A Photographic Guide to Birds of Southern Africa by Ian Sinclair

By Ian Sinclair

Характеризует 750 видов южноафриканских птиц, включая не только резидентные и размножающиеся, но и большинство мигрантов. Фотографии, многие их которых демонстрируют птиц в полете, иллюстрируют разнообразие форм и раскрасок.
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The two central motoneurons innervate the same number of muscle fibers on the two sides. The tonic frequency of all these pairs of homologues is also asymmetrical, but all three pairs show a higher frequency on the left side. ) During reflex stimulation of the motoneurons a transient decrease in this asymmetry can be observed, for example in the medial motoneurons of Figure 4. The inhibitors ' also fire, but at a higher frequency on the right side; they are not rigidly coupled as they are in crayfish (Evoy, Kennedy, & Wilson, 1967) and lobster (Otsuka, Kravitz, & Potter, 1967) (Figure 5C).

Nelsen et al. (Chapter 23) have examined EEG laterality in the parietal region of the cortex in rabbits under a variety of conditions. In the normal, relaxed waking state the EEG amplitude is lower over one hemisphere than the other - lower amplitude indicates greater activation - although which side is lower varies from rabbit to rabbit. When the rabbit falls into deep sleep (either normal or pentobarbitol^-induced) overall amplitude rises and there is a reversal of the waking amplitude laterality relationship, with the formerly lower side now relatively higher.

But this too could have been due to task difficulty; and there were no CNV differences between form and function matches. Principal Components Analysis of the quantified CNV waveform yielded several factors, of which one displayed right-left asymmetries and another anterior-posterior differences. ), no strong conclusions concerning the hemispheric lateralization of form and function matching in normal intact man can be drawn. xxxvni INTRODUCTORY OVERVIEW ASYMMETRIES DURING HAND-USE AND SPATIAL IN MONKEYS DELAYED RESPONDING Remarkably enough, similar experiments with monkeys do give clear evidence of hemispheric lateralization and, significantly, the effects are observed in spatial tasks, and may be mediated by orientation bias (see Parts IV and V and above).

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