def calculate_stimulation_freq(flash_time: float) -> float:
    """Calculate Stimulation Frequency.

    In an RSVP paradigm, the inquiry itself will produce an
        SSVEP response to the stimulation. Here we calculate
        what that frequency should be based in the presentation
        time.

    PARAMETERS
    ----------
    :param: flash_time: time in seconds to present RSVP inquiry letters
    :returns: frequency: stimulation frequency of the inquiry
    """

    # We want to know how many stimuli will present in a second
    return 1 / flash_time