The long term objectives of this project are to establish the recognition potential (RP) as a valid tool for studying perception and to use it to generate and test new ideas about the underlying processes. The proposed research will test three principles: The first is that the RP requires the conscious awareness of a recognizable image. Superimposed images will be presented. A subject will attend to one type, ignoring the other. A recognizable image that ordinarily evokes the RP should not do so if it goes unnoticed. The second principle is that RP latency reflects the speed of perception. This principle will be investigated in three paradigms in which speed of perception will be varied by priming, by using images that vary in the speed of identification, and by studying individual differences in subjects varying in their reading ability. The third principle is that RP amplitude depends on the magnitude of the attended visual area that is involved in processing of the recognizable images. This principle is suggested by source density analyses of the RP which have indicated that it is produced in a circumscribed patch of visual cortex. The principle will be investigated in two experiments in which the size of the area containing the recognizable images will be presented, and in which attention will be directed to small or large images imbedded within composite figures. It is anticipated that the results will provide additional valuable information regarding the character of the RP and will contribute to a fuller understanding of perception.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS029340-06
Application #
2750847
Study Section
Biopsychology Study Section (BPO)
Program Officer
Edwards, Emmeline
Project Start
1992-01-01
Project End
2002-07-31
Budget Start
1998-08-01
Budget End
2002-07-31
Support Year
6
Fiscal Year
1998
Total Cost
Indirect Cost
Name
Suny Downstate Medical Center
Department
Physiology
Type
Schools of Medicine
DUNS #
068552207
City
Brooklyn
State
NY
Country
United States
Zip Code
11203
Rudell, Alan P; Hu, Bin (2010) Effects of long-time reading experience on reaction time and the recognition potential. Int J Psychophysiol 76:158-68
Rudell, A P; Hu, B (2001) Does a warning signal accelerate the processing of sensory information? Evidence from recognition potential responses to high and low frequency words. Int J Psychophysiol 41:31-42
Rudell, A P; Hu, B (2000) Behavioral and brain wave evidence for automatic processing of orthographically regular letter strings. Brain Lang 75:137-52
Rudell, A P; Hu, B; Prasad, S et al. (2000) The recognition potential and reversed letters. Int J Neurosci 101:109-32
Rudell, A P; Hu, B (1999) Effects of target area and letter complexity on event-related potentials and reaction time. Int J Neurosci 99:159-80
Rudell, A P (1999) The recognition potential and the word frequency effect at a high rate of word presentation. Brain Res Cogn Brain Res 8:173-5
Rudell, A P; Hua, J (1997) The recognition potential, word difficulty, and individual reading ability: on using event-related potentials to study perception. J Exp Psychol Hum Percept Perform 23:1170-95
Rudell, A P; Hua, J (1996) The recognition potential and word priming. Int J Neurosci 87:225-40
Rudell, A P; Hua, J (1996) The recognition potential and conscious awareness. Electroencephalogr Clin Neurophysiol 98:309-18
Rudell, A P; Hua, J (1995) Recognition potential latency and word image degradation. Brain Lang 51:229-41

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