Spatial frequency tuning of facilitation by masks

H.D. Speed, John Ross

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The spatial frequency tuning of facilitation by masks is derived for a 2 c/deg test grating, counterphased at 8.8 Hz, from the contrasts at which masks of different spatial frequencies facilitate maximally. This tuning function has a bandwidth at half height of roughly 1.5 octaves, much broader than has been estimated previously from tuning functions determined at a constant contrast for each mask. We show also that best facilitation more than doubles sensitivity for tests of 4 c/deg and below, and that the magnitude of the facilitation effect declines at higher spatial frequencies.
Original languageEnglish
Pages (from-to)1143-1148
JournalVision Research
Publication statusPublished - 1992


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