![\"cocktail](\"https:\/\/www.nuheara.com\/usa\/wp-content\/uploads\/2021\/08\/cocktail-party-effect.jpg\")
<\/p>\n<\/p>\n
The term cocktail party effect has been around for several decades. However, only during the last several years have researchers gained an in-depth understanding of the phenomenon. Also known as selective hearing, the cocktail party effect refers to the ability of humans to focus all their attention on one speaker while tuning out competing and distracting noises in the background<\/a>.<\/p>\n Human wiring appears to make focusing attention on the person they want to hear almost an automatic process. This is true regardless of the environment, whether it is\u00a0a noisy bar<\/a>, sporting event, work, school, or a literal cocktail party.<\/p>\n Thanks to rapidly advancing technology, researchers better understand how the phenomenon of selective hearing works in the brain. As a result, they have greater knowledge of brain functions and the causes of the cocktail party effect phenomenon.<\/p>\n Nine years ago, two researchers at the University of California at San Francisco\u00a0worked with three patients who had severe epilepsy<\/a>. They sought to uncover the cause of electrical signal mix-ups in the brain causing severe seizures. These episodes were important to dissect because of their negative impact on quality of life.<\/p>\n Dr. Edward Chang, a UCSF faculty member at the Keck Center for Integrative Neuroscience and Department of Neurological Surgery, led the study. Post-doctoral fellow Nima Mesgarani worked with Dr. Chang throughout this research study.<\/p>\n Prior to working with Dr. Change and Nima Mesgarani, PhD, the three people with epilepsy underwent brain mapping over a seven-day period with the Epilepsy Team from UCSF. The team obtained the brain mapping report by attaching up to 256 tiny electrodes under each patient\u2019s skull on the outer surface or cortex of their brain. The electrodes recorded activity from the auditory cortex in the temporal lobe.<\/p>\n Back in 2012, Dr. Chang commented that the availability of brain recordings with high resolution and algorithms containing powerful decoding capabilities created new and exciting research possibilities with the human brain. Technology has only advanced since that time, which means\u00a0manufacturers of sound amplification and voice-activated devices will develop increasingly effective conversation boosting<\/a> technology.<\/p>\n Dr. Chang and post-doctoral fellow Nima Mesgarani played two speech samples for each of the patients and asked them to pay special attention to specific phrases. The researchers then asked the patients to repeat the key phrases spoken by just one of the speakers.<\/p>\n Using newly identified brain decoding methods, Chang and Mesgarani reconstructed what the three patients heard just by analyzing activity patterns in their brains. They were surprised to learn that the neural responses in the auditory cortex of all three patients detected only the key phrases from the selected speaker.<\/p>\n Cocktail-Party Effect: The ability to attend to one of several speech streams while ignoring others, as when one is at a cocktail party. Researchers first thought unattended messages aren\u2019t processed, but later findings indicated that meaning is identified in at least some cases. pic.twitter.com\/Dury6xdZpM<\/a><\/p>\n — AP Psychology Review (@Psych_Review) November 2, 2020<\/a><\/p><\/blockquote>\nThe 2012 UCSF Study on the Cocktail Party Effect<\/strong><\/h2>\n
![\"\"](\"https:\/\/www.nuheara.com\/wp-content\/uploads\/2021\/08\/clinical-study.jpg\")
<\/p>\nHow the Brains of Research Subjects Responded to Speech<\/strong><\/h2>\n
\n