Split-brain patients: Visual biases for faces

Prete, Giulia; Tommasi, Luca

doi:10.1016/bs.pbr.2018.06.006

Cited by 17 publications

(8 citation statements)

References 112 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because visual images presented in a unilateral visual field are primarily processed in the contralateral hemisphere 24 , we compared the RT required to detect normal expressions and anti-expressions between intact- and resected-hemisphere stimulation conditions. This visual half-field paradigm has been shown to effectively reveal the emotional and social processing profiles in one hemisphere of healthy participants 25 – 31 , split-brain patients 32 – 36 , and patients with unilateral medial temporal structure resection 37 , 38 . To confirm the emotional impact of normal expressions and anti-expressions, we also obtained subjective ratings of the stimuli from the patients, in terms of valence and arousal, and also investigated familiarity and naturalness as possible cognitive confounding factors 39 .…”

Section: Introductionmentioning

confidence: 99%

Impairment of emotional expression detection after unilateral medial temporal structure resection

Sato¹,

Usui

Sawada

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Detecting emotional facial expressions is an initial and indispensable component of face-to-face communication. Neuropsychological studies on the neural substrates of this process have shown that bilateral amygdala lesions impaired the detection of emotional facial expressions. However, the findings were inconsistent, possibly due to the limited number of patients examined. Furthermore, whether this processing is based on emotional or visual factors of facial expressions remains unknown. To investigate this issue, we tested a group of patients (n = 23) with unilateral resection of medial temporal lobe structures, including the amygdala, and compared their performance under resected- and intact-hemisphere stimulation conditions. The participants were asked to detect normal facial expressions of anger and happiness, and artificially created anti-expressions, among a crowd with neutral expressions. Reaction times for the detection of normal expressions versus anti-expressions were shorter when the target faces were presented to the visual field contralateral to the intact hemisphere (i.e., stimulation of the intact hemisphere; e.g., right visual field for patients with right hemispheric resection) compared with the visual field contralateral to the resected hemisphere (i.e., stimulation of the resected hemisphere). Our findings imply that the medial temporal lobe structures, including the amygdala, play an essential role in the detection of emotional facial expressions, according to the emotional significance of the expressions.

show abstract

Section: Introductionmentioning

confidence: 99%

Impairment of emotional expression detection after unilateral medial temporal structure resection

Sato¹,

Usui

Sawada

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…As a consequence of split-brain research in patients with drug-refractory epilepsy after callosotomy (ie, surgical dissection of CC), the initial assumption of hemispherical independence was replaced by the concept of asymmetric localisation of functional domains within the bilaterally organised brain 3. While historically the term ‘split-brain’ applied to patients after callosotomy,4 nowadays it refers more generally to the state after isolated (ie, not affecting adjacent regions) functional disruption of the callosal connections. Callosal lesions can be provoked by various etiologies (eg, neoplastic, vitamin B1 deficiency, cytotoxic non-ischaemic, vascular).…”

Section: Introductionmentioning

confidence: 99%

“…Splenial lesions result in hemialexia and optic aphasia regarding information presented in the left visual field 8. These disconnection symptoms are understood to be the result of an imbalance in the interhemispheric information exchange via the CC and the other cerebral commissures 4…”

Section: Introductionmentioning

confidence: 99%

Split-brain syndrome after subarachnoid haemorrhage

Abbuehl,

Lippert,

Hakim

2024

BMJ Case Rep

View full text Add to dashboard Cite

We present the case of a patient with extensive ischaemia of the corpus callosum (CC) including all its anatomical subdivisions, caused by a ruptured aneurysm of the anterior cerebral artery (ACA). This resulted in subarachnoid haemorrhage (SAH) and subsequently in cerebral vasospasm. The aneurysm was coiled, the vasospasm treated with repetitive intra-arterial spasmolysis and the patient then received intensive neurorehabilitative care. The case is an example of ischaemic infarction, which happens rarely in the CC after SAH, and even more rarely affects the CC along its entire length. The case is further remarkable for the resulting nearly complete and isolated split-brain syndrome: CC disconnection syndromes are only exceptionally seen after vascular callosal damage because they are most often overshadowed by symptoms resulting from coaffected adjacent brain areas.

show abstract

“…At a neurophysiological level, the behavioral preference for the use of one side of the body corresponds to a contralateral hemispheric superiority in motor control, due to the crossed motor (and sensory) nervous pathways in humans [12]. This means that if a person is strongly right-lateralized (right-hander), her/his left hemisphere is more competent than the right hemisphere either in fine motor control, or in strength, or in both of them.…”

Section: Introductionmentioning

confidence: 99%

Laterality in Children: Evidence for Task-Dependent Lateralization of Motor Functions

Bondi

Prete

Malatesta

et al. 2020

IJERPH

Self Cite

View full text Add to dashboard Cite

The behavioral preference for the use of one side of the body starts from pre-natal life and prompt humans to develop motor asymmetries. The type of motor task completed influences those functional asymmetries. However, there is no real consensus on the occurrence of handedness during developmental ages. Therefore, we aimed to determine which motor asymmetries emerged differently during childhood. A total sample of 381 children in grades 1 to 5 (6–11 years old) of primary school were recruited and tested for two fine coordination tasks (Floppy, led by dexterity, and Thumb, led by speed-dominated skills) and handgrip strength (HS). Data about their handedness, footedness and sports participation were also collected. Children performed better with their dominant side, especially for the Floppy and HS tests. The asymmetries were more marked in right-handed children and did not differ by age, gender or type of sport. Our findings support the thesis of a functional lateralization in complex coordinative tasks and in maximal strength during developmental ages. Furthermore, our findings extend the evidence of a stronger lateralization in right-handed individuals, demonstrating it at a functional level in primary school children performing motor tasks. Fine motor skills allow a “fine” understanding of developmental trajectories of lateralized behavior.

show abstract

Split-brain patients: Visual biases for faces

Cited by 17 publications

References 112 publications

Impairment of emotional expression detection after unilateral medial temporal structure resection

Impairment of emotional expression detection after unilateral medial temporal structure resection

Split-brain syndrome after subarachnoid haemorrhage

Laterality in Children: Evidence for Task-Dependent Lateralization of Motor Functions

Contact Info

Product

Resources

About