Featured Research

from universities, journals, and other organizations

Sound Adds Speed To Visual Perception

Date:
August 12, 2008
Source:
BMC Neuroscience
Summary:
The traditional view of individual brain areas involved in perception of different sensory stimuli -- i.e., one brain region involved in hearing and another involved in seeing -- has been thrown into doubt in recent years. A new study shows that, in monkeys, the region involved in hearing can directly improve perception in the visual region, without the involvement of other structures to integrate the senses.

The traditional view of individual brain areas involved in perception of different sensory stimuli—i.e., one brain region involved in hearing and another involved in seeing—has been thrown into doubt in recent years.

Related Articles


A new study shows that, in monkeys, the region involved in hearing can directly improve perception in the visual region, without the involvement of other structures to integrate the senses.

Integration of sensory stimuli has traditionally been thought of as hierarchical, involving brain areas that receive signals from distinct areas of the brain layer known as the cortex that recognise different stimuli. But the recent finding of nerve cells projecting from the auditory cortex (associated with the perception of sound) directly into the visual cortex (associated with sight), suggest that perception of one sense might affect that of another without the involvement of higher brain areas.

"Auditory or visual–auditory responses in the primary visual cortex are highly probable given the presence of direct projections from the primary auditory cortex", explain P. Barone and colleagues from the Centre for Brain and Cognition Research, Toulouse, France. "We looked for modulation of the neuronal visual responses in the primary visual cortex by auditory stimuli in an awake monkey."

The researchers recorded the neuronal responses with microelectrodes inserted directly into the primary visual cortex of a rhesus macaque. The monkey was then required to orient its gaze towards a visual stimulus. The time taken for the neurons in the visual cortex to respond to the stimulus, or latency, was recorded. Barone and colleagues then measured the latency when the visual stimulus was accompanied by a sound emanating from the same spot. When the visual signal was strong—i.e., high contrast—the auditory stimulus did not affect latency; however, if the visual signal was weaker—i.e., low contrast—latency decreased by 5-10%, suggesting that in some way the auditory stimulus speeds up the response to the visual stimulus.

"Our findings show that single neurons from one primary sensory cortex can integrate information from another sensory modality", the researchers claim. They propose that the auditory cue is processed more quickly than the visual stimulus, and because the monkeys have learned to associate that sound and sight, the visual cortex is primed to perceive the weaker signal. "Our results argue against a strict hierarchical model of sensory integration in the brain and that integration of multiple senses should be added to the list of functions of the primary visual cortex."


Story Source:

The above story is based on materials provided by BMC Neuroscience. Note: Materials may be edited for content and length.


Cite This Page:

BMC Neuroscience. "Sound Adds Speed To Visual Perception." ScienceDaily. ScienceDaily, 12 August 2008. <www.sciencedaily.com/releases/2008/08/080811200557.htm>.
BMC Neuroscience. (2008, August 12). Sound Adds Speed To Visual Perception. ScienceDaily. Retrieved March 28, 2015 from www.sciencedaily.com/releases/2008/08/080811200557.htm
BMC Neuroscience. "Sound Adds Speed To Visual Perception." ScienceDaily. www.sciencedaily.com/releases/2008/08/080811200557.htm (accessed March 28, 2015).

Share This


More From ScienceDaily



More Mind & Brain News

Saturday, March 28, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

AAA: Distracted Driving a Serious Teen Problem

AAA: Distracted Driving a Serious Teen Problem

AP (Mar. 25, 2015) While distracted driving is not a new problem for teens, new research from the AAA Foundation for Traffic Safety says it&apos;s much more serious than previously thought. (March 25) Video provided by AP
Powered by NewsLook.com
Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Reuters - Innovations Video Online (Mar. 25, 2015) European researchers say our smartphone use offers scientists an ideal testing ground for human brain plasticity. Dr Ako Ghosh&apos;s team discovered that the brains and thumbs of smartphone users interact differently from those who use old-fashioned handsets. Jim Drury went to meet him. Video provided by Reuters
Powered by NewsLook.com
Many Don't Know They Have Alzheimer's, But Their Doctors Do

Many Don't Know They Have Alzheimer's, But Their Doctors Do

Newsy (Mar. 24, 2015) According to a new study by the Alzheimer&apos;s Association, more than half of those who have the degenerative brain disease aren&apos;t told by their doctors. Video provided by Newsy
Powered by NewsLook.com
A Quick 45-Minute Nap Can Improve Your Memory

A Quick 45-Minute Nap Can Improve Your Memory

Newsy (Mar. 23, 2015) Researchers found those who napped for 45 minutes to an hour before being tested on information recalled it five times better than those who didn&apos;t. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins