S A Counter

Summary

Affiliation: Harvard University
Country: USA

Publications

  1. doi request reprint Brainstem auditory evoked responses in children living at high altitude in the andes mountains
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    High Alt Med Biol 14:155-61. 2013
  2. pmc Association of hemoglobin levels and brainstem auditory evoked responses in lead-exposed children
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 45:1197-201. 2012
  3. ncbi request reprint Neurocognitive impairment in lead-exposed children of Andean lead-glazing workers
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    J Occup Environ Med 47:306-12. 2005
  4. ncbi request reprint Mercury levels in urine and hair of children in an Andean gold-mining settlement
    S Allen Counter
    Department of Neurology, Harvard Medical School, The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138, USA
    Int J Occup Environ Health 11:132-7. 2005
  5. ncbi request reprint Neurocognitive screening of mercury-exposed children of Andean gold miners
    S Allen Counter
    Department of Neurology, Harvard Medical School, The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    Int J Occup Environ Health 12:209-14. 2006
  6. ncbi request reprint Lead concentrations in maternal blood and breast milk and pediatric blood of Andean villagers: 2006 follow-up investigation
    S Allen Counter
    Department of Neurology Dr Counter, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    J Occup Environ Med 49:302-9. 2007
  7. ncbi request reprint Brainstem mediation of the stapedius muscle reflex in hydranencephaly
    S Allen Counter
    Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, USA
    Acta Otolaryngol 127:498-504. 2007
  8. ncbi request reprint Comparative analysis of zinc protoporphyrin and blood lead levels in lead-exposed Andean children
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 40:787-92. 2007
  9. ncbi request reprint Preservation of brainstem neurophysiological function in hydranencephaly
    S A Counter
    Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, United States
    J Neurol Sci 263:198-207. 2007
  10. ncbi request reprint Zinc protoporphyrin levels, blood lead levels and neurocognitive deficits in Andean children with chronic lead exposure
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 41:41-7. 2008

