system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we squint our eyes when we try to listen/hear something that is difficult to hear?
gpt
I believe it is related to us subconsciously trying to increase our ability to focus on the incoming signal of the sound by blocking out some of the other sensing signal noise e.g. Vision. So by squinting, we reduce the visual signals to our brain and it is better able to focus on the audio input aspects. Much like how you hear some blind people developing almost supernatural  other senses, but on a much smaller and immediate scale.