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Neuron, Vol. 32, 185201, October 25, 2001, Copyright 2001 by Cell Press ReviewFiguring Space by Time
 

Summary: Neuron, Vol. 32, 185201, October 25, 2001, Copyright 2001 by Cell Press
ReviewFiguring Space by Time
cial pad of the rat contains about 35 large whiskers,Ehud Ahissar1
and Amos Arieli
which are arranged in five rows and about seven arcsDepartment of Neurobiology
(columns) (Figure 1). To obtain sensory information, suchThe Weizmann Institute of Science
as the location and texture of external objects (Gustaf-Rehovot 76100
son and Felbain-Keramidas, 1977; Simons, 1995), theIsrael
whiskers move back and forth with a rhythmic motion
("whisking") at 410 Hz (Carvell and Simons, 1990;
Fanselow and Nicolelis, 1999; Kleinfeld et al., 1999;
Welker, 1964), covering several cubic centimeters nearSensory information is encoded both in space and
the snout (Brecht et al., 1997; Wineski, 1983). Eachin time. Spatial encoding is based on the identity of
whisker along the same arc scans a different trajectory,activated receptors, while temporal encoding is based
while all the whiskers of the same row scan roughly theon the timing of activation. In order to generate accu-
same trajectory (Brecht et al., 1997). The vertical locationrate internal representations of the external world, the
of a punctuate object can be extracted from the identitybrain must decode both types of encoded information,
of activated whiskers along each arc. We use the termeven when processing stationary stimuli. We review
"spatial coding" to refer to this kind of coding, which ishereevidence in supportofaparallel processing scheme
based on the spatial profile of whisker activation. Thefor spatially and temporally encoded information in

  

Source: Ahissar, Ehud - Department of Neurobiology, Weizmann Institute of Science

 

Collections: Biology and Medicine