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Leftside bias and Holistic effect in face recognition - Lab Report Example

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Summary to lab report on topic "Leftside bias and Holistic effect in face recognition"
Bias in psychological tasks such as "face recognition" has been given considerable attention over the past years. Several phenomena in this type of recognition make it more interesting: holistic effect, familiarity effect and left-side bias effect. Yet, researches concerning the effect of the aforementioned phenomena have been incongruous and inadequate…
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Leftside bias and Holistic effect in face recognition
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Extract of lab report "Leftside bias and Holistic effect in face recognition"

Download file "Leftside bias and Holistic effect in face recognition" to see previous pages... One hundred twenty trials were done for each orientation (Upright: Left or Right and Inverted: Left or Right), that is 120 upright images (60 adult and 60 baby images) and 120 inverted images (60 adult and 60 baby images) were shown to the participants. Group data was analyzed using T - test. Results showed a significant difference (p< 0.
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05) deviated from the null hypothesis of equal chance at the level of significant 0.05. There is a significant difference between answers of similarity to the stimulus 1 (original image) in the two groups (1st Group: Upright Images; 2nd Group: Inverted Images).
Participant's T-test (two tailed, independent sample) was performed to compare the mean probability of the study group with the null hypothesis (i.e. probability of the participants holding the left-left face as the original face whether the image is upright or inverted is 0.5).
In this study, 120 trials were done. Therefore to analyze the group data N = 60 was considered and to analyze individual data N = 120 was considered. For statistical calculations probability of null hypothesis was taken as 0.05.
To find out if there was any significant difference between the two groups in terms of chimeric face chosen (left-left or right-right) with respect to how the images are positioned (upright or inverted), an Independent T - test was done. Table 2 and 3 shows the results of the T - tests (also the Descriptive Analysis is shown).

Table 2 Descriptive Analysis




The Descriptive Analysis showed that greater than 50 percent of the participants chose a left-left chimeric face. This result is in resemblance of the 'left-side bias' observed by Hsiao and Cottrell (2009).

Table 3 T-test Results



The t-test results revealed a significant difference of participants choosing a left-left chimeric face on both upright and inverted images.





Discussion
This study was carried out to identify whether the orientation of images upon presentation has a significant effect on the decisions made participants of the facial likeness task. One hundred twenty trials were done for each orientation (Upright: Left or Right and Inverted: Left or Right), that is 120 upright images (60 adult and 60 baby images) and 120 inverted images (60 adult and 60 baby images) were shown to the participants.
Group data was analyzed using T - test. To find out if there was ...Download file "Leftside bias and Holistic effect in face recognition" to see next pagesRead More
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