When can we trust our senses to give us truth?

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Since humans evolved, we’ve relied on our senses to guide us and help us survive, for without them, we’d have gone extinct a long time ago. Our sight lets us view the world around, allowing us not only to spot danger, but also to explore, and discover new places and objects, whilst our hearing allows us, for example, to survey our surrounding more efficiently. We’ve always needed our senses to survive, so much so that the idea of them being untrustworthy is a worrying thought, but is it possible for this to happen, and can our senses be deceived?

The first issue is what actually is truth? There are many things that we perceive to be true, depending on perspective or our beliefs, which differ from one person to the next, known as subjective truth. For example, when facing another person, with two objects in the middle, like in the diagram shown, for person A, the truth is that the red object is on the left, but for person B this is false, as it’s on the right from their point of view. On the other hand, there truths which are true no matter your perspective. For example, if person A instead said that the red object was west of the blue box, this would be true no matter where someone was viewing them from. Another example of this is 1+1=2 (written in base 10), as this will always be true, no matter your perspective, or learning.

Another issue to determine is the type of truth that’s being looked at. It’s not physically possible for our senses to give us all the truth about something our senses tell us. For example when looking at a painting, a watercolour of a field perhaps, we can see the colours and shapes of the landscape, but how much truth can we really discover from the painting? We can see the way the artist interpre...

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...rly. In the case of a colour-blind person, it’s not possible for them to completely trust their senses to give them truth, although only 1 in 12 people need to worry about this.

Finally, it appears that our senses are a limiting factor when searching for truth, whether it’s a physical limitation, for example a defect in the cones of person’s eyes, a limitation caused by drugs affecting the brain, or the image itself limiting the truth our senses can perceive from it. Overall however, it seems it would be more accurate to say that we can trust our senses completely; it’s our cognitive processing that can deceive our perception of the truth. The way we interpret the information our senses receive can be affected by a number of different things, whether it’s our genetic make-up, our culture, or our experiences, all can change the way the brain deciphers the stimuli.

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