An experimental method called masked priming can be used to study both semantic and form priming. In masked priming, first we show symbols (e.g. for example ( @@@ ) for 500 milliseconds. Then we show the prime word for only 50 milliseconds (impossible to notice consciously), then we show the target word
كان في سؤال طويل على هذا الجزاء اللي فاكره يكتبه لنا
? Humans can produce/understand infinite number of sentences):
The Creativity of Human Language