Animal Sonar Systems by Donald R. Griffin (auth.), René-Guy Busnel, James F. Fish

By Donald R. Griffin (auth.), René-Guy Busnel, James F. Fish (eds.)

Thirteen years have passed by because the first overseas meet­ ing on Animal Sonar structures used to be held in Frascati, Italy, in 1966. on account that that point, nearly 900 papers were released on its subject matter. the 1st symposium was once important because it was once the start line for brand spanking new learn traces whose aim was once to layout and increase technological structures with homes drawing close optimum organic structures. there were hugely major advancements considering that then in all domain names concerning organic sonar structures and of their appli­ cations to the engineering box. The time had consequently come for a multidisciplinary integration of the data collected, not just at the evolution of structures utilized in animal echolocation, yet on platforms thought, habit and neurobiology, signal-to-noise ratio, protecting, sign processing, and measures saw in convinced species opposed to animal sonar platforms. smooth electronics expertise and platforms idea which were built purely because 1974 now enable designing subtle sonar and radar structures using ideas derived from organic platforms. on the time of the Frascati assembly, built-in circuits and technol­ ogies exploiting computing device technology weren't good adequate built to yield merits now attainable via use of real-time research, resulting in, between different issues, a definition of goal temporal char­ acteristics, as organic sonar platforms may be able to do. All of those new technical advancements necessitate shut co­ operation among engineers and biologists in the framework of recent experiments that have been designed, fairly long ago 5 years.

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Response bias. and the subtle difference between the recognition or discrimination of targets and the detection of targets. Baseline Behavior There have been several measurements of thresholds related to such target parameters as distance. size. resolution. wall thickness, etc. which have resulted in considerably detailed data on the echolocation capabilities of several species of porpoises (see the papers by Moore. Murchison and Nachtigal! in this chapter). In all the psychophysical experiments reviewed, it usually takes months before stable asymptote or baseline is achieved.

Are not reinforced in the absence of a target, or reinforcement may be programmed symmetrically so that it follows "yes" responses in the presence of a target ("hits") and "no" responses in the absence of a target ("correct rejections"). Errors (which may be punished with "time-outs" or other aversive events) are of two types: a "yes" response in the absence of a target ("false alarms") or a "no" response in the presence of a target ("misses"). The go/no go procedure is usually employed when targets or BEHAVIORAL METHODOLOGY IN ECHOLOCATION 17 stimuli are presented sequentially and is thus used most extensively in the earlier stages of training when only a single standard target is presented on repeated trials (Lekomstev and Titov, 1974).

The most frequently occurring response was one in which the turn from station toward the target area at the beginning of a trial was quickly followed by another abrupt turn to the manipulanda. During the course of these rapid observing responses, Sven never swam more than two meters from station and the response latencies were invariably less than four seconds. This observing response occurred most frequently in the presence of both bronze targets and the large steel target. However, about one-quarter of the way through the experiment, Sven began to make a different observing response.

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