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.
Reality: Many pet stores will tell customers that cold cups are not problematic because bettas are not tropical fish. I'm sure the people of Thailand would be interested to learn that they are living in a temperate climate! Bettas, like many other tropical fish, have an ideal temperature range of 76-82 degrees. They survive perfectly well in temperatures upwards of 86 degrees, but they can not thrive in temperatures below 72.