked were  more similar to each other than a disliked person was to the other disliked individuals. 

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