If the measurement from Fp2 to O2 is 24cm, how far should F4 be marked if the zero remains at Fp2?

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To determine the appropriate positioning of F4 in relation to Fp2 based on the given measurement from Fp2 to O2, it's crucial to understand the standard 10-20 EEG electrode placement system. In this system, the measured distance from Fp2 to O2 is indeed 24cm.

F4 is positioned at a 60% distance from Fp2 towards O2. To find this distance mathematically, you would calculate 60% of the distance from Fp2 to O2:

  1. Calculate 60% of 24 cm:

( 24 , \text{cm} \times 0.60 = 14.4 , \text{cm} )

  1. Since the zero reference point is at Fp2, you would measure 14.4 cm out towards O2 to identify F4. Therefore, F4 is positioned at a distance of 14.4 cm from Fp2 directly toward O2.

However, the original question only provides discrete options for distance, and since these options do not directly reflect the exact calculated distance, assumptions about rounded values or typical placements according to common practice within the EEG community would apply.

In this context, 6

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