Featured Research

from universities, journals, and other organizations

What You See Is Not Always What You Do

Date:
October 30, 2009
Source:
NWO (Netherlands Organization for Scientific Research)
Summary:
Imagine: during lunch your colleague throws an apple to you. You catch it (of course) without difficulty. But what actually happened? Did you consciously decide to catch the apple with two hands? And how did your hands know where they had to be to catch the apple? According to a Dutch researcher, you can catch an apple like this thanks to the close cooperation between two separate visual systems. He has now established for the first time how these areas cooperate.

Imagine: during lunch your colleague throws an apple to you. You catch it (of course) without difficulty. No problem. But what actually happened? Did you consciously decide to catch the apple with two hands? And how did your hands know where they had to be to catch the apple? According to Dutch researcher Hemke van Doorn you can catch an apple like this thanks to the close cooperation between two separate visual systems. He has now established for the first time how these areas cooperate.

Van Doorn allowed a large number of study subjects to carry out different tests. He wanted to know if we do indeed work with two systems: one system that ensures conscious observation and one visual system that takes care of the movement. In order to demonstrate that the two visual areas are clearly separated, Van Doorn showed the study subjects rods with arrows at the ends. These arrows 'trick' our observation by making the rods seem longer or shorter.

When the study subjects had to say how long the rod was, they were tricked by the arrows. They estimated the length incorrectly. However, as soon as the study subjects were asked to pick up the rod, the size of their hand opening was found to be accurately adjusted to the actual length of the rod. The system for conscious observation and the visual system that guides movement are therefore clearly separated from each other. After all, one system made an error and the other did not.

How do you catch an apple?

Besides demonstrating that the two systems are separated, Van Doorn also revealed how the two systems cooperate. A lot of thinking and doing goes into catching an apple: an apple is flying towards me, that's a big apple, it's coming from the left, it's flying quite high, I must turn to catch it and I need two raised hands for that, I now catch the apple with two hands before it flies into my face. Up until now, however, it was not known which of the two systems was responsible for each aspect of catching the apple and other actions and responses. Van Doorn discovered that the system of conscious observation effectively does everything except for initiating the movement.

Furthermore, other tests revealed that determining the direction of a movement -- 'I must turn to catch the apple' and selecting the movement -- 'I need two hands' -- are the tasks of the visual system that consciously observes information, and not of the system that guides the movement. The two systems use other information as well. By measuring the gaze direction of the study subjects, Van Doorn could establish that the eyes are focused at different points for different tasks. With his research he demonstrated how our brains guide movement and the influence of our observations on this. Hemke van Doorn carried out his research within the Open Competition of the NWO Division for the Social Sciences. With the Open Competition, NWO seeks to stimulate innovative and high-quality scientific research.


Story Source:

The above story is based on materials provided by NWO (Netherlands Organization for Scientific Research). Note: Materials may be edited for content and length.


Cite This Page:

NWO (Netherlands Organization for Scientific Research). "What You See Is Not Always What You Do." ScienceDaily. ScienceDaily, 30 October 2009. <www.sciencedaily.com/releases/2009/10/091026105746.htm>.
NWO (Netherlands Organization for Scientific Research). (2009, October 30). What You See Is Not Always What You Do. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2009/10/091026105746.htm
NWO (Netherlands Organization for Scientific Research). "What You See Is Not Always What You Do." ScienceDaily. www.sciencedaily.com/releases/2009/10/091026105746.htm (accessed July 25, 2014).

Share This




More Mind & Brain News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Painkiller Designed To Discourage Abuse: Will It Work?

New Painkiller Designed To Discourage Abuse: Will It Work?

Newsy (July 24, 2014) The FDA approved Targiniq ER on Wednesday, a painkiller designed to keep users from abusing it. Like any new medication, however, it has doubters. Video provided by Newsy
Powered by NewsLook.com
Can Watching TV Make You Feel Like A Failure?

Can Watching TV Make You Feel Like A Failure?

Newsy (July 24, 2014) A study by German researchers claims watching TV while you're stressed out can make you feel guilty and like a failure. Video provided by Newsy
Powered by NewsLook.com
China's Ageing Millions Look Forward to Bleak Future

China's Ageing Millions Look Forward to Bleak Future

AFP (July 24, 2014) China's elderly population is expanding so quickly that children struggle to look after them, pushing them to do something unexpected in Chinese society- move their parents into a nursing home. Duration: 02:07 Video provided by AFP
Powered by NewsLook.com
Idaho Boy Helps Brother With Disabilities Complete Triathlon

Idaho Boy Helps Brother With Disabilities Complete Triathlon

Newsy (July 23, 2014) An 8-year-old boy helped his younger brother, who has a rare genetic condition that's confined him to a wheelchair, finish a triathlon. 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:
from the past week

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