التفاصيل البيبلوغرافية
| العنوان: |
First- and second-order phase transitions in electronic excitable units and neural dynamics under global inhibitory feedback. |
| المؤلفون: |
Minati, Ludovico1,2 (AUTHOR) lminati@ieee.org, Scarpetta, Silvia3,4 (AUTHOR), Andelic, Mirna5,6 (AUTHOR), Valdes-Sosa, Pedro A.1,7 (AUTHOR), Ricci, Leonardo8 (AUTHOR), de Candia, Antonio4,9 (AUTHOR) |
| المصدر: |
Chaos, Solitons & Fractals. May2024, Vol. 182, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*PHASE transitions, *NEURAL inhibition, *ELECTRONIC feedback, *NEURAL circuitry, *BIOELECTRONICS, *OPTOGENETICS, *COMPUTATIONAL neuroscience, *NEON |
| مستخلص: |
The diverse roles of inhibition in neural circuits and other dynamical networks are receiving renewed interest. Here, it is shown that increasing global inhibitory feedback leads to gradual rounding of first-order transition between dynamical phases, turning it into second-order transition. The effect is initially observed in an electronic model consisting of a bi-dimensional array of neon glow lamps, where global inhibition can be simply introduced through a resistor in series with the supply voltage. The experimental findings are confirmed using both an extended numerical model and a mean-field approximation, then replicated across different models of neural dynamics, namely, the Wilson–Cowan model and a network of leaky integrate-and-fire neurons. Across all these systems, a critical point is always found as a function of a pair of parameters controlling local excitability and global inhibition strength, and a general explanation revealing the roles of the shape of the activation function and voltage fluctuations versus the extinction time-scale is provided. It is speculated that the brain could use global inhibition as a versatile means of shifting between first- and second-order dynamics, addressing the conundrum regarding the coexistence in neural dynamics of phenomena stemming from both. Some reflections regarding the comparison with other physical systems and the possible physiological significance are offered, and a hypothetical setup for an optogenetics experiment on cultured neurons is put forward. • Global inhibitory feedback in an electronic model of neural dynamics is considered. • Gradual rounding of first-order into second-order transition is observed. • The phenomenon is explained using an extended model and a mean-field approximation. • Analogous results are obtained for individual spiking neurons and neural masses. • The brain might leverage this phenomenon to seamlessly shift between dynamical regimes. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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