By J. M. Bruce

12 pages together with covers, uncomplicated and particular info at the airplane and its carrier with bw and colour illustrations

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Extra resources for Aircraft Profile No. 21: The Bristol Fighter

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31. Propagation of Normalized Disinhibitory Cues Just as in feedforward networks, the feedback normalization property is weakened if the inhibitory path strengths are chosen to decrease more rapidly with distance. Then the normalization property tends to hold among subsets of cells that lie within one band­ width of the network's inhibitory structural scale. In particular, if some cell activities are enhanced by a given amount, then their neighbors will tend to be suppressed by a comparable amount.

The peaks of higher spatial frequency functional scales can overlay the 45 46 Chapter 1 spaces between lower spatial frequency functional scales. Retinal tremor and other eye movements can randomize the spatial phases of, and thereby spatially smooth, the higher frequency scales across the lower frequency scales through time. Even within a single structural scale, if the b o u n d a r y of an input p a t t e r n curves in two dimensions, then the disinhibitory wavelets can cause interference p a t t e r n s as they propagate into the interior of the activity p a t t e r n along rays perpendicular to each b o u n d a r y element.

A metric makes local matches between corresponding input intensities, whereas a network matches reflectances, which depend upon the entire pattern. One could of course use a metric to match ratios of input intensities, but this computation requires an extra homuncular processing step and is insensitive to overall input intensity, which is not true of the network matching mechanism. When the 28 Chapter 1 long-range inhibitory term Y^k^t h m (1) is replaced by distance-dependent inhibitory interactions, as in equation (22) of Section 24, a global match of patterns is replaced by simultaneous local matches on a spatial scale that varies monotonically with receptive field size.

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Aircraft Profile No. 21: The Bristol Fighter by J. M. Bruce

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