Application settings:

Select a variable: Angle of input line Gap Rotation Line size Within each research performed, you can vary only one variable. All other settings are fixed within that research. For each of the 3 remaining settings (parameters) that are entered in the form of multi-line plain-text editing control (textarea), the first entered valid value is set (starting from the first line to the bottom). If all values are invalid or not entered, the default value for that variable is set.

Number of iterations for each variable value: Total number of items = (number of iterations) * (number of entered valid values for the selected variable)

Angle of input line:Enter only one integer value in the range of 30-60 per line. Units are degrees. The input angle changes meaning in the case of rotation. Do not enter units. Invalid values will be deleted (ignored). If all values in the list are invalid, default value = 45. The size of the gap between a fixed and a moving line: Enter only one integer value in the range of 1-25 per line. Higher value-larger spacing and vice versa. Units are arc angle degrees. Do not enter units. Invalid values will be deleted (ignored). If all values in the list are invalid, default value = 3. Rotation angle value:Enter only one integer value in the range of 0-180 per line. Units are degrees. Do not enter units. Invalid values will be deleted (ignored). If all values in the list are invalid, default value = 0. The classic Poggendorff illusion does not use rotation. If you set this value other than 0 degrees, the entire screen image will be rotated by the value of the selected angle. Eg. by rotating 180 degrees you get a mirror symmetrical image. By rotating by 90, the vertical lines become horizontal. Line size : Enter only one integer value in the range of 50-100 per line. It is entered as a percentage of the maximum possible line size allowed by the screen resolution you are using. 100 = the maximum possible value allowed by your screen resolution. Smaller values = smaller line size. Invalid values will be deleted (ignored). If all values in the list are invalid, default value = 100. Colors. Note: if you change the default colors, synchronize the colors. Some colors in demo mode are fixed (green).

Background color during task:

Font color (base font) during the task:

Font color for a line that is scrolling:

Font color for a scrolling line when dragged with the mouse:

Gap type: space gap between the 2 lines in the middle will have the color of a base pencil both gap lines are visible smaller part of gap line along the fixed line and entire gap line along the moving line is visible bigger part of gap line along the fixed line and entire gap line along the moving line is visible only the gap line along the fixed line is visible only the gap line along the scrolling line is visible both gap lines are invisible

Pen width (all lines): The larger the width of the pen, the larger and clearer all stimulus lines are. Recommended value is 1 (default).

Draw an outer circle around all the stimuli: No

Enable backward - display the button for the previous item: Yes

Progress bar is visible: Yes. It will be displayed how many items are left to the end.

Demo mode: Off

Click the Validate button to check all entered values. Caution: This action deletes all unnecessary lines for variables that are not currently in use. If no valid values are entered, default values will be set.

Storage (useful for group research):

Storage: No Yes This web application will not store results within your web browser. Data is lost when the browser tab is closed

There are no saved results in your web browser.

Your browser probably doesn't have support for the Web Storage Object or access to the Storage Object is disabled. Check your browser settings. In some browsers (example: IE11) Storage Object is not enabled when accessed in a local file (offline).

Latest research

Select data:Results by items Descriptive statistics-px Descriptive statistics-% Inferential statistics - correlations

Legend:

px = pixels. % = percents

Variables = Combination of variables used for bivariate correlation

Spearman-ro = Spearman's rank correlation coefficient. Spearman’s formula with tied ranks was used

t-value ro = Student's t-distribution (Gosset) value argument for ro

df = Degree of freedom (Student's t-distribution)

p-ro (two-sided) = Two-tailed probability or cumulative distribution function (CDF) for t-value ro

Pearson r = Pearson correlation coefficient.

t-value r = Student's t-distribution (Gosset) value argument for r

p-r (two-sided) = Two-tailed probability or cumulative distribution function (CDF) for t-value r

NaN = If printed NaN cannot be calculated. Example if sample variance = 0 for Pearson r or Spearman-ro.

If the value in the table is not printed, it cannot be calculated.

All statistics are automatically calculated for n>2 (only for non-missing items). Ignore or at least very carefully use inferential statistics for small sample size.

Sample standard deviation is calculated with Bessel's correction (n-1)

Table of group results:

m-px = Average (mean) for total error (px)

sd-px = Sample standard deviation for total error (px)

m-% = Average (mean) for total error (percents)

sd-% = Sample standard deviation for total error (percents)

r-px = Pearson r (px)

t-px = t-value argument for r (px)

p-px = probability r (px)

r-% = Pearson r (%)

t-% = t-value argument for r (%)

p-% = probability r (%)

df = degree of freedom. Equal for px and %.