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Ezra Smith
University of Arizona
8Publications
5H-index
207Citations
Publications 8
Newest
Abstract Background Despite its designation as a ‘dissociative anaesthetic,' the dissociative and psychoactive effects of ketamine remain incompletely understood. The goal of this study was to characterise the subjective experiences and accompanying EEG changes with subanaesthetic doses of ketamine. Methods High-density EEG was recorded in 15 human volunteers before, during, and after subanaesthetic ketamine infusion (0.5 mg kg −1 over 40 min), with self-reported measures of altered states of co...
#1Ezra SmithH-Index: 5
#2James F. CavanaghH-Index: 12
Last.John J. B. AllenH-Index: 54
view all 3 authors...
Frontal EEG alpha asymmetry provides a promising index of depression risk, yet very little is known about the neural sources of alpha asymmetry. To identify these sources, this study examined alpha asymmetry using a distributed inverse solution: exact low resolution brain electromagnetic tomography (eLORETA). Findings implicated a generator in lateral midfrontal regions that contributed to both surface asymmetry and depression risk. Participants with any lifetime history of depressive episodes w...
#1Ezra Smith (UA: University of Arizona)H-Index: 5
#2Samantha J. Reznik (UA: University of Arizona)H-Index: 3
Last.John J. B. Allen (UA: University of Arizona)H-Index: 54
view all 4 authors...
Abstract Frontal electroencephalographic (EEG) alpha asymmetry is widely researched in studies of emotion, motivation, and psychopathology, yet it is a metric that has been quantified and analyzed using diverse procedures, and diversity in procedures muddles cross-study interpretation. The aim of this article is to provide an updated tutorial for EEG alpha asymmetry recording, processing, analysis, and interpretation, with an eye towards improving consistency of results across studies. First, a ...
#1Ezra Smith (UA: University of Arizona)H-Index: 5
#2Laura Zambrano-Vazquez (UA: University of Arizona)H-Index: 3
Last.John J. B. Allen (UA: University of Arizona)H-Index: 54
view all 3 authors...
Some authors have argued that worry cues lateralization of frontal brain activity leftward, whereas other varieties of avoidance motivation cue lateralization of frontal brain activity rightward. By comparison, more right-than-left parietal activity correlates with anxious arousal. The purpose of the present report was to test two models of brain lateralization and anxiety: one model that proposed that worry correlates with more left-frontal activity and another model that proposed that avoidanc...
#1Joseph L. Sanguinetti (UA: University of Arizona)H-Index: 6
#2Ezra Smith (UA: University of Arizona)H-Index: 5
Last.Stuart R. HameroffH-Index: 36
view all 4 authors...
#1Ezra Smith (UA: University of Arizona)H-Index: 5
#2Anna Weinberg (SBU: Stony Brook University)H-Index: 26
Last.Greg Hajcak (SBU: Stony Brook University)H-Index: 64
view all 4 authors...
Abstract Emotional faces are motivationally salient stimuli that automatically capture attention and rapidly potentiate neural processing. Because of their superior temporal resolution, scalp-recorded event-related potentials (ERPs) are ideal for examining rapid changes in neural activity. Some reports have found larger ERPs for fearful and angry faces compared with both neutral and other emotional faces, and a key aim of the present study was to assess neural response to multiple emotional expr...
#1Autumn Kujawa (SBU: Stony Brook University)H-Index: 19
#2Ezra Smith (UA: University of Arizona)H-Index: 5
Last.Greg Hajcak (SBU: Stony Brook University)H-Index: 64
view all 4 authors...
The feedback negativity (FN) has been shown to reflect the binary evaluation of possible outcomes in a context-dependent manner, but it is unclear whether context dependence is based on global or local alternatives. A cued gambling task was used to examine whether the FN is sensitive to possible outcomes on a given trial, or the range of outcomes across trials. On 50% of trials, participants could break even or lose money; on remaining trials, participants could win or break even. Breaking even ...
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