Search Results - "WALKER, David L"

Phasic vs sustained fear in rats and humans: role of the extended amygdala in fear vs anxiety by Davis, Michael, Walker, David L, Miles, Leigh, Grillon, Christian

“…Data will be reviewed using the acoustic startle reflex in rats and humans based on our attempts to operationally define fear vs anxiety. Although the symptoms…”
Get full text

Role of the extended amygdala in short-duration versus sustained fear: a tribute to Dr. Lennart Heimer by Walker, David L., Davis, Michael

“…The concept of the “extended amygdala”, developed and explored by Lennart Heimer, Jose de Olmos, George Alheid, and their collaborators, has had an enormous…”
Get full text

Role of the bed nucleus of the stria terminalis versus the amygdala in fear, stress, and anxiety by Walker, David L, Toufexis, Donna J, Davis, Michael

“…The bed nucleus of the stria terminalis is a limbic forebrain structure that receives heavy projections from, among other areas, the basolateral amygdala, and…”
Get full text

Calcitonin gene-related peptide in the bed nucleus of the stria terminalis produces an anxiety-like pattern of behavior and increases neural activation in anxiety-related structures by Sink, Kelly S, Walker, David L, Yang, Yong, Davis, Michael

“…Calcitonin gene-related peptide (CGRP) evokes anxiety-like responses when infused into the lateral ventricle of rats. Because the bed nucleus of the stria…”
Get full text

Embryo Blastomere Exclusion Identified in a Time-Lapse Culture System Is Associated with Embryo Ploidy by Shenoy, Chandra C, Bader, Alexandra, Walker, David L, Fredrickson, Jolene R, Weaver, Amy L, Zhao, Yulian

“…This study examined blastomere exclusion which is seen during embryo development and could represent imperfect cell division or a mechanism of aneuploidy…”
Get more information

Amygdala Infusions of an NR2B-Selective or an NR2A-Preferring NMDA Receptor Antagonist Differentially Influence Fear Conditioning and Expression in the Fear-Potentiated Startle Test by Walker, David L, Davis, Michael

“…Within the amygdala, most N-methyl-D-aspartic acid (NMDA) receptors consist of NR1 subunits in combination with either NR2A or NR2B subunits. Because the…”
Get full text

The role of amygdala glutamate receptors in fear learning, fear-potentiated startle, and extinction by Walker, David L., Davis, Michael

“…Using a paradigm known as fear-potentiated startle, we have examined the neurobiological substrates of Pavlovian fear conditioning. In these experiments, rats…”
Get full text

Washing mineral oil reduces contaminants and embryotoxicity by Morbeck, Dean E., Ph.D, Khan, Zaraq, M.B.B.S, Barnidge, David R., Ph.D, Walker, David L., M.S

“…Objective To determine if washing improves the quality of mineral oil used for embryo culture. Design A 2 × 3 factorial experimental study. Setting University…”
Get full text

Double Dissociation between the Involvement of the Bed Nucleus of the Stria Terminalis and the Central Nucleus of the Amygdala in Startle Increases Produced by Conditioned versus Unconditioned Fear by Walker, David L, Davis, Michael

“…The amplitude of the acoustic startle response is reliably enhanced when elicited in the presence of bright light (light-enhanced startle) or in the presence…”
Get full text

Variability in protein quality used for embryo culture: embryotoxicity of the stabilizer octanoic acid by Leonard, Phoebe H., M.D, Charlesworth, M. Cristine, Ph.D, Benson, Linda, B.S, Walker, David L., M.Sc, Fredrickson, Jolene R., M.S, Morbeck, Dean E., Ph.D

“…Objective To screen human serum albumin (HSA) preparations for toxicity and investigate causes of variation. Design Experimental laboratory study. Setting…”
Get full text

Mouse strain and quality control testing: improved sensitivity of the mouse embryo assay with embryos from outbred mice by Khan, Zaraq, M.B.B.S, Wolff, Heather S., M.D, Fredrickson, Jolene R., M.S, Walker, David L., M.S, Daftary, Gaurang S., M.D, Morbeck, Dean E., Ph.D

“…Objective To determine the relative sensitivities of embryos from different strains of mice to in vitro stress. Design Laboratory experiment with embryos from…”
Get full text

Mitogen-Activated Protein Kinase Cascade in the Basolateral Nucleus of Amygdala Is Involved in Extinction of Fear-Potentiated Startle by Lu, Kwok-Tung, Walker, David L, Davis, Michael

“…Previous results indicate that intra-amygdala infusions of NMDA receptor antagonists block the extinction of conditioned fear. Mitogen-activated protein kinase…”
Get full text

Potential of inner cell mass outgrowth and amino acid turnover as markers of quality in the in vitro fertilization laboratory by Gada, Ravi P., M.D, Daftary, Gaurang S., M.D, Walker, David L., M.S, Lacey, Jean M., B.A, Matern, Dietrich, M.D., Ph.D, Morbeck, Dean E., Ph.D

“…Objective To compare sensitivity of inner cell mass (ICM) outgrowth assay and analysis of culture media amino acid turnover with the sensitivity of the human…”
Get full text

Post-viral olfactory dysfunction treated with acupuncture by Hunter, Jane EB, Phillips, M Elizabeth, Walker, F David L, Busby, Dawn

Get full text

Light-enhanced startle: further pharmacological and behavioral characterization by WALKER, David L, DAVIS, Michael

“…Previous findings indicate that the acoustic startle response is elevated when rats are tested in bright light. The phenomenon is disrupted by the 5HT1A…”
Get full text

Role of bed nucleus of the stria terminalis and amygdala AMPA receptors in the development and expression of context conditioning and sensitization of startle by prior shock by Davis, Michael, Walker, David L.

“…A core symptom of post-traumatic stress disorder is hyper-arousal—manifest in part by increases in the amplitude of the acoustic startle reflex. Gewirtz et al…”
Get full text

Comparison of live birth rates after IVF–embryo transfer with and without preimplantation genetic testing for aneuploidies by Sadecki, Emily, Rust, Laura, Walker, David L., Fredrickson, Jolene R., Krenik, Anthony, Kim, Tana, Weaver, Amy L., Zhao, Yulian

“…Does the use of preimplantation genetic testing for aneuploidies (PGT-A) result in higher live birth rates when compared with both fresh and frozen embryo…”
Get full text

Vitrification versus slow freezing of human ovarian tissue: a systematic review and meta-analysis of histological outcomes by Behl, Supriya, Joshi, Vidhu B., Larson, Nicholas B., Young, Maia C., Bilal, Muhammad, Walker, David L., Khan, Zaraq, Granberg, Candace F., Chattha, Asma, Zhao, Yulian

“…A systematic review and meta-analysis of pertinent literature published from 2006 to January 2022 were conducted to study and compare vitrification and slow…”
Get full text

Parthenogenic activation of surplus in vitro–matured human oocytes: a tool for validation of oocyte cryopreservation by Morbeck, Dean E., Ph.D, Walker, David L., M.Sc, Fredrickson, Jolene R., M.S, Barud, Kathrynne M., B.S, Coddington, Charles C., M.D

“…Controlled-rate frozen and vitrified mature human oocytes were thawed or warmed and parthenogenically activated using ionomycin and 6-dimethylaminopurine to…”
Get full text

Mechanisms underlying long-term fear memory formation from a metaplastic neuronal state by Parsons, Ryan G, Walker, David L, Davis, Michael

“…We previously showed that a single weak fear conditioning trial, that does not produce a long-term fear memory (LTM), appeared to prime memory formation such…”
Get full text