Alcohol addiction is closely linked to dysregulation of limbic networks, particularly the amygdala, hippocampus, insula and temporal association cortex. These structures govern emotional evaluation, interoceptive perception of craving, context-dependent learning and the integration of emotion into episodic memory. A practice-oriented neurofeedback approach that specifically targets temporal sites in the infralow frequency range can address precisely these processes. The following sections first outline the anatomical and neuropsychological foundations of these networks and then present a hypothetical protocol from clinical practice together with initial observations.
Neuroanatomical and Neurophysiological Foundations
The amygdala, hippocampus, insular cortex and temporal association cortex form a densely interconnected limbic–paralimbic network within the medial and anterior temporal lobe as well as the insular region.
Amygdala – Hippocampus
The connections are reciprocal and topographically organised. The ventral (anterior) hippocampus (CA1 and subiculum) projects strongly to the basolateral nuclear complex (BLA) and the central nucleus of the amygdala. Conversely, the amygdala (especially the BLA) innervates the ventral hippocampus and the entorhinal cortex. These pathways run partly directly and partly via parahippocampal relays (perirhinal and entorhinal cortex). Functionally they serve the emotional modulation of hippocampal memory processes and context-dependent fear conditioning.
Amygdala – Insula
Massive reciprocal connections exist between the amygdaloid complex and the insulae. The anterior (agranular and dysgranular) insula projects particularly densely to the lateral, basal and central amygdaloid nuclei; the posterior insula projects more strongly to the lateral and central nuclei. In turn, the amygdala sends dense projections back to the agranular and dysgranular insula. Anatomically these fibres travel, among other routes, via the extreme capsule and the temporo-insular projection system. Neurophysiologically this network integrates interoceptive signals (visceral, gustatory, pain-related) with emotional valence.
Amygdala – Temporal Association Cortex
The temporal pole (area 38), the perirhinal cortex (areas 35/36), the entorhinal cortex and rostral portions of the inferior temporal cortex (TE) maintain strong reciprocal connections with the lateral and basal amygdaloid nuclei. Projections are densest in the medial temporal pole and the perirhinal/entorhinal areas. Additional direct fibre bundles exist (amygdalo-temporal fascicle, portions of the uncinate fasciculus). These connections enable the emotional evaluation of complex sensory and polymodal information.
Hippocampus – Insula / Temporal Association Cortex
Via the entorhinal cortex the hippocampus receives extensive polymodal input from temporal association areas and the insula. The subiculum projects back to temporal association areas. The insula is indirectly linked to the hippocampus through parahippocampal and entorhinal relays and contributes interoceptive and emotional contextual information to episodic encoding.
Summary of Circuit Principles
Sensory and interoceptive information reaches the lateral amygdaloid nucleus via temporal association areas and the insula → is emotionally evaluated in the BLA and linked with hippocampal context → the central nucleus drives autonomic and behavioural outputs. Simultaneously the amygdala and insula modulate hippocampal memory consolidation.
Neuropsychological Foundations
Together these regions constitute the neuropsychological substrate for emotional evaluation, interoceptive perception, context-dependent learning and the integration of emotion into episodic memory – processes that are centrally disturbed in addictive disorders.
Amygdala
Central structure for assigning emotional valence (both positive and negative), fear conditioning and the generation of stress and reward responses. It modulates attention and enhances the encoding of emotionally salient stimuli. In addiction a hyper-reactivity to addiction-related cues and a dysregulation of the stress response (extended amygdala) are frequently observed.
Hippocampus
Responsible for the formation and retrieval of episodic and contextual memories. The ventral/anterior portion is closely linked to emotional and stress-related functions, while the dorsal/posterior portion is more involved in spatial-cognitive performance. The amygdala modulates the hippocampal consolidation of emotional memories (e.g. addiction-associated contexts).
Insular Cortex
Plays a central role in interoception (perception of bodily states), the generation of craving and the integration of bodily feelings into subjective emotional experience. The anterior insula forms part of the salience network and is crucial for the conscious awareness of urge and withdrawal symptoms. Lesions of the insula can drastically reduce craving.
Temporal Association Cortex (especially temporal pole and anterior temporal areas)
Processes complex polymodal and semantic information and links it with emotional meaning. The temporal pole is involved in social cognition, person and object recognition and the emotional colouring of memories. Together with the amygdala it forms the temporo-amygdalar network that integrates emotion with semantic/episodic knowledge.
Functional Integration in Addiction
Hyperactive amygdala and insula → increased cue reactivity and craving
Disturbed hippocampal contextual processing → difficulty extinguishing addiction-related memories
Reduced prefrontal regulation over these networks → deficits in impulse control
A Practice-Based Proof-of-Concept Attempt
Against the background of the anatomical and neuropsychological relationships described above, a temporally focused infralow neurofeedback protocol was explored in clinical practice.
Protocol
Nineteen patients (n = 19) with problematic alcohol consumption received a standardised Cygnet neurofeedback protocol. A larger control cohort (n > 122) from ongoing clinical work without this specific temporal infralow protocol served as comparison.
Each session began with 15 minutes of bipolar neurofeedback at T3–T4 in the infralow frequency range (< 0.1 Hz). Inhibition was guided by clinical signs of elevated high-beta activity (muscle tension, inner restlessness) as well as delta-related signs (fatigue, drowsiness). The electrodes were then moved to the temporal keyhole positions and infralow feedback was given for 40 minutes. The session concluded with a further 5 minutes at T3–T4.
In seven patients who drank more than two glasses of red wine daily, self-directed aggression, self-disgust and the feeling of not using their time meaningfully already appeared during the temporal training in the first session. In these patients the final T3–T4 phase was extended to a total of 30 minutes until the auto-aggressive affects subjectively subsided.
Clinical Observations
The seven patients with high daily consumption (three in high-performance professions – physician, manager, concert musician – and four in other occupational situations, one unemployed for four years) developed a clear aversion to red wine and spirits already after the second session. After completion of ten sessions they reported that red wine tasted like vinegar and that other alcoholic beverages had also lost their appeal. Withdrawal symptoms did not occur; instead sleep improved. All wished to continue the training. Subsequently they received trauma-focused alpha-theta neurofeedback as well as general brain training. After six months they remained alcohol-abstinent. The manager reported a substantial improvement in quality of life; the physician joined Médecins Sans Frontières and became active in developing countries.
In the remaining twelve patients, who consumed more than two glasses of alcohol three times a week, symptom change was milder. Ten of them lost the taste for alcohol after approximately five sessions. After six months they reported drinking only occasional beer in moderation. No further feedback was available from the remaining two patients.
Possible (Hypothetical) Mechanisms of Action
The temporal keyhole electrode sites lie anatomically in close proximity to structures of the limbic network (amygdala, anterior temporal cortex, insula and hippocampal formations). Infralow frequencies have been associated with the regulation of arousal, interoceptive signals and the stabilisation of default-mode and salience networks. Targeted work at these positions may therefore modulate the emotional evaluation of addiction-relevant cues, the interoceptive perception of craving and the contextual binding of alcohol-associated memories. The rapid emergence of aversion and the loss of the positive taste component suggest a change in reward and valence processing – possibly via a recalibration of amygdalar and insular networks. The subsequent alpha-theta and trauma-focused work may further consolidate the newly gained emotional stability and support its integration into the autobiographical self.
Dr. Zeliha Yanıkömeroğlu, MD
References
Anatomy / Neurophysiology
Höistad M, Barbas H. Sequence of information processing for emotions through pathways linking temporal and insular cortices with the amygdala. Frontiers in Systems Neuroscience. 2008.
McDonald AJ, Mott DD. Functional neuroanatomy of amygdalohippocampal interconnections and their role in learning and memory. Journal of Neuroscience Research. 2017.
Sah P et al. The amygdaloid complex: anatomy and physiology. Physiological Reviews. 2003.
Mesulam MM, Mufson EJ. Insula of the old world monkey. Journal of Comparative Neurology. 1982.
Ghashghaei HT, Barbas H. Pathways for emotion: interactions of prefrontal and anterior temporal pathways. Neuroscience. 2002.
Neuropsychology
Koob GF, Volkow ND. Neurocircuitry of addiction. Neuropsychopharmacology. 2010.
Naqvi NH, Bechara A. The insula and drug addiction: an interoceptive view of pleasure, urges, and decision-making. Brain Structure and Function. 2010.
Phelps EA. Human emotion and memory: interactions of the amygdala and hippocampal complex. Current Opinion in Neurobiology. 2004.
Craig AD. How do you feel – now? The anterior insula and human awareness. Nature Reviews Neuroscience. 2009.
Catani M, Dell’Acqua F, Thiebaut de Schotten M. A revised limbic system model for memory, emotion and behaviour. Neuroscience & Biobehavioral Reviews. 2013.
Robbins TW et al. Drug addiction and the memory systems of the brain. Annals of the New York Academy of Sciences. 2008.
About the Author
Dr. Zeliha Yanıkömeroğlu, MD is a medical doctor and neurosurgeon specializing in clinical neurofeedback and neuroregulation therapies. Her work bridges advanced neurophysiology, infralow frequency (ILF) training protocols, and continuous performance testing. She consults on complex clinical presentations including addiction, OCD, and attentional dysregulation.
Clinical Note on Tracking Outcomes: Longitudinal changes in craving and consumption patterns, as described in this hypothetical protocol, are best documented through consistent, structured self-report rather than relying on memory alone. Clinicians utilizing the EEG Expert platform can track craving intensity, consumption patterns, and session-by-session self-reports via the integrated Symptom Tracking system.
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