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Highly flexible despite hard-wiring: Even slight stimuli change the information flow in the brain

Date:
March 23, 2012
Source:
Max-Planck-Gesellschaft
Summary:
When looking at an optical illusion that can appear as either one cup or two faces, which do you see first? What we believe we see in one of the most famous optical illusions changes in a split second; and so does the path that the information takes in the brain. Changes in the information processing can be triggered even by a slight stimulus, such as a scent or sound, at the right time.

Images or cup? Due to the rapid reorganization of networks in the brain we perceive different elements of the image.
Credit: Demian Battaglia/ MPI for Dynamics and Self-Organization

One cup or two faces? What we believe we see in one of the most famous optical illusions changes in a split second; and so does the path that the information takes in the brain. In a new theoretical study, scientists of the Max Planck Institute for Dynamics and Self-Organization, the Bernstein Center Göttingen and the German Primate Center now show how this is possible without changing the cellular links of the network. The direction of information flow changes, depending on the time pattern of communication between brain areas. This reorganisation can be triggered even by a slight stimulus, such as a scent or sound, at the right time.

The way that the different regions of the brain are connected with each other plays a significant role for information processing. This processing can be changed by the assembling and disassembling of nerve fibres joining distant brain circuits. But such events are much too slow to explain rapid changes in perception. From experimental studies it was known that the responsible actions must be at least two orders of magnitude faster. The Göttingen scientists now show for the first time that it is possible to change the information flow in a tightly interconnected network in a simple manner.

Many areas of the brain display a rhythmic nerve cell activity. "The interacting brain areas are like metronomes that tick at the same speed and in a distinct temporal pattern," says the physicist and principal investigator Demian Battaglia. The researchers were now able to demonstrate that this temporal pattern determines the information flow. "If one of the metronomes is affected, e.g. through an external stimulus, then it changes beat, ticking in an altered temporal pattern compared to the others. The other areas adapt to this new situation through self-organisation and start playing a different drum beat as well. It is therefore sufficient to impact one of the areas in the network to completely reorganize its functioning, as we have shown in our model," explains Battaglia.

The applied perturbation does not have to be particularly strong. "It is more important that the 'kick' occurs at exactly the right time of the rhythm," says Battaglia. This might play a significant role for perception processes: "When viewing a picture, we are trained to recognize faces as quickly as possible -- even if there aren't any," points out the Göttingen researcher. "But if we smell a fragrance reminiscent of wine, we immediately see the cup in the picture. This allows us to quickly adjust to things that we did not expect, changing the focus of our attention."

Next, the scientists want to test the model on networks with a more realistic anatomy. They also hope that the findings inspire future experimental studies, as Battaglia says: "It would be fantastic if, in some years, certain brain areas could be stimulated so finely and precisely that the theoretically predicted effects can be measured through imaging methods."


Story Source:

The above story is based on materials provided by Max-Planck-Gesellschaft. Note: Materials may be edited for content and length.


Journal Reference:

  1. Demian Battaglia, Annette Witt, Fred Wolf, Theo Geisel. Dynamic Effective Connectivity of Inter-Areal Brain Circuits. PLoS Computational Biology, 2012; 8 (3): e1002438 DOI: 10.1371/journal.pcbi.1002438

Cite This Page:

Max-Planck-Gesellschaft. "Highly flexible despite hard-wiring: Even slight stimuli change the information flow in the brain." ScienceDaily. ScienceDaily, 23 March 2012. <www.sciencedaily.com/releases/2012/03/120323205339.htm>.
Max-Planck-Gesellschaft. (2012, March 23). Highly flexible despite hard-wiring: Even slight stimuli change the information flow in the brain. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2012/03/120323205339.htm
Max-Planck-Gesellschaft. "Highly flexible despite hard-wiring: Even slight stimuli change the information flow in the brain." ScienceDaily. www.sciencedaily.com/releases/2012/03/120323205339.htm (accessed July 23, 2014).

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