Final answer:
The Eysencks' theory describes individuals who are affect intense as having high levels of emotional instability and reacting with extreme emotional intensity to all events. This can lead to an overly positive reaction to good events and an overly negative reaction to bad events.
Step-by-step explanation:
The Eysencks' theory of personality describes two factors: extroversion/introversion and emotional stability/instability. Individuals who are affect intense tend to have high levels of emotional instability, or neuroticism. They react with extreme emotional intensity to all events, regardless of their nature. This means that they may have an overly positive reaction to good events and an overly negative reaction to bad events.