Do your ears deceive you?

My experience is different I can hear differences on cables . I can also hear the difference on cart as well.

Of course your ears can deceive you. Your mind can play tricks on what you "want to hear" as opposed to what is really being played. This will largely depend on your age and hearing, but no question about your mind playing tricks on what you "want" to hear.

On a side note, I have not changed any of the power cords nor I have spent extra $$ for speaker cables or interconnect upgrades. In case you are wondering, here is what I have:

Speaker cables: Kimber 8TC Kimber Kable 8TC Speaker Cable Review

Interconnects: Wireworld Equinox III Wireworld Equinox III+ interconnect & speaker cable

 We don't typically listen under blind conditions.  If an improvement is perceived, and it is unshakable under normal listening conditions, then it works for you. We need not ask why - unless we're curious about it. When people start giving untested and unlikely explanations for why, that's when people rightfully start questioning, and that's when the ones making the claim needs to prove their explanation in a rigorous manner. 

asctim

... When people start giving untested and unlikely explanations for why, that's when people rightfully start questioning, and that's when the ones making the claim needs to prove their explanation in a rigorous manner. 

Nonsense. This isn't a scientific forum. No one here owes you any "rigorous" explanation or any other kind of proof, although of course you're free to conduct your own experiments and share the results. If the empirical evidence described by users here is insufficient for you, perhaps you are in the wrong place.

We don't typically listen under blind conditions.  If an improvement is perceived, and it is unshakable under normal listening conditions, then it works for you.

So you'd be ok owning expensive cables if you knew that if you were blindfolded you couldn't discern a difference between them and inexpensive cables? That would be ok because when you could see the cables (normal listening conditions) they sound better? I know the answer is that you wouldn't know that because you wouldn't test that. I figure that's the reason most cable lovers bend over backwards to justify not testing their sighted conclusions.