Academic literature on the topic 'Posterior insular cortex'

Within the framework of the embodiment of time, this chapter presents accumulating evidence of how interoception and associated brain networks process time. Functional MRI studies have shown that climbing neural activation in the posterior insular cortex correlates with stimulus duration in a time-estimation task in the multiple-second range. Given the close connection between the insular cortex and ascending body signals, the authors suggest that the accumulation of physiological changes in body states is the basis for the subjective impression of duration. Psychophysiological findings reveal

This chapter presents evidence that supports the idea that activity in the interoceptive cortex in the posterior insula is re-represented, integrated, and transformed in the middle and anterior portions of human insular cortex to generate the feelings that one experiences. It also explains how vivid feelings are generated in a model of interoceptive integration that engenders homeostatic sentience. The emergence of bodily feelings provides the foundation for the generation of emotional feelings in the anterior insular cortex as if they are feelings from the body. The chapter then describes the evidence for the embodiment of emotional feelings, including the recent use of Botox to elucidate central mechanisms for the facial feedback hypothesis.

In the context of temporal lobe epilepsy (TLE), there are different scenarios where a stereo-electroencephalographic (SEEG) study must be strongly considered. This chapter reviews these situations, which include bitemporal epilepsy, unilateral lesional and non-lesional TLE, temporal ‘plus’ epilepsy (TPE), and pseudo-TLE. It also emphasizes why SEEG is especially appropriate to adequately sample all possible ictal generators, either temporal (amygdala, hippocampus, entorhinal cortex, or temporal neocortex) or extratemporal (insula, orbitofrontal cortex, or posterior cingulate gyrus). It includes illustrative cases explaining why and how SEEG studies are designed, and provides examples of SEEG schemes and traces.

Using functional magnetic resonance imaging (fMRI) or positron emission tomography (PET), much knowledge has been gained in understanding how the brain is activated during controlled experiments of language tasks in educated healthy subjects and in uneducated healthy subjects. While previous studies have compared performance between alphabetic subjects, few data were about Chinese-speaking individuals. In alphabetic subjects, studies indicate that the literates surpass the illiterates, especially in tasks involving phonological processing, and that different activation regions in fMRI are located between Broca’s area and the inferior parietal cortex, as well as the posterior-mid-insula bridge between Wernicke’s and Broca’s area. In Chinese subjects, the results were shown in silent word recognition tasks (the left inferior/middle frontal gyrus and bilateral superior temporal gyri) and in silent picture-naming tasks (the bilateral inferior/middle fontal gyri and left limbic cingulated gyrus). In this study, the authors use some recent fMRI data to investigate language processing in the human brain of literate and illiterate subjects.