Navigation Links
When errors improve performance: Model describes how experiences influence our perception
Date:11/28/2011

During estimation processes we unconsciously make use of recent experiences. Scientists from Ludwig-Maximilians-Universitt (LMU) in Munich and the Bernstein Center Munich asked test subjects to estimate distances in a virtual reality environment. The results revealed that estimates tended to approach the mean of all previously experienced distances. For the first time, scientists were able to accurately predict the experimental findings using a mathematical model. The model combines two well-known laws of psychophysics with a theorem from probability theory. The study could be of fundamental relevance to research on perception.

Why do we perceive identical distances as long in one situation and short in another? It all depends on the distances that we have covered in the immediate past. This might seem a trivial conclusion, but it gives an important insight into how the brain processes signals of different intensities or even abstract elements such as numbers. Dr. Stefan Glasauer (LMU Munich), project leader at the Bernstein Center Munich, and PhD student Frederike Petzschner have investigated this effect both experimentally and theoretically. Test subjects were first asked to perform certain displacements in virtual reality and then to reproduce these displacements as accurately as possible. As in previous studies, the results showed a bias towards the mean of all previously experienced displacements.

The scientists can now provide a general explanation for this phenomenon. With the help of a mathematical model, they can calculate how previous stimuli affect the current estimate. "The influence of prior experience most probably follows a general principle, and is likely to hold true for the estimation of quantities or sound levels also," says Glasauer. Test subjects whose distance estimates were strongly influenced by prior experience also placed greater weight on prior experience when asked to assess angular displacements. In both cases, they were learning without having received any information about the success or failure of their previous performance. Conventional learning methods, however, presuppose such feedback mechanisms.

Whether or not a fundamental principle determines the perception of stimulus strengths, such as sound levels, brightness, or even distances, has been a controversial issue. Two important laws of psychophysics, the so-called Weber-Fechner law, published 150 years ago, and the 50-year-old Stevens' power law, seemed to contradict each other. The Munich scientists have now shown that the two laws are in fact compatible, at least for certain cases. By combining the Weber-Fechner law with Bayes' Theorem (1763), a procedure from probability theory that allows evidence to be weighted, they were able to transform it into Stevens' power law. Glasauer is therefore confident that "we have contributed to solving a problem that perception researchers have been studying for more than 50 years now." Next, the researchers want to analyze historical data and determine whether the model also applies to different stimulus modalities, such as sound levels and brightness.


'/>"/>

Contact: Luise Dirscherl
dirscherl@lmu.de
49-892-180-2706
Ludwig-Maximilians-Universitt Mnchen
Source:Eurekalert

Related medicine news :

1. Teen Drivers Prone to G-Force Errors, Researchers Say
2. Cognition research aims to reduce medical errors
3. Temporary ER Staff Linked to More Medication Errors
4. Combination of existing safety checks could greatly reduce radiotherapy errors
5. Fewer Surgical Errors Reported at VA Medical Facilities
6. E-Prescribing Doesnt Slash Errors, Study Finds
7. Experts seek reforms to prevent errors from medical resident fatigue, lack of supervision
8. Study Finds Equal Number of Errors in Hospitals, Doctors Offices
9. Errors put infants, children at risk for overdose of painkillers
10. Driver Errors Explain Most Teen Crashes, Experts Say
11. Report: Hospital Errors May Be Far More Common Than Suspected
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... Yisrayl Hawkins, ... week that explains one of the most popular and least understood books in the ... cryptic and puzzling descriptions that have baffled scholars for centuries. Many have tossed it ...
(Date:10/13/2017)... VA (PRWEB) , ... October 13, 2017 , ... ... of DevOps and Agile Software Development, has been awarded a contract by the ... Blanket Purchase Agreement (BPA) aims to accelerate the enterprise use of Agile methodologies ...
(Date:10/13/2017)... ... ... On The Brink”: the Christian history of the United States and the loss of ... William Nowers. Captain Nowers and his wife, Millie, have six children, ten grandchildren, ... Navy. Following his career as a naval aviator and carrier pilot, he spent ...
(Date:10/12/2017)... ... 12, 2017 , ... CitiDent and San Francisco dentists, Dr. ... Oventus O2Vent technology. As many as 18 million Americans are estimated to suffer ... Oral appliances can offer significant relief to about 75 percent of people with ...
(Date:10/12/2017)... ... October 12, 2017 , ... The ... demand of today’s consumer and regulatory authorities worldwide. From Children’s to Adults 50+, ... to meet the highest standard. , These products are also: Gluten Free, ...
Breaking Medicine News(10 mins):
(Date:9/28/2017)... Sept. 28, 2017 Hill-Rom Holdings, Inc. (NYSE: ... conference call and webcast on Friday, November 3, 2017, ... and ending at approximately 8:30 a.m. (CDT) / 9:30 ... company,s 2017 financial performance and guidance for 2018, Hill-Rom ... to enhance operational performance, and long-range financial outlook through ...
(Date:9/25/2017)... , Sept. 25, 2017  EpiVax, Inc., ... vaccine design, and immune-engineering today announced the launch ... the development of personalized therapeutic cancer vaccines. EpiVax ... provided exclusive access to enabling technologies to the ... MBA will lead EpiVax Oncology as Chief Executive ...
(Date:9/19/2017)... 19, 2017   ZirMed Inc ., a recognized leader ... that it has been ranked #1 by its users for ... Rankings 2017 User Survey. ZirMed was recognized as the top-ranked ... and medical centers over 200 beds and holds one of ... user survey history. ...
Breaking Medicine Technology: