Maths and human behavior graph and formulas

Can maths and psychology be connected somehow? I mean can we describe emotions and behavior by some variable or some formula that gives us same results in same situations from different persons?

I attended a seminar in which sir said that this graph can be seen as with three points we can think of it as three people and $+$ sign will say they are connected (friend or other) and $-$ sign will say disconnected (enemy or something like that or don't know each other).

Now suppose one point is girl $g$ and other two points are boys $b_1, b_2$. Then if $g$ and $b_1$ likes each other, it's a $+$. Also, the $b_2$ likes $g$ but $g$ does not like $b_2$, it's a $-$.

So the sign between $b_1$ & $b_2$ will become automatically $-$ from $+$ (if those two boys were friends).

But it's just an example what he explained if there are any other examples anyone know that connects human behavior and thoughts with mathematics please share.

It is much better if somebody tell me if it is possible to go with both the subjects in future, that will be great.

• Certainly, probability and statistics can be (and are) used to describe human behaviour. Almost any psychology experiment will use statistical methods. But "same results in same situations from different persons"? People are generally not predictable enough for that: you won't even always get the same results in the same situations from the same person. Jul 24, 2017 at 5:27
• So there is no way to predict behavior ? Not even how much percentage... If someone tell you their past experiences Jul 24, 2017 at 6:46
• Mathematics can be used to describe human behaviour, just as it can be used to describe other things in real life. However, whether human behaviour can be predicted mathematically is a question for psychology, not mathematics.
– user856
Jul 24, 2017 at 9:07
• Actually I think it is a mathematical question..I read somewhere that everything in real world can be describe mathematically ...I don't know where I read that. This ques is combination of my previous memories and curiosity. It is said by Ramanujan (an equation has no meaning for me unless it expresses a thought of GOD). +some person (currently alive) with IQ 92. Jul 24, 2017 at 9:35
• @Rahul: this is a co-disciplinary matter. A psychologist is not prepared to build and validate mathematical models.
– user65203
Jul 24, 2017 at 9:41

This requires to objectivate these aspects and measure then in a repeatable way. For instance, how can we rate "being in a good mood" ? An approach could be to count the number of smiles during an hour (assuming we can objectivate smiles sufficiently accurately ;-) ). (Now what is "$a$ likes $b$" ?)