Crossed aphasia: an analysis of the symptoms,their frequency,and a comparison with left-hemisphere aphasia symptomatology

This study presents a thorough analysis of published crossed aphasia (CA) cases, including for the first time the cases published in Japanese. The frequency of specific symptoms was determined, and symptomatology differences based on gender, familial sinistrality, and CA subtype were investigated. Results suggested that the CA population is comparable to the left-hemisphere patient population. However, male were significantly more likely than female CA subjects to show a positive history of familial sinistrality. Typical right-hemisphere (i.e., nonlanguage-dominant) symptoms were frequent but rarely carefully reported or assessed. Results are compared with previous CA reviews and left-hemisphere aphasia. Suggestions for a more systematic assessment of the CA symptomatology are presented.     

Who Shake Their Legs and Bite Their Nails? Self-Reported Repetitive Behaviors and Big Five Personality Traits

Nail-biting and leg-shaking are two common repetitive behaviors with significant consequences for health and social standing. Despite their prevalence, significance, and known links to various psychological disorders such as Tourette spectrum, no previous research has examined their connection to personality traits. We examined the links between the Big Five personality traits and self-reported tendencies of leg-shaking and nail-biting in a sample of 5328 Japanese adults (2127 females), ranging in age from 18–71 years (mean 49.9). Individuals were assessed with the Ten-Item Personality Inventory and reported on their nail-biting and leg-shaking tendencies using a five-point Likert scale. Correlation and regression analyses revealed significant negative associations between both the tendencies and Agreeableness and Conscientiousness. Males reported engaging in the behaviors more than females and younger individuals more than older. Neuroticism was positively correlated with leg-shaking only in males. Introversion and low Agreeableness correlated with nail-biting in males, while Openness correlated with nail-biting in females. Discussion focuses on social norms that dictate inhibiting both behaviors.     

Deliberate Self‐Harm in Adolescents Aged 12–18: A Cross‐Sectional Survey of 18,104 Students

Little is known about accurate prevalence and associated factors of deliberate self‐harm (DSH) among adolescents in Asian countries. In this study, the prevalence and associated factors of DSH among adolescents in Japan were examined. Data were derived from a cross‐sectional survey using an anonymous self‐report questionnaire and enrolling 8,620 adolescents aged 12–15 and 9,484 aged 15–18. DSH in the previous 12 months was reported by 3.3% (95% CI, 2.9–3.7) of junior and 4.3% (3.9%–4.7%) of senior high school respondents. The prevalence was more than four times as high among girls as among boys for both age groups. DSH was further strongly associated with having suicidal thoughts, having depression/anxiety symptoms, and having used recreational drugs. These associated factors were similar for both sexes and for both older and younger teenagers. A substantial minority of adolescents present with DSH, even among those aged 12–15. The prevalence of DSH in Japan was in the lower ranges of those reported for Western countries. The identified associated factors were not dissimilar from those reported in the West.     

Belief in group interdependence: Facilitating evacuee–host interactions after the Fukushima nuclear accident

After the 2011 Fukushima nuclear accident, intercultural friction and aversion arose between evacuees and host community residents in relocation areas. We examined whether a belief in group interdependence—the extent to which an individual believes that group function is realized through interdependence with related other groups—is consistent with positive interactions between evacuees and hosts. A door-to-door survey of 77 evacuees and 75 hosts revealed that residents with an integrated social identity interacted favorably with both ingroup and outgroup members, and that a belief in group interdependence was consistent with the integration of social identity between the evacuee and host communities. Those findings suggest that a belief in group interdependence can reduce intercultural conflict by allowing both immigrants and host residents to acquire an integrated social identity without the dilemma of internalizing different cultures into an individual's mind.     

Preliminary evidence for selective cortical responses to music in one-month-old infants

Prior studies have observed selective neural responses in the adult human auditory cortex to music and speech that cannot be explained by the differing lower-level acoustic properties of these stimuli. Does infant cortex exhibit similarly selective responses to music and speech shortly after birth? To answer this question, we attempted to collect functional magnetic resonance imaging (fMRI) data from 45 sleeping infants (2.0- to 11.9-weeks-old) while they listened to monophonic instrumental lullabies and infant-directed speech produced by a mother. To match acoustic variation between music and speech sounds we (1) recorded music from instruments that had a similar spectral range as female infant-directed speech, (2) used a novel excitation-matching algorithm to match the cochleagrams of music and speech stimuli, and (3) synthesized “model-matched” stimuli that were matched in spectrotemporal modulation statistics to (yet perceptually distinct from) music or speech. Of the 36 infants we collected usable data from, 19 had significant activations to sounds overall compared to scanner noise. From these infants, we observed a set of voxels in non-primary auditory cortex (NPAC) but not in Heschl's Gyrus that responded significantly more to music than to each of the other three stimulus types (but not significantly more strongly than to the background scanner noise). In contrast, our planned analyses did not reveal voxels in NPAC that responded more to speech than to model-matched speech, although other unplanned analyses did. These preliminary findings suggest that music selectivity arises within the first month of life. A video abstract of this article can be viewed at https://youtu.be/c8IGFvzxudk .

Research Highlights

• Responses to music, speech, and control sounds matched for the spectrotemporal modulation-statistics of each sound were measured from 2- to 11-week-old sleeping infants using fMRI.
• Auditory cortex was significantly activated by these stimuli in 19 out of 36 sleeping infants.
• Selective responses to music compared to the three other stimulus classes were found in non-primary auditory cortex but not in nearby Heschl's Gyrus.
• Selective responses to speech were not observed in planned analyses but were observed in unplanned, exploratory analyses.