The Mind Needs Stimulation

A human totally deprived of bodily senses does not do well. After 12 hours in a sensory deprivation tank (where one floats in a body-temperature saline solution that produces almost no skin sensation, in total darkness and silence, with taste and smell and the sensations of breathing minimized) a subject will begin to hallucinate, as the mind, somewhat like a television tuned to a nonexistent channel, turns up the amplification, desperately looking for a signal, becoming ever less discriminat...

 Questioning Air Pollution

How should a living organism live? When spring arrives, you open your doors, the wind blows in. The smell of flowers fills the airand colors come back to lifeSometimes when it rains or when it’s foggy out. You can’t help but breathe the air deep into your lungs and experience the feeling of small water droplets filling them up. Both piercingly cold but also pure and fresh. In autumn, you would spend a whole afternoon with a loved one doing absolutely nothing, basking lazily in the sun....

 Multisensory Integration

In sensory perception, multisensory integration is the rule, not the exception. In audition, we don’t just hear with our ears, we use our eyes to locate the apparent sources of sounds in the cinema where we “hear” the voices coming from the actors’ mouths on the screen, although the sounds are coming from the sides of the theater. This is known as the ventriloquism effect. Similarly, retronasal odors detected by olfactory receptors in the nose are experienced as tastes in the mouth. T...

 Dolphins have Genes for Smelling

Another curious tale of dead genes involves our sense of smell, or rather our poor sense of smell, for humans are truly bad sniffers among land mammals. Nevertheless, we can still recognize over 10,000 different odors. How can we accomplish such a feat? Until recently, this was a completely mystery. The answer lies in our DNA—in our many olfactory receptor (OR) genes. [...] Our own sense of smell comes nowhere close to that of mice. One reason is that we express fewer OR genes—only abou...

 How the Mother-Infant Bond Grows Over Time

Evidence that there is some sort of heightened awareness by mothers, caused either by biology or emotions, is seen in a mother's ability soon after birth to recognize her infant by smell and voice alone. In several studies, mothers who had spent only a few hours with their newborns were able to smell out their babies when comparing their shirts with the shirts worn by other babies. Mothers are also pretty good at hearing their infants. Women with new infants in wards usually sleep through the...