The Cocktail Party Effect


The term cocktail party effect was coined by a British Cognitive scientist Colin Cherry, in the 1950s. He was interested in understanding how people listened, by conducting a few experiments. In his first experiment, he played two different overlapped messages recorded in the voice of the same person, through headphones. The participants were asked to listen carefully and try to write one of the messages on paper. If they put in enough concentration, the participants usually succeeded.

Now, if someone asks you to describe the cocktail party effect. The formal Cocktail Party effect definition is as follows:

Cocktail Party Effect Definition:

The cocktail party effect is the phenomenon of being able to focus one’s auditory attention on a particular stimulus while filtering out a range of other stimuli, much the same way that a partygoer can focus on a single conversation in a noisy room. Continue reading The Cocktail Party Effect

The Smell of Freshly Cut Grass

By Anupum Pant

Freshly cut grass certainly smells nice, doesn’t it? So does the smell of rain and the musky odor of books. There’s a reason why the freshly cut grass smell feels so good to humans, but first let’s see why does it even exist.

Some incorrectly believe that the freshly cut grass smell is a distress signal for other nearby plants to communicate to them that there’s something, either a plant eating insect or animal, coming towards them and that they need to move their nutrients to the root as soon as possible. That’s not quite right, or that is what science believes. Although there might be some truth to it because these things haven’t been extensively studied due their complexity. Researchers however have a strong feeling that this smell might not even be detectable by other plants.

But that smell, as studies have shown, definitely sends down signals that other insects can react to. This smell that comes from the fatty volatile substances released by plants is in fact really is a distress signal, however not for other plants to detect directly, it serves two purposes.

  1. It is a plant’s way of repelling the insect that’s eating it by making itself smell less appetizing to the insect.
  2. It’s  also a way for plants to call the parasitic insects to protect them from these plant eating creatures. Parasitic insects like wasps are expected to come and lay eggs inside herbivorous insects like caterpillars. And that ultimately saves the other plants from being eaten.

Another study conducted by Department of Physiology, Osaka City University Graduate School of Medicine says that this odor, composed of a mixture of  trans-2-hexenal and cis-3-hexen-1-ol, both of which can be bought from a chemical supplier, is called green odor and has a psychological effect among apes.

It can in fact heal the psychological damages caused due to stress. The mixture of these two chemicals causes local blood flow in the part of your brain that processes information for you to be able to smell it, obviously. But it also does the same in some other parts which isn’t usually effected by other common smells. That, they think indicates that the smell of freshly cut grass does in fact explains the healing effect. So, it’s good for apes and they like the smell.

It also reduces stress among rats and decreases the sensation of pain to some extent among humans. The smell also does help us tap into deep touching memories too, often referred to as the Proust Effect.

[Audio for more]

Catching Russian Spies With Science

By Anupum Pant

Consider this. You have the following line and you are asked to read out loud the colour of the word. It’s a rather easy exercise.


However, if the letters read of one colour and appear in some other colour, like the word “blue” appears in red colour, as shown below, it takes a slightly greater amount of time to process it inside and churn our the colour.


It can also be said with firm belief that you’ll take that extra time in the second exercise as compared to the first one only if you speak English. If you are a Russian, for instance, your brain would just skip the English letters and focus on the colour of the words. So, Russians would complete the second exercise in more or less the same time as the first one. This is the Stroop effect.

Thanks to the Stroop effect, it was literally a words play to catch a Russian spy.

Also, depressed people can be spotted using a similar exercise (again stroop effect).

Depressed participants will be slower to say the color of depressing words rather than non-depressing words. Non-clinical subjects have also been shown to name the color of an emotional word (e.g., ‘war’, ‘cancer’, ‘kill’) slower than naming the color of a neutral word (e.g., ‘clock’, ‘lift’, ‘windy’).