Our mind makes choices primarily based on direct associations between stimuli in our surroundings, nevertheless it usually additionally does so primarily based on occasions that originally seem unrelated. How does it obtain this? A latest study by the Cellular Mechanisms in Physiological and Pathological Behavior Research Group on the Hospital del Mar Research Institute, published in Proceedings of the National Academy of Sciences, presents new insights into this course of and identifies the mind areas concerned.
Using observations in mice, led primarily by first creator and Ph.D. scholar José Antonio González Parra and supervised by Dr. Arnau Busquets, the analysis workforce was capable of decide the mechanisms concerned in how the mind makes choices primarily based on oblique associations between completely different stimuli. That is, as an alternative of instantly associating a selected stimulus with a rewarding or aversive scenario, the mind establishes connections between two or extra stimuli.
Dr. Busquets explains, “The undertaking goals to grasp how the mind allows us to make choices primarily based on oblique relationships between stimuli in our surroundings.”
In this context, the mice had been subjected to numerous behavioral checks. They had been skilled to affiliate one smell-banana-with a candy style, and one other smell-almond-with a salty style. Later, a detrimental stimulus was related to the scent of banana. From that mark on, the mice rejected the candy style, which was linked to the banana scent and thus carried a detrimental connotation.
In different phrases, “they fashioned an oblique affiliation between the candy style and the aversive stimulus via its hyperlink to a selected scent,” explains Busquets.
The position of the amygdala
Using genetic strategies delivered through viral vectors, the researchers had been capable of observe which areas of the mice’s brains had been activated all through the method of encoding and consolidating the associations. They discovered that the amygdala, a mind area related to responses akin to concern and anxiousness and concerned in sure psychological issues like psychosis and PTSD, was activated when the mice linked olfactory and style stimuli.
At the identical time, they recognized different mind areas that had been additionally concerned and interacted with the amygdala. Thanks to imaging strategies, they had been capable of set up a connection between these areas and part of the cerebral cortex.
“We have recognized a mind circuit that controls associations between stimuli and permits for these oblique associations,” says Dr. Busquets. They additionally confirmed that if amygdala exercise was inhibited whereas the mice had been uncovered to the stimuli, the animals had been unable to kind these oblique associations.
As Dr. Arnau Busquets explains, the researchers imagine that the mind circuits concerned in decision-making processes in people are just like these in mice. Therefore, the information obtained on this newly revealed study might be related for treating sure psychological issues linked to amygdala exercise.
“Alterations in these oblique associations kind the idea of varied psychological issues,” he provides. “Understanding the mind circuits concerned in these complicated cognitive processes will help us design therapeutic methods for people.”
In this sense, future approaches might embrace mind stimulation or modulation of exercise in these areas in folks with PTSD or psychotic signs.
More data:
Jose Antonio González-Parra et al, Projecting neurons from the lateral entorhinal cortex to the basolateral amygdala mediate the encoding of incidental odor–style associations, Proceedings of the National Academy of Sciences (2025). DOI: 10.1073/pnas.2502127122
Provided by
IMIM (Hospital del Mar Medical Research Institute)
Citation:
How the mind hyperlinks unrelated occasions: New insights into the amygdala’s position in decision-making ( 27)
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