Ictal hallucination and hemispheric specialization: Findings from 217 cases with a unilateral epileptic focus

Guimond, Anik; Braun, Claude M. J.; Daigneault, Rafaël

doi:10.1016/j.biopsycho.2009.06.010

Cited by 9 publications

(2 citation statements)

References 130 publications

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“…In fact however we believe that such a neurotransmitter-mediated mechanism is not the principal determinant of hemispheric specialization for psychic tonus effects reported here and elsewhere. Superficial cuts in rat cortex modulate psychic tonus without affecting neurotransmitter concentrations [1], and ictal visual hallucination results far more often from left foci [60]. This corroboration of hemispheric specialization for psychic tonus cannot be explained as a chronic and major change of neurotransmitter concentration in the brain after lesions.…”

Section: Discussionmentioning

confidence: 74%

Visual Hypo and Hypergnosia as Exemplars of Poles of Psychic Tonus in the Occipital Lobes: Multiple Case Analyses

Braun

Guimond

2008

Behavioural Neurology

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The “psychic tonus” model or PTM [1] of hemispheric specialization states that the left hemisphere is a psychic and behavioral activator and that the right hemisphere is an inhibitor. The PTM predicts that the tonus of visual representation ought to manifest hemispheric specialization in the occipital lobes. Specifically PTM predicts that pathological positive visual tonus (visual hallucination) ought to be associated more frequently with right occipital lesions. PTM also predicts that pathological negative visual tonus (loss of visual imagery) ought to result more often from left occipital lesions. We reviewed 78 cases of post lesion hallucination and 12 cases of post lesion loss of evocation of images, all following a unilateral lesion. Analyses of these relevant previously published cases support the predictions. In accordance with previously published demonstrations of hemispheric specialization for auditory tonus in the temporal lobes and for somesthetic tonus in the parietal lobes, the present findings extend the psychic tonus model of hemispheric specialization to vision in the occipital lobes.

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Section: Discussionmentioning

confidence: 74%

Visual Hypo and Hypergnosia as Exemplars of Poles of Psychic Tonus in the Occipital Lobes: Multiple Case Analyses

Braun

Guimond

2008

Behavioural Neurology

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“…Ictal fear or ictal panic is the most frequently reported ictal psychiatric symptom. It can be a common manifestation of partial seizures originating in right mesial temporal lobe structures [16], representing a simple partial seizure or an aura followed by a complex partial seizure or a secondarily generalized tonic-clonic seizure. Fear is reported as an aura by 10%-15% patients with partial seizures [13].…”

Section: Ictal Symptomsmentioning

confidence: 99%

Ictal and Peri-Ictal Psychopathology

Mula

Monaco

2011

Behavioural Neurology

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Patients with epilepsy may experience psychiatric symptoms preceding the seizure (pre-ictal), following the seizure (post-ictal), independently of seizure occurrence (interictal), or as an expression of the seizure (ictal). Compared to interictal, peri-ictal psychiatric symptoms are less investigated and recognized. However, they contribute substantially to disability and distress among people with epilepsy.The relationship between interictal and periictal symptoms is still largely unknown but it seems that they are intimately related in epilepsy. Greater appreciation and understanding of the periictal period is clinically important, providing a model for understanding basic mechanisms underlying mood and thought disorders and the substrates of cognition, volition, emotion, and consciousness.The present paper is aimed at reviewing major psychiatric symptoms that may occur around the ictus with special attention to clinical descriptions and relationships with interictal psychopathology.

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Hallucinations, Neural Basis of

Goldsworthy

Whitaker

2015

International Encyclopedia of the Social &Amp; Behavioral Sciences

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Ictal hallucination and hemispheric specialization: Findings from 217 cases with a unilateral epileptic focus

Cited by 9 publications

References 130 publications

Visual Hypo and Hypergnosia as Exemplars of Poles of Psychic Tonus in the Occipital Lobes: Multiple Case Analyses

Visual Hypo and Hypergnosia as Exemplars of Poles of Psychic Tonus in the Occipital Lobes: Multiple Case Analyses

Ictal and Peri-Ictal Psychopathology

Hallucinations, Neural Basis of

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