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3.1.3. Working up of the results

3.1.3.1. Calculating the situational index of fah.

3.1.3.1.1. The absolute situational index of FAH is the difference between the activation of left and right hemispheres. It is calculated by way of subtracting the quantity of AH of a right hemisphere from the quantity of AH of a left hemisphere. If the result has “+” sign it is put down into column 6, if it has “-“ sign – into column 7, and if it is equal to zero – into columns 6 and 7 of table 7 simultaneously.

3.1.3.1.2. Then calculate the relative situational index of FAH according to the Following formula:

AHleft - AHright

FAH = ------------------------ x 100 % (3),

AHleft + AHright

Where FAH – functional asymmetry of hemispheres,

AHleft – activation of left hemisphere,

AHright – activation of right hemisphere.

Put down the results into column 9, table 7.

3.1.3.2. Individually typological index of FAH is calculated as an arithmetic mean of a number of FAH indexes in background situations according to the Following formula:

FAHb1+FAHb2+FAHb3+FAHb4

FAHt =-------------------------------------------- (4),

h

Where FAHt – individually typological index of FAH,

FAHb – the index of situational FAH in background conditions,

h – the number of results of investigations of background FAH.

3.1.3.3. Activity-stereotyped index of FAH is calculated as an arithmetic mean of a number of FAH indexes in the process of professional or other investigated activity.

When calculating individually typological and activity-stereotyped indexes of FAH the results with left-hemisphere displacement should be marked by “+” sign, while the results with right-hemisphere displacement should be marked by “-” sign. Then it is necessary to subtract the sum of right-hemisphere displacements from the sum of left-hemisphere displacements. If the result has “+” sign, you may speak about the left hemisphere displacement of final index of FAH and if it has “-” sign - about the right hemisphere displacement of final index of FAH.

For example, it is necessary to calculate an individually typological index of FAH according to the Following five measurements of background FAH:

  1. right-hemisphere displacement of FAH to 24 % (FAHb 1 = - 24),

  2. left-hemisphere displacement of FAH to 5 % (FAHb 2 = + 5),

  3. right-hemisphere displacement of FAH to 19 % (FAHb 3 = - 19),

  4. the absence of FAH displacement (FAHb 4 = 0),

  5. right-hemisphere displacement of FAH to 2 % (FAHb 5 = - 2).

Having put down the obtained figures of FAH into the formula (4) we get:

(-24) + (+5) + (-19) + 0 + (-2) (- 40)

FAHt = -------------------------------------- = ------------ = - 8 % (5),

5 5

Taking into account that the result has “ - ” sign it testifies to a right-hemisphere displacement of typological characteristics of FAH.

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