Bad grammar is so maddening it activates the 'fight or flight' response within the human body, study finds

For many, bad grammar can be maddening. Now experts have discovered it really does cause a physical reaction – and even affects our heart rate. Instances of bad grammar can include mixing up tenses within a sentence, confusing the singular and plural, using a double negative or misusing a comma. Examples of the pet peeve include'We don't need no education', 'I ate porridge for breakfast and drink milk' or'Anna and Mike is going skiing'. Researchers from the University of Birmingham recruited 41 British English-speaking adults who listened to 40 English speech samples, half of which contained grammatical errors.