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# Bourdon Test - Landolt Rings Online

The Bourdon test in the modification of "Landolt's Ring" is an attention test in which, in addition to the usual alphabetic symbols and numbers, ring elements with a certain direction of the gap are used. That is, the rings can have a cut on 8 sides - horizontally and vertically, as well as along the diagonals, among which it is necessary to highlight the rings that have a certain direction of the gap. The Landolt Ring test evaluates indicators such as speed, accuracy and productivity of attention, as well as mental performance and other indicators.

### Instructions for performing the Bourdon test - Landolt's rings:

The subject's task is to sequentially from left to right looking through the rows of rings to find and select among them those rings that have a certain direction of the gap. In the case of a simple version of Landolt rings, it is necessary to find rings with one direction of the gap, other options suggest searching for rings with two different directions of the gap. The time of working with the table of rings, as in the case of the alphabetic and numerical Bourdon test, is 5 minutes, after which you will be automatically redirected to the page with the test results. If you have selected all rings with a given direction of the gap, click the Submit button.

A simplified version of the Landolt Rings test

### Instructions for performing the Landolt Rings test - professional version:

In this variant of the Landolt Rings test, you will complete five blanks in sequence, one minute each for children and teens, and two minutes for adults. Every minute or two, depending on the version of the test, the test taker will begin filling out a new form until all five forms have been completed. The total duration of the test will be 5 minutes for the children's version and 10 minutes for the adult version, respectively. Upon completion of the test, the subject will go to the page of results compiled on the basis of the forms he filled out.

Conditionally professional Landolt Rings test

Correction test calculated indicators:

• Bourdon test calculated indicators:

Time spent t

The total number of characters viewed up to the last selected character N

Total number of lines viewed C

The total number of characters to be crossed out n

The total number of characters crossed out M

Correctly selected letters S

Letter characters you missedP

Wrongly selected characters O

• Calculation of the result:

Indicator of the speed of attention (attention performance) A=N/t A characters per second.

Work accuracy indicator (first option) T1=M/n T1 conventional units

Work accuracy indicator (second option) T2=S/n T2 conventional units

Work accuracy indicator (third option, according to Whipp) T3=(M-O)/(M+P) T3 conventional units

Mental productivity index E=N*T2 E characters.

Mental performance Au=(N/t)*((M-(O+P))/n) Au characters per second

Concentration (percentage of correctly highlighted characters from all that needed to be highlighted) K=((M-O)*100)/n K percent.

Indicator of stability of attention concentration Ku=C*(C/(P+O+(1))) (if there are no errors or omissions, add one to the divisor) Ku conventional units

The capacity of visual information (V) calculated by the formula: V=0,5936*N where 0,5936 - average capacity per character (bit) V characters

The processing rate (Q) is calculated by the formula: Q=(V-2,807*(P+O))/t where 2,807 - loss of information for one missed one, Q characters

Attention level K.

 The level of development of concentration of attention Value, K% Very good 81 - 100% Good 61 - 80% Average 41 - 60% Bad 21 - 40% Very bad 0 - 20%

Stability of concentration of attention - points and level.

 Ku Points Level 5,3 - 20,4 1 I Low 20,5 - 35,5 2 35,6 - 50,6 3 50,7 - 65,7 4 II Average 65,8 - 80,9 5 81,0 - 96,0 6 96,1 - 111,1 7 III Hight 111,2 - 126,2 8 126,3 - 171,9 9 172,0 - 219,7 10 IV Very hight 219,8 - 326,4 11 326,5 - 1101,5 12

Processing speed table for children from 7 to 14 years old.

 Age (years) V, bit Q, bit 7 - 8 260 0,74 9 - 10 282 0,83 11 - 12 340 1,02 13 - 14 375 1,11

Table of processing speed in points.

 Points Q, bit/с 1 <0,57 2 0,57 - 0,63 3 0,64 - 0,73 4 0,74 - 0,83 5 0,84 - 0,91 6 0,92 - 1,04 7 1,05 - 1,19 8 1,20 - 1,34 9 1,35 - 1,36 10 >1,36

Norm for adults Q = 1,6 (+-) 0,16.