This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Microsaccades can elevate contrast detection thresholds of human observers and modulate the activity of neurons in monkey visual cortex. Whether microsaccades elevate contrast detection thresholds in monkey observers is not known and bears on the interpretation of neurophysiological experiments. To answer this question, we trained two monkeys to perform a 2AFC contrast detection task. Performance was worse on trials in which a microsaccade occurred during the stimulus presentation. The magnitude of the effect was modest (threshold changes of 0.2 log units) and color specific: achromatic sensitivity was impaired but red-green sensitivity was not. To explore the neural basis of this effect, we recorded the responses of individual V1 neurons to a white noise stimulus. Microsaccades produced a suppression of spiking activity followed by a excitatory rebound that was similar for L-M cone-opponent and L+M non-opponent V1 neurons. We conclude that microsaccades in the monkey increase luminance contrast detection thresholds and modulate the spiking activity of V1 neurons, but the luminance-specificity of the behavioral suppression is likely implemented downstream of V1.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Primate Research Center Grants (P51)
Project #
5P51RR000166-50
Application #
8357595
Study Section
Special Emphasis Panel (ZRR1-CM-8 (02))
Project Start
2011-05-01
Project End
2012-04-30
Budget Start
2011-05-01
Budget End
2012-04-30
Support Year
50
Fiscal Year
2011
Total Cost
$104,332
Indirect Cost
Name
University of Washington
Department
Veterinary Sciences
Type
Other Domestic Higher Education
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195
McAdams, Ryan M; McPherson, Ronald J; Kapur, Raj P et al. (2017) Focal Brain Injury Associated with a Model of Severe Hypoxic-Ischemic Encephalopathy in Nonhuman Primates. Dev Neurosci 39:107-123
Klegarth, Amy R; Ezeonwu, Chigozie A; Rompis, Aida et al. (2017) Survey of Treponemal Infections in Free-Ranging and Captive Macaques, 1999-2012. Emerg Infect Dis 23:816-819
Hallum, Luke E; Shooner, Christopher; Kumbhani, Romesh D et al. (2017) Altered Balance of Receptive Field Excitation and Suppression in Visual Cortex of Amblyopic Macaque Monkeys. J Neurosci 37:8216-8226
Seeman, Stephanie C; Mogen, Brian J; Fetz, Eberhard E et al. (2017) Paired Stimulation for Spike-Timing-Dependent Plasticity in Primate Sensorimotor Cortex. J Neurosci 37:1935-1949
Balakrishnan, Ashwini; Goodpaster, Tracy; Randolph-Habecker, Julie et al. (2017) Analysis of ROR1 Protein Expression in Human Cancer and Normal Tissues. Clin Cancer Res 23:3061-3071
Shooner, Christopher; Hallum, Luke E; Kumbhani, Romesh D et al. (2017) Asymmetric Dichoptic Masking in Visual Cortex of Amblyopic Macaque Monkeys. J Neurosci 37:8734-8741
Rembado, Irene; Zanos, Stavros; Fetz, Eberhard E (2017) Cycle-Triggered Cortical Stimulation during Slow Wave Sleep Facilitates Learning a BMI Task: A Case Report in a Non-Human Primate. Front Behav Neurosci 11:59
Richter, Maximilian; Yumul, Roma; Saydaminova, Kamola et al. (2016) Preclinical safety, pharmacokinetics, pharmacodynamics, and biodistribution studies with Ad35K++ protein: a novel rituximab cotherapeutic. Mol Ther Methods Clin Dev 5:16013
McLoon, Linda K; Christiansen, Stephen P; Ghose, Geoffrey M et al. (2016) Improvement of Eye Alignment in Adult Strabismic Monkeys by Sustained IGF-1 Treatment. Invest Ophthalmol Vis Sci 57:6070-6078
Liao, Hsi-Wen; Ren, Xiaozhi; Peterson, Beth B et al. (2016) Melanopsin-expressing ganglion cells on macaque and human retinas form two morphologically distinct populations. J Comp Neurol 524:2845-72

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