Rules: A character with Exceptional Sense receives a bonus of 1 for checks with Perception, but only if the check uses the named sense. You can choose from the following senses: Sight, Hearing, Smell & Taste, Tactile Sense. You can purchase Exceptional Sense more than once (for different senses), but only once per sense.
Prerequisites: No disadvantage Restricted Sense for the same sense, no disadvantage Blind (for Sight), no disadvantage Deaf (for Hearing).
AP Value: Sight: 12 adventure points; Hearing: 12 adventure points; Smell & Taste: 6 adventure points;
Tactile Sense: 2 adventure points
Publication: Core Rules page 165