How The Brain Processes Visual Information Provides Insight Into Neural Mechanisms Of Attention
Ever wonder how the human brain, which is constantly bombarded with millions of pieces of visual information, can filter out what's unimportant and focus on what's most useful?  The process is known as selective attention and scientists have long debated how it works. But now, researchers at Wake Forest Baptist Medical Center have discovered an important clue. Evidence from an animal study, published in the online edition of the journal Nature Neuroscience, shows that the prefrontal cortex is involved in a previously unknown way. 
Why some types of multitasking are more dangerous than others
In a new study with implications for distracted drivers, researchers found that people are better at juggling some types of multitasking than they are at others. Trying to do two visual tasks at once hurt performance in both tasks significantly more than combining a visual and an audio task, the research found. Alarmingly, though, people who tried to do two visual tasks at the same time rated their performance as better than did those who combined a visual and an audio task — even though their actual performance was worse.

Expectations Lead to Less but More Efficient Processing in the Human Brain
Even though we have the impression that we see the world around us as it really is, our perception is strongly influenced by our expectations. Our knowledge of the world helps us recognise objects and people quickly and accurately, even when the image we receive is noisy or unclear, such as cyclists in the park at dusk, or football players on a television set with poor reception.

El truco del cerebro que nos permite oír selectivamente
Ahora científicos en Estados Unidos lograron entender cuáles son los mecanismos que subyacen a este "oído selectivo", cuando oímos sólo lo que queremos escuchar e ignoramos lo que no nos conviene oír.
Descubrieron que el cerebro puede utilizar filtros que permiten seleccionar sonidos en ambientes ruidosos, como la conversación de una sola persona en una fiesta o una multitud, e ignorar el resto.