Tilt illusion: Cortical Hyper excitability

Tilt illusion is a transient misperception of the visual image as tilted on its side or even upside down.

Regression Analysis

Multiple regression was run to predict PSE (Tilt illusion)  from CHi index scores and spatial frequencies in 3.0 CPD discomfort rating. There was linearity as assessed by partial regression plots. Independence of residuals, as assessed by a Durbin-Watson statistic of 1.722. There was also homoscedasticity, as assessed by visual inspection of a plot of residuals versus predicted values. Lack of evidence of multicollinearity, as assessed by tolerance values greater than 0.1.

There were no residuals greater than +/-3 standard deviations, no leverage values greater than 0.2, and values for Cook’s distance above 1. The assumption of normality was met, as assessed by a Q-Q Plot. R2 for the overall model was 6% with an adjusted R2 of 5.8%, a small size effect according to Cohen (1988). However, CHi index scores and spatial frequencies in 3.0 CPD discomfort rating did not statistically predict PSE, F(2, 16) = 5.04, p = .610.

Tilt Illusion Questions

-Briefly recap your introduction -What are your main findings?

Results are not significant (see results) -Did you answer your hypothesis? What went well? -What were your limitations? – Issues with participant coding, had to match experiment with questionnaire by using date and time, Participants didn’t complete the experiment due to lengthiness or tediousness of the task. Lost a lot of participants due to skewed results

-How can this improve?

-What future research could be done?

-Your main takeaway points?

-What have you learnt from the tilt illusion experiment?

-What does this mean for the field?

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