Just Noticeable Gender Experiment

Decent Essays

A total of 49 participants (35 female, 13 male) were perception students and/ or friends or family of those students who have volunteered to participate in a pilot study measuring the proportion of muscularity of male figures presented in two different body orientation either upright or inverted. The age and standard deviation of the participants were not recorded in this experiment.
The independent variable of this experiment was the two body orientation of the male figures: upright and inverted, which were measured in arbitrary units. Additionally, a dependent t-test was conducted to measure the Just Noticeable Difference (JND) and Point of Subjective Equivalence (PSE), which in our case was the dependent variable.
…show more content…
Therefore, this is how the PSE for body orientation was attained.
A within subject design was used and dependent samples t-test was employed to analyse the results. This experiment was completed on a MacBook Pro using the software DAZ 3D Studios (Cafri, G., & Thompson, J. K, 2004), which was generated through OpenSesame (Mathod, S., Schreij, D., & Theeuwes, J, 2012).
All stimuli were coloured-scale 3-D male figures projected on a grey background, created with Daz3D studio (Cafri et al., 2004), which was generated through the program OpenSesame (Mathod et al., 2012). Images were displayed on a 13-in. laptop with 1024 x 768 pixel resolution. For both the inverted and upright bodies the image height of the male figures were 103 pixels and remained on the screen until a keyboard response was detected, which was either ‘z’ for scrawny or ‘m’ for muscular. Once a response was recorded there were 500ms in between each figure.
…show more content…
In this particular experiment, level 10 indicates a scrawny male whilst 100 represent an extremely muscular figure. Additionally, there were 20 trials per level of muscularity for both upright and inverted body orientation, which were randomly presented throughout the experiment.
A dependent t-test was conducted to measure the JND, and PSE for the different body orientations. Three outliers were eliminated from the experiment to maintain reliability since these participants were recognised for randomly selecting ‘z’ or ‘m’ without accurately identifying whether the body was indeed muscular or scrawny. Therefore, the analysis was performed on the remaining participants.
The JND (M =21.44, SD = 13.05), in the inverted condition was greater compared to the upright condition (M= 19.18, SD = 11.46) refer to table 1. However, the PSE in the inverted condition was lower (M= 48.22, SD = 13.60), than the upright condition (M= 49.62, SD= 12.47) refer to table 2. A one-tailed repeated measures t -test was employed to analyse the results and indicated a statistical difference (p = <. 05) between the PSE in the inverted and upright condition, t (45) = 0.841, p = .203. On the other hand, JND t (45) = 1.839, p =. 036 indicate no statistical difference between the inverted and upright
Get Access