Individual Listing

2123 PSYCHOLOGY BUILDING
University of California
Riverside, CA 92521

Abdulrazak, Khaleel

Assistant Professor

College of Humanities, Arts, and Social Sciences

Psychology


Biography

I am interested in the development of sensory systems. The main focus of my current research is the development of neural selectivity for vocalizations in the auditory cortex of the pallid bat. I believe that these studies will reveal principles applicable to vocalization processing in general, including human speech. I will also start investigating ultrasonic call processing in normal and transgenic mice to better understand the interactions between genes and the environment in brain development. Another line of research I am interested in is the capacity for humans to process multiple sounds within a short time interval. The main techniques used in my lab are single and multi-electrode electrophysiology, neuropharmacology, tract tracing and behavioral analysis.

Research Area

The development of sensory processing. The development of both sound localization and echolocation behaviors in the pallid bat.

Publications

Razak KA and Pallas SL (2007) Inhibitory plasticity facilitates recovery of stimulus velocity tuning in the superior colliculus after chronic NMDA receptor blockade. Journal of Neuroscience 27: 7275-7283.

Razak KA and Fuzessery ZM (2007) Development of inhibitory mechanisms underlying selectivity for the rate and direction of frequency-modulated sweeps in the auditory cortex. Journal of Neuroscience 27:1769-1781.

Razak KA and Fuzessery ZM (2007) Development of functional organization of the pallid bat auditory cortex. Hearing Research 228:69-81.

Razak KA, Shen W, Zumsteg, T and Fuzessery, ZM (2006) Parallel thalamocortical pathways for echolocation and passive sound localization in a gleaning bat, Antrozous pallidus. Journal of Comparative Neurology 500:322-338, 2006.

Razak KA and Pallas SL. Dark rearing reveals the mechanism underlying stimulus size tuning of superior colliculus neurons. Visual Neuroscience 23:741-748, 2006.

Razak KA and Fuzessery ZM (2006) Neural mechanisms underlying selectivity for the rate and direction of frequency-modulated sweeps in the auditory cortex of the pallid bat. Journal of Neurophysiology 96:1303–1319.

Razak, KA and Pallas SL (2005) Neural mechanisms of stimulus velocity tuning in the superior colliculus. Journal of Neurophysiology 94:3573–3589.

Razak KA, Huang L and Pallas SL (2003) Chronic NMDA receptor blockade increases receptive field size without affecting stimulus velocity or size tuning of superior colliculus neurons. Journal of Neurophysiology 90: 110-119.

Barber JR, Razak KA and Fuzessery ZM (2003) Can two streams of auditory information be processed simultaneously? Evidence from the gleaning bat Antrozous pallidus. Journal of Comparative Physiology A 189: 843-855.