Publications

Speeding up reaction time with invisible stimuli  (2002)

Authors:
SAVAZZI S.; MARZI C.A.
Title:
Speeding up reaction time with invisible stimuli
Year:
2002
Type of item:
Articolo in Rivista
Tipologia ANVUR:
Articolo su rivista
Language:
Inglese
Format:
A Stampa
Referee:
Name of journal:
Current Biology
ISSN of journal:
0960-9822
N° Volume:
12
Number or Folder:
5
:
Cell Press
Page numbers:
403-407
Short description of contents:
Normal subjects react more quickly to a pair of visual stimuli than to a stimulus alone. This phenomenon is known as the redundant signal effect (RSE) and represents an example of divided visual attention in which signal processing is carried out in parallel to the advantage of response speed. A most interesting aspect of this phenomenon is that it can occur when one stimulus in a pair cannot be consciously detected because of hemianopia or unilateral extinction resulting from brain damage. Here, we report that a similar dissociation between visual awareness and visually guided behavior is present in normal subjects who show an RSE even when the luminance of one of a pair of stimuli is below detection threshold. The observed RSE cannot be attributed to probability summation because it violates Miller's race inequality and is likely to be related to neural summation between supra- and subthreshold stimuli. Given that a similar implicit RSE is present in hemispherectomy patients, we hypothesize that the site of this summation might be the superior colliculus (SC).
Web page:
doi:10.1016/S0960-9822(02)00688-7
Product ID:
418
Handle IRIS:
11562/301639
Deposited On:
July 24, 2007
Last Modified:
June 30, 2020
Bibliographic citation:
SAVAZZI S.; MARZI C.A., Speeding up reaction time with invisible stimuli «Current Biology» , vol. 12 , n. 52002pp. 403-407

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