scholarly journals Deep dyslexia and the right-hemisphere hypothesis: What’s left?

1981 ◽  
Vol 18 (4) ◽  
pp. 176-178 ◽  
Author(s):  
Derek Besner
Keyword(s):  
Right Hemisphere ◽  
Right Hemisphere Hypothesis ◽  
Deep Dyslexia ◽  
The Right

Right-hemisphere reading in a case of developmental deep dyslexia

2007 ◽  
Vol 60 (9) ◽  
pp. 1187-1196 ◽  
Author(s):  
Nicola J. Pitchford ◽  
Elaine Funnell ◽  
Bianca De Haan ◽  
Paul S. Morgan
Keyword(s):  
Oral Reading ◽  
Right Hemisphere ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Imaging Studies ◽  
Function Words ◽  
Phonological Skills ◽  
Right Hemisphere Hypothesis ◽  
Deep Dyslexia ◽  
The Right

The right-hemisphere hypothesis of deep dyslexia has received support from functional imaging studies of acquired deep dyslexia following damage to the left cerebral hemisphere, but no imaging studies of cases of developmental deep dyslexia, in which brain damage is not suspected, have been reported. In this paper, we report the first evidence of right hyperactivation in an adult case of developmental deep dyslexia. Hyperactivation was observed in the right inferior frontal cortex during functional magnetic resonance imaging (fMRI) of the oral reading of imageable content words and nonwords to which imageable lexical responses were frequently made. No evidence of right hyperactivation was observed in the oral reading of function words, nor during the naming of imageable words in response to pictured objects. The results reveal strategic and selective use of right-hemisphere functions for particular types of written stimuli. We propose that children with developmental deep dyslexia compensate for their lack of phonological skills by accessing right-hemisphere imageable associations that provide a mnemonic for linking written forms to spoken names.

An examination of the right-hemisphere hypothesis of the lateralization of emotion

2005 ◽  
Vol 57 (2) ◽  
pp. 210-213 ◽  
Author(s):  
Stephen D. Smith ◽  
M. Barbara Bulman-Fleming
Keyword(s):  
Right Hemisphere ◽  
Right Hemisphere Hypothesis ◽  
The Right

A Functional Neuroimaging Description of Two Deep Dyslexic Patients

1998 ◽  
Vol 10 (3) ◽  
pp. 303-315 ◽  
Author(s):  
C. J. Price ◽  
D. Howard ◽  
K. Patterson ◽  
E. A. Warburton ◽  
K. J. Friston ◽  
...  
Keyword(s):  
Left Hemisphere ◽  
Word Processing ◽  
Right Hemisphere ◽  
Temporal Cortex ◽  
Inferior Temporal Cortex ◽  
Broca's Area ◽  
Enhanced Activity ◽  
Left Posterior ◽  
Deep Dyslexia ◽  
The Right

Deep dyslexia is a striking reading disorder that results from left-hemisphere brain damage and is characterized by semantic errors in reading single words aloud (e.g., reading spirit as whisky). Two types of explanation for this syndrome have been advanced. One is that deep dyslexia results from a residual left-hemisphere reading system that has lost the ability to pronounce a printed word without reference to meaning. The second is that deep dyslexia reflects right-hemisphere word processing. Although previous attempts to adjudicate between these hypotheses have been inconclusive, the controversy can now be addressed by mapping functional anatomy. In this study, we demonstrate that reading by two deep dyslexic patients (CJ and JG) involves normal or enhanced activity in spared left-hemisphere regions associated with naming (Broca's area and the left posterior inferior temporal cortex) and with the meanings of words (the left posterior temporo-parietal cortex and the left anterior temporal cortex). In the right-hemisphere homologues of these regions, there was inconsistent activation within the normal group and between the deep dyslexic patients. One (CJ) showed enhanced activity (relative to the normals) in the right anterior inferior temporal cortex, the other (JG) in the right Broca's area, and both in the right frontal operculum. Although these differential right-hemisphere activations may have influenced the reading behavior of the patients, their activation patterns primarily reflect semantic and phonological systems in spared regions of the left hemisphere. These results preclude an explanation of deep dyslexia in terms of purely right-hemisphere word processing.

scholarly journals Keep a Left Profile, Baby! The Left-Cradling Bias Is Associated with a Preference for Left-Facing Profiles of Human Babies

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 911 ◽  
Author(s):  
Gianluca Malatesta ◽  
Daniele Marzoli ◽  
Luca Tommasi
Keyword(s):  
Hemispheric Asymmetry ◽  
Right Hemisphere ◽  
Female Preference ◽  
Human Infant ◽  
Emotional Information ◽  
Face To Face ◽  
Empirical Success ◽  
Right Hemisphere Hypothesis ◽  
Left And Right ◽  
The Right

The left-cradling bias (LCB) refers to the (typically female) preference to hold an infant on the left side of one’s own body. Among the three main accounts proposed for such a phenomenon, namely the “handedness”, “heartbeat” and “hemispheric asymmetry” hypotheses, the latter has met with the greatest empirical success. Accordingly, the LCB would facilitate the communication of socio-emotional information through the right hemisphere of both the cradled and the cradling individual, and should emerge mainly in face-to-face interactions. In this regard, it should be noticed that when the infant’s body is oriented toward the cradler, the left or right side of their face is relatively more visible to left- and right-cradlers, respectively. Therefore, we hypothesized that the LCB might also be associated with a preference for left-facing profiles (i.e., those showing the left, and more expressive, hemiface/cheek) of human babies. In order to test our hypothesis, we assessed the cradling-side preferences of female participants, as well as their preference for the left- or right-facing profile of a human infant depicted in a drawing. Left-cradlers exhibited a significantly larger preference for the left-facing version of the drawing compared with right-cradlers, a finding further corroborating the right-hemisphere hypothesis.

scholarly journals Differential Hemispheric Lateralization of Emotions and Related Display Behaviors: Emotion-Type Hypothesis

2021 ◽  
Vol 11 (8) ◽  
pp. 1034
Author(s):  
Elliott D. Ross
Keyword(s):  
Left Hemisphere ◽  
Positive Emotions ◽  
Right Hemisphere ◽  
Research Data ◽  
Hemispheric Lateralization ◽  
Social Emotions ◽  
Right Hemisphere Hypothesis ◽  
The Right ◽  
The Brain ◽  
Emotion Type

There are two well-known hypotheses regarding hemispheric lateralization of emotions. The Right Hemisphere Hypothesis (RHH) postulates that emotions and associated display behaviors are a dominant and lateralized function of the right hemisphere. The Valence Hypothesis (VH) posits that negative emotions and related display behaviors are modulated by the right hemisphere and positive emotions and related display behaviors are modulated by the left hemisphere. Although both the RHH and VH are supported by extensive research data, they are mutually exclusive, suggesting that there may be a missing factor in play that may provide a more accurate description of how emotions are lateralization in the brain. Evidence will be presented that provides a much broader perspective of emotions by embracing the concept that emotions can be classified into primary and social types and that hemispheric lateralization is better explained by the Emotion-type Hypothesis (ETH). The ETH posits that primary emotions and related display behaviors are modulated by the right hemisphere and social emotions and related display behaviors are modulated by the left hemisphere.

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