#31478 | AsPredicted

'Recognising emotions in chimps and dogs'
(AsPredicted #31478)


Author(s)
This pre-registration is currently anonymous to enable blind peer-review.
It has 2 authors.
Pre-registered on
11/20/2019 08:59 AM (PT)

1) Have any data been collected for this study already?
No, no data have been collected for this study yet.

2) What's the main question being asked or hypothesis being tested in this study?
H1. Participants are more likely to accurately recognise facial expressions of dogs, compared to chimpanzees.
H2. Participants who have experiences with dogs (familiarity) are more likely to accurately recognise emotions of dogs, compared to those who do not have experiences with dogs.

3) Describe the key dependent variable(s) specifying how they will be measured.
RT (reaction times to make decisions on which emotion), Accuracy (number of correct responses in deciding which emotion)

4) How many and which conditions will participants be assigned to?
For H1, 3 conditions- chimpanzee (encountering chimpanzee face pictures), dogs (encountering dog face pictures), human (encountering human face pictures)
For H2, 2 conditions- those who have owned a dog before, those who have not owned a dog before

5) Specify exactly which analyses you will conduct to examine the main question/hypothesis.
One-way ANOVA will be used to compare the RT and accuracy for main hypotheses and a follow up simple effect tests (t-test) to see whether the interaction is significant or not

6) Describe exactly how outliers will be defined and handled, and your precise rule(s) for excluding observations.
outliers will be identified through the box plots and any outliers will be excluded

7) How many observations will be collected or what will determine sample size?
No need to justify decision, but be precise about exactly how the number will be determined.

- 66 participants
- A priori power analysis was conducted using G*Power3 (Faul, Erdfelder, Lang, & Buchner, 2007) to test the difference within the group using a two-tailed test, a medium effect size (d = .50), and an alpha of .05. Result showed that a total sample of 66 participants was required to achieve a power of .80.

8) Anything else you would like to pre-register?
(e.g., secondary analyses, variables collected for exploratory purposes, unusual analyses planned?)

There will be 18 pictures for each condition: 6 happy faces, 6 angry faces and 6 neutral faces altogether there will be 54 trials

Version of AsPredicted Questions: 2.00