Response vs. temporal frequency of drifting sinusoidal gratings for V1 complex direction selective cells
Center for Neural Science
New York University
4 Washington Place, Room 809
New York, NY 10003

Support: Howard Hughes Medical Institute

ANIMAL Macaca fascicularis
PREP anesthetized (sufentanil), paralyzed (vecuronium)
DATA TYPE extracellular spike times
CELL TYPE complex, direction selective
N 45 cells


The stimulus was a drifting sinusoidal grating at 100% contrast presented in a circular aperture that covered a region larger than the classical center and surround of each cell. Spatial frequency was fixed at the optimal value. Temporal frequency (TF) was varied from trial to trial from 0.2 to 25 Hz in octave steps. For trials with the parameter ampl set to zero, no stimulus appeared and the response represents the spontaneous firing to a mean gray field. During data collection, the non-dominant eye was occluded with a black, non-reflective surface.

The units of temporal frequency, tf, are 10.24 times cycles/sec, e.g. tf 128 is 12.5 Hz. The variable cycles specifies the number of cycles that the grating drifted on each trial, and is typically related to tf.

Electrophysiological Methods

Bair W, Movshon JA (2004) Adaptive Temporal Integration of Motion\\ in Direction Selective Neurons in Macaque Visual Cortex. J Neurosci 24:7305--7323.

Published analyses of these responses