Investigation of neuronal structures and networks on the modulation of decision-making and impulse control by temporary inactivation via local microinfusion of the GABAA receptor agonist muscimol in rats
|Other Titles:||Untersuchung neuronaler Strukturen und Netzwerke bei der Modulation von Entscheidungsfindung und Impulskontrolle anhand temporärer Inaktivierung durch lokale Mikroinfusion des GABAA-Rezeptor-Agonisten Muscimol bei Ratten||Authors:||Feja, Malte||Supervisor:||Koch, Michael||1. Expert:||Koch, Michael||2. Expert:||Dicke, Ursula||Abstract:||
Impulsivity is determined by deficits in decision-making (impulsive choice) and impulse control (impulsive action). Using reversible inactivation via microinfusion of the GABAA receptor agonist muscimol the thesis aimed to elucidate the participation of the ventral medial prefrontal cortex (vmPFC), the nucleus accumbens (NAc) core and shell as well as the connections of the vmPFC and the NAc subregions in both forms of impulsivity in rats. The present results indicate that impulse control is regulated by both structures, while impulsive decision-making is principally modulated by the NAc, and not the vmPFC. The current investigation suggests both functional dissociations and close interactions between the vmPFC and NAc in terms of impulsive action, depending on the involved accumbal subregion. The NAc shell constitutes the critical region mediating both types of impulsivity, whereas the NAc core seems to be implicated in non-specific impairments beyond impulsive choice. Consequently, this work points towards various specific frontostriatal systems differentially contributing to delay-based decision-making and particularly impulse control.
|Keywords:||ventral medial prefrontal cortex, nucleus accumbens, frontostriatal system, five-choice serial reaction time task, delay-discounting, T-maze, impulsivity||Issue Date:||17-Sep-2014||URN:||urn:nbn:de:gbv:46-00103917-18||Institution:||Universität Bremen||Faculty:||FB2 Biologie/Chemie|
|Appears in Collections:||Dissertationen|
checked on Sep 27, 2020
Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.