Detail Information

Publications30

  1. doi request reprint Brainstem auditory evoked responses in children living at high altitude in the andes mountains
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    High Alt Med Biol 14:155-61. 2013
    ..s...
  2. pmc Association of hemoglobin levels and brainstem auditory evoked responses in lead-exposed children
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 45:1197-201. 2012
    ..Lead (Pb) exposure has also been associated with anemia and aberrant BAER. This study investigated the relationship between HbB level and BAER wave latency and amplitude in Pb-exposed Andean children...
  3. ncbi request reprint Neurocognitive impairment in lead-exposed children of Andean lead-glazing workers
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    J Occup Environ Med 47:306-12. 2005
    ..The objective of this study was to assess the effects of PbB concentration on nonverbal intelligence in Andean children with chronic environmental Pb exposure using a nonlanguage-based test of cognitive functioning...
  4. ncbi request reprint Mercury levels in urine and hair of children in an Andean gold-mining settlement
    S Allen Counter
    Department of Neurology, Harvard Medical School, The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138, USA
    Int J Occup Environ Health 11:132-7. 2005
    ..The wide range of Hg levels in the urine and hair of Andean children of gold miners may place them at risk for neurodevelopmental and learning disorders...
  5. ncbi request reprint Neurocognitive screening of mercury-exposed children of Andean gold miners
    S Allen Counter
    Department of Neurology, Harvard Medical School, The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    Int J Occup Environ Health 12:209-14. 2006
    ..16; p = < 0.034). These results suggest that a substantial number of Hg-exposed children in the Nambija study area have neurocognitive deficits in visual-spatial reasoning...
  6. ncbi request reprint Lead concentrations in maternal blood and breast milk and pediatric blood of Andean villagers: 2006 follow-up investigation
    S Allen Counter
    Department of Neurology Dr Counter, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    J Occup Environ Med 49:302-9. 2007
    ..To determine the current lead (Pb) concentration in blood (PbB) and breast milk (PbM) of mothers and the PbB of children living in Andean Ecuadorian villages with high Pb contamination...
  7. ncbi request reprint Brainstem mediation of the stapedius muscle reflex in hydranencephaly
    S Allen Counter
    Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, USA
    Acta Otolaryngol 127:498-504. 2007
    ....
  8. ncbi request reprint Comparative analysis of zinc protoporphyrin and blood lead levels in lead-exposed Andean children
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 40:787-92. 2007
    ..The objective of this study was to investigate the zinc protoporphyrin/heme ratio (ZPP/heme) as a biomarker for chronic lead (Pb) poisoning in children with a history of high Pb exposure...
  9. ncbi request reprint Preservation of brainstem neurophysiological function in hydranencephaly
    S A Counter
    Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, United States
    J Neurol Sci 263:198-207. 2007
    ....
  10. ncbi request reprint Zinc protoporphyrin levels, blood lead levels and neurocognitive deficits in Andean children with chronic lead exposure
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    Clin Biochem 41:41-7. 2008
    ..To investigate the relationship between blood lead (PbB), zinc protoporphyrin (ZPP) levels and performance on a test of auditory memory in Andean children and adolescents with chronic lead (Pb) exposure...
  11. doi request reprint Neurocognitive screening of lead-exposed andean adolescents and young adults
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, Massachusetts, USA
    J Toxicol Environ Health A 72:625-32. 2009
    ..In conclusion, both the RCPM and Digit Span tests were found to be effective instruments for field screening of visual-spatial reasoning and auditory memory abilities, respectively, in Pb-exposed Andean adolescents and young adults...
  12. doi request reprint Neurophysiologic and neurocognitive case profiles of Andean patients with chronic environmental lead poisoning
    S Allen Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, Massachusetts, USA
    J Toxicol Environ Health A 72:1150-9. 2009
    ....
  13. pmc Assessment of auditory brainstem function in lead-exposed children using stapedius muscle reflexes
    S A Counter
    Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
    J Neurol Sci 306:29-37. 2011
    ....
  14. pmc Acoustic stapedius muscle reflex in mercury-exposed Andean children and adults
    S Allen Counter
    Department of Neurology, Harvard Medical School Harvard Biological Laboratories, Cambridge, MA 02138, USA
    Acta Otolaryngol 132:51-63. 2012
    ..The results suggested mercury (Hg)-induced anomalies in the brainstem-mediated acoustic stapedius muscle reflex in children...
  15. ncbi request reprint Current pediatric and maternal lead levels in blood and breast milk in Andean inhabitants of a lead-glazing enclave
    S Allen Counter
    Department of Neurology, Harvard Medical School, Cambridge, MA 02138, USA
    J Occup Environ Med 46:967-73. 2004
    ..9-33.5 microg/dL for infants. The results showed significantly reduced PbB levels in children in the study area and suggest that a Pb education and prevention program contributed to the current reduction in Pb intoxication...
  16. ncbi request reprint Neurocognitive effects of chronic lead intoxication in Andean children
    S A Counter
    Department of Neurology Biological Laboratories, Harvard University, Cambridge, MA 02138, USA
    J Neurol Sci 160:47-53. 1998
    ..The results demonstrate a range of neurological responses in children with chronically elevated PbB levels from apparent exceptional neuro-physiological tolerance of PbB intoxication, to some fine motor and cognitive deficits...
  17. ncbi request reprint Blood lead and hemoglobin levels in Andean children with chronic lead intoxication
