Answer :
Final answer:
A subharmonic photic driving response occurs when the brainwave frequencies align at a fraction of the rate of a periodic light stimulus, specifically at half the frequency of the flash strobe.
Explanation:
A subharmonic photic driving response is defined as a brainwave response to periodic light stimulation at a frequency that is a submultiple of the frequency of the stimulus. In the context of your options, the correct answer would be (b) half the frequency of the flash strobe. This phenomenon occurs when brainwave frequencies align at a rate that is a fraction of the driving periodic stimulus, like repeating at half the rate of the stimulus flash. It is a type of stroboscopic effect and has implications in fields such as neuroscience and electroencephalography (EEG).
