The term cognition is often incorrectly used to mean cognitive abilities or cognitive skills..
The best water temperature for betta fish is around 74-78 Fahrenheit, or 23-25 Celsius. Your betta will generally be fine if the water temperature is slightly out of this range (72-80 F), but 74-78 is what their natural habitat of rice paddies in Thailand and other southeast asian countries contains.lightly warmer water temperature for Betta fish (80-82 F) can be used if your betta is sick and needs to be quarantined or separated from other fish while he is being treated with medication.
I have been keeping Bettas for years. Unfortunately, people are often misinformed about a bettas needs. First off unless you live in a tropical location, a tank heater is a must have. Betta fish come from Thailand where it is 80 degrees even in the winter. Will your fish survive without a heater?