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Julio C. Martinez-Trujillo - Associate Professor

Julio C. Martinez-Trujillo

Department of Physiology
McGill University
McIntyre Medical Sciences Building,
Room 1223
3655 Promenade Sir William Osler
Montréal, Québec H3G 1Y6

Tel: (514) 398-6024
Fax: (514) 398-8241

julio [dot] martinez [at] mcgill [dot] ca (julio.martinez)julio [dot] martinez [at] mcgill [dot] ca (@mcgill.ca)

Laboratory web site:

Lab positions available

Research Area:  Neurophysiology and Cognitive Neurosciences

Research Description:

My research aims at understanding the physiology of cognition and behavior. My laboratory focuses on investigating how the brain transforms visual signals into coordinated motor behavior and how this process is influenced by attention. We use a combination of techniques (electrophysiology, behavioral measurements and brain imaging) in normal subjects and patients. We measure electrical activity in different brain regions and eye movements during visuomotor tasks while manipulating the behavioral relevance of the different task components. The results of our research will contribute to understand how the brain generates behavior and may contribute to the understanding of neurological and psychiatric disorders in humans.

Education:  MD (Havana University, Cuba), Ph.D. (University of Tuebingen, Germany), Postdoctoral training (York University, Canada)

Recent Publications:

Lennert T, Martinez-Trujillo JC.
Strength of response suppression to distracter stimuli determines the speed and accuracy of attentional filtering by prefrontal neurons. Neuron (in press).

Mendoza D, Schneiderman M, Kaul C, Martinez-Trujillo JC.
Working memory and feature-based attention simultaneously modulate the perception of visual motion direction. Journal of Vision 11(1):11, 2011.

Niebergall R, Huang L, Martinez-Trujillo JC.
Similar perceptual costs for dividing attention between retina- and space-centered targets in humans. Journal of Vision 10(12):4, 2010.

Khayat P, Niebergall R, Martinez-Trujillo JC.
Frequency-dependent attentional modulation od local field potential signals in macaque area MT. The Journal of Neuroscience 30(20):7037-48, 2010.

Khayat P, Niebergall R, Martinez-Trujillo JC.
Attention differentially modulates similar neuronal responses in area MT evoked by varying contrast and direction stimuli. The Journal of Neuroscience 30(6):2188-97, 2010.

Martinez-Trujillo JC, Cheyne D, Gaetz W, Simine E, Tsotsos JK.
Activation of Area MT/V5 and the Right Inferior Parietal Cortex during the Discrimination of Transient Direction Changes in Translational Motion. Cerebral Cortex 17(7): 1733-39, 2007.

Martinez-Trujillo JC, Medendorp WP, Wang H, Crawford JD.
Frames of reference for eye-head gaze commands in primate Supplementary Eye Fields. Neuron, 44(6):1057-66, 2004.

Martínez-Trujillo JC, Treue S.
Feature-based attention increases the selectivity of population responses in primate visual cortex. Current Biology 14 (9):744-751, 2004 .

Martínez-Trujillo JC, Treue S.
Attention changes apparent stimulus contrast in primate visual cortex. Neuron, 35: 365-370, 2002.

Treue S, Martínez-Trujillo JC.
Feature-based attention influences motion processing gain in macaque visual cortex. Nature, 399, 575-579, 1999.