why dose my forehead tingle when something like a pencil points at it?
The tingling sensation you feel on your forehead when something like a pencil points at it could be attributed to a phenomenon known as the "ideomotor effect." The ideomotor effect is a psychological phenomenon where subtle muscular movements occur in response to thoughts or expectations. When you see a pencil or any pointed object approaching your forehead, your brain may subconsciously predict the sensation of contact or pressure, hence triggering the tingling sensation.
However, it's important to note that the exact cause of this individual experience can vary between individuals. It may also be influenced by factors such as sensitivity, perception, and personal psychological associations. If this sensation persists or causes any discomfort, it's always advisable to consult a medical professional for a proper evaluation.