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201.
202.
Involuntary eye movements were recorded during threshold detection tasks under various experimental conditions. The data were analyzed for interdependencies between stimulus parameters, detection performance, and oculomotor behaviour.The data demonstrate that under certain conditions, saccadic parameters are adaptive to specific stimulus properties. Further, the data suggest that for stationary patterns with low spatial frequencies and for gratings flickering with high temporal frequencies, detection is facilitated considerably by the occurrence of a saccadic eye movement. These facilitation effects are consistent with the predictions of a theoretical model presented in a previous paper. 相似文献
203.
Heat shock gene expression is regulated during teratocarcinoma cell differentiation and early embryonic development 总被引:11,自引:0,他引:11
Undifferentiated teratocarcinoma stem cells do not express heat shock genes. Solid teratocarcinomas grown in vivo which contain clusters of teratocarcinoma-derived differentiated tissue do respond to heat shock. During mouse embryonic development the expression of heat shock genes is first observed with morula/blastocyst stages of mouse primplantation embryos. 相似文献
204.
205.
R. Heinrich K. Rozwòd N. Elsner 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1998,183(3):389-399
In gomphocerine grasshoppers the neuromuscular patterns of stridulatory hindleg movements are produced by metathoracic rhythm
generators under the control of cephalic command neurons. Injections of cholinergic agonists into the protocerebrum activate
this command system which induces the performance of stridulatory sequences, resembling natural species specific movements.
Injections of GABA, glycine and picrotoxin into the central protocerebrum of the species Omocestus viridulus, Chorthippus mollis and Ch. biguttulus revealed a contribution of inhibitory mechanisms to the control of the stridulatory behaviour. The experiments suggest that
inhibition interferes with the cephalic command systems at three levels: (1) sustained inhibition through picrotoxin sensitive
receptors acting on all command units while grasshoppers are at rest, and during stridulation on all command units except
the one activating the pattern generators of the currently performed movements; (2) premature termination of song sequences,
experimentally induced by injections of GABA and glycine; and (3) coupling of a timing mechanism that terminates a song sequence
or its subunits with a particular movement pattern after specific durations. These results together with those from previous
studies on the pharmacological activation of stridulatory behaviour suggest that a balance of inhibitory and excitatory inputs
to the command system selects the appropriate song type and controls its performance.
Accepted: 11 June 1998 相似文献