Prenatal thumb sucking is related to postnatal handedness

  title={Prenatal thumb sucking is related to postnatal handedness},
  author={Peter G. Hepper and Deborah L. Wells and Catherine Lynch},
This study followed-up 75 individuals who were observed sucking their thumb as fetuses and examined their handedness, assessed by a modified version of the Edinburgh Handedness Inventory, at 10-12 years of age. Of 60 right-handed fetuses, all were right-handed postnatally; 10 of 15 left-handed fetuses were left-handed and five right-handed. Male left thumb sucking fetuses were more likely to be right-handed children than females. The study indicates that the prenatal exhibition of lateralised… 
The origin of human handedness and its role in pre-birth motor control
This work proposed an approach that explains postnatal handedness starting from 18 gestational weeks using a kinematic analysis of different fetal arm movements recorded during ultrasonography, and revealed that both right-handed and left-handed fetuses were faster to reach to targets requiring greater precision with their dominant hand.
Is Handedness at Five Associated with Prenatal Factors?
The father's handedness, but not the mother’s, was significantly related to the child's hand preference and the percentage of left-handed children was significantly larger when the father was non-right-handed compared to right-handed, and tended to be larger among children in non-left-cephalic presentation compared to left-headedness.
Right-handed one day, right-handed the next day?
The results of this study indicate that testing handedness at that age gives fairly reliable results in terms of direction of hand preference, but less so in Terms of degree.
Does the Experimenter's Handedness Influence an Infant's Hand Preference for Grasping?
In this paper we investigated the effect of the experimenter’s handedness on infants’ choice of what hand to use in a handedness test. We divided forty-eight 12- month-old infants into four groups,
Who’s Left in the Family?
Left-handers are often classified by the presence or absence of other left-handers in their families. Familial (FS+) versus non-familial sinistrality (FS−) may indicate differences in the degree to
Handedness in man: The energy availability hypothesis.
This hypothesis if correct not only closes the gap in understanding human handedness and lateralization but also opens a vista for new research to focus on in utero tissue energy availability and its impact on outcome in life.
The developmental origins of laterality: fetal handedness.
  • P. Hepper
  • Psychology, Medicine
    Developmental psychobiology
  • 2013
The paper concludes that the initial developmental emergence of lateralized behavior is under genetic control and is a fundamental feature of prenatal human development and correlates with more efficient information processing as assessed by habituation.
Behavioral development of infant holding and its laterality in relation to mothers' handedness and child-care attitude.
The holding of 465 Japanese infants by their mothers was longitudinally observed at 4 and 9 months with several checkups and questionnaires of physical and psychological development and child-care attitude in a larger longitudinal study of mother-child relationships to discuss the meaning and possible determinants of holding laterality.
Early Lateralization of Gestures in Autism: Right-Handed Points Predict Expressive Language
Right-handed deictic gestures predicted expressive vocabulary 1 year later in both children with ASD and with TD, and may be an important indicator of language development in autism and typical development.


Handedness in the human fetus
The findings indicate that handedness is present prior to birth and the implications of this for the development of laterality are discussed.
Development of lateralized behaviour in the human fetus from 12 to 27 weeks’gestation
Handedness is the most prominent manifestation of behavioural lateralization in the human population. However, little is known about its ontogeny. This study examined the prenatal development of
Fetal handedness and head position preference: a developmental study.
There was no evidence to support the suggestion that hand contact and head position codevelop to form a preferred ipsilateral synergy, and neither type of contact established a stable relationship with head position.
A general theory concerning the prenatal origins of cerebral lateralization in humans.
The origins of cerebral lateralization in humans are traced to the asymmetric prenatal development of the ear and labyrinth, whereas the failure to develop clear vestibular asymmetry may underlie the poor motoric lateralization found in several neurodevelopmental disorders.
Prenatal head position from 12-38 weeks. I. Developmental aspects.
Fetal head position relative to the fetal body was studied longitudinally in 10 uncomplicated pregnancies by means of real-time ultrasound, finding a clear lateralized head position with the head being held mainly to the right.
Prenatal evidence of left-right asymmetries in auditory evoked responses using fetal magnetoencephalography.
Auditory evoked responses between right- and left-hemispheric derivations were investigated and the side-different latency development of the component P2pm suggests an earlier maturation of certain right than homologous left hemispheric brain areas during fetal brain development.
Lateral preferences and human behavior
1. Human Sidedness.- 2. Measurement.- Proficiency and Preference.- Hand Preference.- Foot Preference.- Eye Preference.- Ear Preference.- Quantification of Lateral Preference Behaviors.- 3. Population
Right hand, left hand: The origins of asymmetry in brains, bodies, atoms and cultures
List of Figures List of Tables Preface Acknowledgements 1. Dr Watson's problem 2. Death and the right hand 3. On the left bank 4. Kleiz, drept, luft, zeso, lijevi, prawy 5. The heart of the dragon 6.