    S A Counter
    Department of Neurology Biological Laboratories, Harvard University, Cambridge, MA 02138, USA
    Neurotoxicology 21:301-8. 2000
    ..In conclusion, the results of this investigation indicate that the children in this Pb-contaminated, high altitude study area had chronic elevated PbB levels, which increased with age for males, and probable Pb-induced anemia...
  18. ncbi request reprint Environmental lead contamination and pediatric lead intoxication in an Andean Ecuadorian village
    S A Counter
    Harvard University, The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    Int J Occup Environ Health 6:169-76. 2000
    ..0001). The Pb levels in milk from breastfeeding mothers ranged from 1.44 to 39 ng/g. Lead isotope ratios of the children's blood and of samples of village soil revealed a common Pb source or "fingerprint."..
  19. ncbi request reprint Analysis of magnetic resonance imaging acoustic noise generated by a 4.7 T experimental system
    S A Counter
    Department of Neurology, Harvard University Biological Laboratories, Cambridge, Massachusetts 01238, USA
    Acta Otolaryngol 120:739-43. 2000
    ..The intense MRI acoustic impulse noise generated by the 4.7 T system may cause masking of stimuli used in fMRI of the auditory cortex, reduce the hearing acuity of experimental animals and present a risk for unprotected human ears...
  20. ncbi request reprint Gender differences in blood lead and hemoglobin levels in Andean adults with chronic lead exposure
    S A Counter
    Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Cambridge 02138, USA
    Int J Occup Environ Health 7:113-8. 2001
    ..7 microg/dL) in the reference group was significant (t-test, p = 0.026; Mann-Whitney U, p = 0.019). The mean altitude-corrected hemoglobin levels in the study group were lower than normal, 11.3 g/dL for men and 10.9 g/dL for women...
  21. ncbi request reprint Neuro-ototoxicity in andean adults with chronic lead and noise exposure
    S Allen Counter
    Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    J Occup Environ Med 44:30-8. 2002
    ..The results suggest that environmental noise exposure must be considered an important factor in determining sensory-neural hearing status in occupationally Pb-exposed adults...
  22. ncbi request reprint Elevated blood mercury and neuro-otological observations in children of the Ecuadorian gold mines
    S Allen Counter
    Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Cambridge, USA
    J Toxicol Environ Health A 65:149-63. 2002
    ..The children of Portovelo who reported neuro-otological symptoms but had low B-Hg levels (<10 microg/L) may be affected by exposure to sodium cyanide, which is used extensively in the local gold-mining operations...
  23. ncbi request reprint Brainstem neural conduction biomarkers in lead-exposed children of Andean lead-glaze workers
    S Allen Counter
    Department of Neurology, Harvard Medical School, Cambridge, Massachusetts 02138, USA
    J Occup Environ Med 44:855-64. 2002
    ..The findings also demonstrate the variability in the threshold level and duration of Pb exposure necessary to induce brainstem neuropathology...
  24. ncbi request reprint Neurophysiological anomalies in brainstem responses of mercury-exposed children of Andean gold miners
    S Allen Counter
    Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Harvard Biological Laboratories, Cambridge, Massachusetts 02138, USA
    J Occup Environ Med 45:87-95. 2003
    ....
  25. ncbi request reprint Succimer (meso-2,3-dimercaptosuccinic acid (DMSA)) treatment of Andean children with environmental lead exposure
    S Allen Counter
    Department of Neurology, Harvard Medical School, Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA
    Int J Occup Environ Health 9:164-8. 2003
    ....
  26. ncbi request reprint 3D MRI of the in vivo vestibulo-cochlea labyrinth during Gd-DTPA-BMA uptake
    S Allen Counter
    Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard University Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
    Neuroreport 14:1707-12. 2003
    ..The findings demonstrate that Gd-enhanced 3D MRI of the perilymphatic space may be used to examine the morphology, kinetics and intravenous substance delivery in the in vivo mammalian vestibulo-cochlea labyrinth...
  27. ncbi request reprint Mercury exposure in children: a review
    S Allen Counter
    Department of Neurology, Massachusetts General Hospital, Harvard Biological Laboratories, Harvard Medical School, Cambridge, MA 02138, USA
    Toxicol Appl Pharmacol 198:209-30. 2004
    ..Each source of Hg exposure is reviewed in relation to specific pediatric health effects, particularly subtle neurodevelopmental disorders...
  28. ncbi request reprint In vivo observation of dynamic perilymph formation using 4.7 T MRI with gadolinium as a tracer
    Jing Zou
    Department of Otolaryngology, Tampere University Hospital, Tampere, Finland
    Acta Otolaryngol 123:910-5. 2003
    ..To investigate the pharmacokinetics of gadolinium in the perilymphatic fluid spaces of the cochlea in vivo using high-resolution MRI to obtain information concerning perilymph formation...
  29. ncbi request reprint Imaging of the guinea pig cochlea following round window gadolinium application
    Maoli Duan
    Center for Hearing and Communication Research, Department of Otolaryngology, Karolinska Institutet, 171 76 Stockholm, Sweden
    Neuroreport 15:1927-30. 2004
    ..Auditory brainstem response measurements performed on a separate group of animals showed no significant threshold shifts after the application, indicating that gadolinium is non-toxic to the guinea pig cochlea...
  30. ncbi request reprint Dose and time-dependent protection of the antioxidant N-L-acetylcysteine against impulse noise trauma
    Maoli Duan
    Center for Hearing and Communication Research, Building M1, Karolinska Hospital, SE 171 76 Stockholm, Sweden
    Hear Res 192:1-9. 2004
    ..Hair cell loss was significantly reduced using a schedule of three NAC injections in the rats. These results suggest that NAC can partially protect the cochlea against impulse noise trauma...