R. Hichwa

Publications171
h-index57
Citations13,127
Highly Influential Citations557
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Subcortical and cortical brain activity during the feeling of self-generated emotions
TLDR
The hypothesis that the process of feeling emotions requires the participation of brain regions that are involved in the mapping and/or regulation of internal organism states is tested, indicating the close relationship between emotion and homeostasis.
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A neural basis for lexical retrieval
Nature 380, 499-505 (1996) AN ambiguity was introduced during editing into the opening sentence of the heading of this Article. This should read "Two parallel studies, one conducted in neurological…
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A neural basis for lexical retrieval
TLDR
Two parallel studies using positron emission tomography indicate that the normal process of retrieving words that denote concrete entities depends in part on multiple regions of the left cerebral hemisphere, located outside the classic language areas.
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Remembering the past: two facets of episodic memory explored with positron emission tomography.
TLDR
Results indicate that free-ranging mental activity (random episodic memory) produces large activations in association cortex and may reflect both active retrieval of past experiences and planning of future experiences, and which permit human beings to experience personal identity, consciousness, and self-awareness.
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Cerebral blood flow changes associated with attribution of emotional valence to pleasant, unpleasant, and neutral visual stimuli in a PET study of normal subjects.
TLDR
Observing and assigning emotional value to unpleasant stimuli produced activations in subcortical limbic regions, whereas evaluation of pleasant stimuli produced activateations in cortical limbic areas, consistent with the notion of a subCortical and archaic danger recognition system and a system detecting pleasantness in events and situations that is phylogenetically younger.
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Neural Correlates of Naming Actions and of Naming Spatial Relations
TLDR
The objective was to test the following hypothesis: that the salient neural activity associated with naming actions and spatial relations occurs in left frontal operculum and left parietal association cortices, but not in the left inferotemporal cortices (IT) or in the right parietal Association cortices.
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Schizophrenia and cognitive dysmetria: a positron-emission tomography study of dysfunctional prefrontal-thalamic-cerebellar circuitry.
TLDR
Results support a role for the cerebellum in cognitive functions and suggest that patients with schizophrenia may suffer from a "cognitive dysmetria" due to dysfunctional prefrontal-thalamic-cerebellar circuitry.
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A role for left temporal pole in the retrieval of words for unique entities
TLDR
In support of the notion that activity in the left temporal pole is linked to the level of specificity of word retrieval rather than the conceptual class to which the stimulus belongs, normal subjects were asked to name at unique level entities from two conceptual categories: famous landmarks and famous faces.
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Cerebral blood flow and personality: a positron emission tomography study.
TLDR
The findings of the study lend support to the notion that introversion is associated with increased activity in frontal lobe regions and suggest that individual differences in introversion and extraversion are related to differences in a fronto-striato-thalamic circuit.
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Hypofrontality in schizophrenia: distributed dysfunctional circuits in neuroleptic-naïve patients
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