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.
It is popular to keep betta fish in very small containers for display around the home. Contrary to popular belief this can stress the fish causing health issues. Bettas prefer to be kept in larger tanks or community tanks. The smallest tank recommended is 20 litres,or 5 gallons, and bigger is advisable.