Java - incrementing a counter once when within a range

I have a program that grabs a file containing boolean values, and I'm counting the number of false values until it reaches a true value. Then, when it encounters another false value it counts them again. I have a lower threshold and a higher threshold for the number of false values, and I need to increment a counter only once when within this range. This is not a homework assignment, by the way.

**private static int readBooleanValues(File textFile, int higher, int lower) throws FileNotFoundException {
    Scanner scanner = new Scanner (textFile);
    int counter = 0;
    int secondaryCounter = 0;
    while ( scanner.hasNext() ) {
        String value = scanner.next();
        if ( value.equalsIgnoreCase("false") ) {
            counter++;
            if ( counter >= lower && counter <= higher ) {
                secondaryCounter++;
            }
        } else if ( value.equalsIgnoreCase("true") ) {
            counter = 0;
        }    
    }
    return secondaryCounter;
}**