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Talgar, C.P., Pelli, D., &
Carrasco, M. (2004). Covert attention enhances letter identification without
affecting channel tuning. Journal of Vision, 4(1), 22-31, http://journalofvision.org/4/1/3/,
doi:10.1167/4.1.3.
Abstract
Directing covert attention to the target location enhances sensitivity,
but it is not clear how this enhancement comes about. Knowing that a single
spatial frequency channel mediates letter identification, we use the critical-band-masking
paradigm to investigate whether covert attention affects the spatial frequency
tuning of that channel. We find that directing attention to the target
location halves threshold energy without affecting the channel’s
spatial frequency tuning.
Keywords: covert attention, letter identification, spatial vision, critical-band
masking, spatial frequency channel
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