Skip to main content
. 2009 Aug 27;3:7. doi: 10.3389/neuro.06.007.2009

Figure 7.

Figure 7

Feedback, and SRP. (A) The mean ΔV(t)rel for all animals exposed to the bar moving downwards from the peripheral FOV. The ΔV(t)rel (see also Materials and Methods) gives the phase information of the ΔV(t) changes over cortex. A SRP is formed along the 19/21 border as a ΔV(t)rel increase moving as a feedback towards the bar representation in 17/18 and to a point at the 17/18 border approximately 6° ahead of the 17/18 bar representation. (B) The d(ΔV(t))/dt averaged across animals exposed to the bar moving down from the peripheral FOV. Note the d(ΔV(t))/dt increase (inward current) as a feedback moving from 19/21 to the 17/18 border forming an SRP targeting a point approximately 6° ahead of the 17/18 bar representation. (C) The SRP is spatially restricted to the cortical path of the bar. The bar path was calculated for all animals by following the moving peak of the ΔV(t)rel(s). The solid white line (inset) represents an individual example. The solid green line shows the mean ΔV(t) signal for all animals from areas 17/18 within the motion path (individual example, green oval, inset). The solid blue line shows the mean ΔV(t) for all animals from areas directly adjacent to the motion path (individual example, blue oval, inset). Error bars indicate SEM at the time of the peak of the SRP. (D) The mean ΔV(t)rel(s) for all animals taken at the time of the SRP at 10 equidistant points behind, (blue line) and in front (green line) of the bar representation. The 10 points were part of the cortical motion path at or very close to the 17/18 cytoarchitectural border. To calculate the activity occurring behind the motion path (blue line), we used the two conditions in which the bar moved from CFOV. To calculate the activity in front of the motion path (green line), we the two conditions in which the bar moved from the peripheral FOV, The ΔV(t)rel(s) signal behind the moving object decays monotonically with distance. The ΔV(t)rel(s) signal in front of the moving bar shows an increase at 0.96–1.28 mm ahead of the object representation (SRP).