![\"Two](\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/855\/2018\/03\/23162353\/image11.png\")
<\/a> Figure 1<\/strong>.\u00a0Johansson and Hall wanted to know if people were more likely to notice a similar or dissimilar image when shown a picture they did not choose.[\/caption]\r\n\r\n1. How much time participants had to choose<\/p>\r\n
Participants were assigned to one of three timing conditions:<\/p>\r\n
- \r\n\t
- 2 seconds (very rushed)<\/li>\r\n\t
- 5 seconds (slightly rushed)<\/li>\r\n\t
- Unlimited time (free choice)<\/li>\r\n<\/ul>\r\n
If you had more time to inspect the faces, would you be more<\/em> likely to notice if you were handed the wrong one? That seems intuitive\u2014but the study tested it directly.<\/p>\r\n
2. How similar the two faces were<\/p>\r\n
Each pair of faces was either:<\/p>\r\n
- \r\n\t
- Similar (very alike in features)<\/li>\r\n\t
- Dissimilar (more noticeably different)<\/li>\r\n<\/ul>\r\n
You might predict that if the faces are very different, the swap would be obvious. But is that actually true?<\/p>\r\n
Results<\/h2>\r\n
With three time conditions and two similarity conditions, the researchers created six total conditions<\/strong>.<\/p>\r\n
If we put the two manipulated variables (time and similarity) together, that gives us six conditions:<\/p>\r\n\r\n[caption id=\"attachment_5013\" align=\"aligncenter\" width=\"512\"]
![\"Six](\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/855\/2018\/03\/23165302\/unnamed.png\")
<\/a> Figure 2<\/strong>. The six conditions of the experiment show that people were shown either similar or dissimilar faces, or given various amounts of time.[\/caption]\r\n\r\nIn the figure below, adjust the bars to fit your predictions about how often people would notice the picture switch. Higher bars mean people noticed that the cards had been switched.
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\r\nLower bars mean that people made one choice and didn\u2019t notice when they were given the wrong picture. This isn\u2019t easy because you need to take into account the two variables: (1) the amount of time looking at the pictures before your choice and (2) the similarity of the faces in the pictures.