Bourdon test variant with letters online

The Bourdon test in the letter version is quite common among psychologists. It is easy to complete. And it allows you to give a relatively objective assessment of the possibilities of human attention. The test is a table of 40 by 40 cells with the letters of the English alphabet, a total of 1600 letters in the table. Among all the letters, the subjects need to sequentially find and select the given letters. Usually it is necessary to select those letters that are the first in the row.

Instructions for performing the Bourdon test - letter version:

Your task is to sequentially look through each line of the test to highlight those letters in it that are located first in these lines (in this case, these letters are already highlighted in a different color). In a simplified version, your work with a proof test is not interrupted and lasts 5 minutes. In the advanced version, which allows you to evaluate more parameters of your attention, your work is automatically interrupted every minute, the page is refreshed, the data is saved, and you continue to work from the same place where you left off.

The usual version of the letter proof test is:
Random distribution of letters
Continuous test passing
Take the test "Bourdon test letter variant" online - simplified version

Advanced version of the Bourdon test letter variant:
More even distribution of alphabetic characters
The page is refreshed every minute
More attention indicators - added fatigue index
Take the test "Bourdon test - letter variant" online - advanced

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

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

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