The initial torsional Ocular Following Response (tOFR) in humans: a response to the total motion energy in the stimulus?

ABSTRACT: We recorded the initial torsional Ocular Following Responses (tOFRs) elicited at short latency by visual images that occupied the frontal plane and rotated about the lines of sight. Using 1-D radial gratings, the local spatio-temporal characteristics of these tOFRs closely resembled those we previously reported for the hOFRs to horizontal motion with 1-D vertical gratings. When the 1-D radial grating was subdivided into a number of concentric annuli, each with the same radial thickness, tOFRs were less than predicted from the sum of the responses to the individual annuli: spatial normalization. However, the normalization was much weaker than that which we previously reported for the hOFRs. Further, when the number, thickness and contrast of these concentric annuli were varied systematicall

SUBMITTER: Sheliga BM 

PROVIDER: S-EPMC3000739 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature