Answer:
Taste
Explanation:
An absolute threshold is the lowest level of stimulus an organism is able to detect, 50 percent (half) of the time. Absolute threshold is majorly used in experimental research to detect stimulus that can be detected by the human five senses which are; taste, sound, sight, smell and touch.
In the case of Matthew, the absolute threshold is taste as he was able to immediately detect the presence of artificial sweeteners in his drink.