PubMed · 4671164
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R E Hooper. 1972. Electrocochleography.. https://pubmed.ncbi.nlm.nih.gov/4671164/
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The purpose of the present study was to assess the effect of a high-gluten diet against a gluten-free diet on learning stimulus-response relationships in rats. In the first phase of training rats learned to associate a stimulus light with responding on a particular response lever. In the second phase, the same rats were exposed to new, but redundant stimuli to guide responding (a tone and houselight). Probe trials, involving only new stimuli, revealed that rats fed a gluten-free diet displayed a "blocking" effect. That is, gluten-free rats did not learn to associate these new stimuli with particular responses. In contrast, high-gluten rats very quickly learned to use these redundant stimuli to guide responding. Subsequent phases of training demonstrated, however, that this group difference could be removed. The present findings are discussed in the context of the possible links between dietary gluten and schizophrenia.
The aim of the present study was to investigate whether the alteration in hypothalamic-pituitary-thyroid axis function results in electrodermal abnormality without causing marked psychiatric manifestations or not. Electrodermal activity was recorded with the skin conductance unit and IBM-AT computer. Basal levels of electrodermal activity (EDA), as well as responsivity to repeated insignificant acoustic stimulation were studied in 24 nonmedicated hyperthyroid patients and 35 healthy controls. The outcome of psychiatric rating scores indicated that patients had low anxiety scores and normal depression scores. The basal levels of thyroid hormones were higher in patients, when compared with the control group. On the analysis of EDA, we found lower onset latency and duration of the skin conductance response and higher skin conductance level in nonmedicated patients than healthy controls. The results above provide supporting evidence that the change of hypothalamic-pituitary-thyroid axis function results in abnormal EDA, without causing marked psychiatric manifestations.
This study attempted to replicate findings of abnormal auditory event-related potentials (ERPs) in posttraumatic stress disorder (PTSD) in a sample of Vietnam combat veterans. Veterans with combat-related PTSD, divided into unmedicated (unmed-PTSD, n = 12) and medicated (med-PTSD, n = 22) groups, and veterans without PTSD (non-PTSD, n = 10) completed a three-tone "oddball" target detection task while ERPs were measured. Individuals with comorbid panic disorder (PD) were excluded from the primary analyses. Parietal P3 amplitude to the target tone was significantly smaller in unmed-PTSD compared to med-PTSD and non-PTSD groups. These differences did not remain significant when an adjustment was made for level of depression. Parietal P3 amplitude was also negatively correlated with state anxiety. Secondary analyses within the unmed-PTSD group indicated that participants with comorbid PD (n = 3) had the largest parietal P3 amplitudes to target tones. Results are consistent with attentional or concentration deficits in PTSD and highlight the importance of considering comorbid diagnoses. The absence of ERP differences between med-PTSD and non-PTSD participants suggests that psychotropic medication may normalize these deficits.