Reading on a Smartphone or a Book Which is better?

A research finding published in the prestigious Nature magazine (Jan 2022)

says that compared to reading on a paper medium, reading on a Smartphone produces fewer sighs, promotes brain over activity in the prefrontal cortex (thinking brain), and results in reduced understanding.?

We have two types of breathing normal breathing and sighing (_lambee saans_)

On an average, humans produce about?12 spontaneous sighs in 1 hour. That means you sigh unconsciously once every 5 minutes.

When we are breathing normally, the small air sacs in our lungs, called?alveoli, can sometimes collapse spontaneously. This can reduce the oxygen intake. A sigh reinflates our alveoli.

When are reading on a smart phone instead of one sigh every 5 minutes it can become one sigh every 7-10 minute. The oxygen level in our body decreases, our thinking brain get over loaded and we are not able to understand what we read.

One of the possible causes of why sighing decreases when we use smart phones is the blue light emitted by smart phones

So when reading using smart phones or any electronic device like iPad or laptop

?Reduce the blue light

Take a deep breathe every 5 minutes.

For long reading prefer print outs or books.?