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Обычно скорпион старается избегать угрожающих ситуаций. Но, если потревожить его достаточно сильно, он поднимает брюшко и, круто изогнув «хвост» с выступающим жалом над головой, направляет его в сторону источника раздражения. Любые колебания субстрата в это время заставляют его энергично поворачиваться в сторону, откуда идет сигнал, — точно так же, как при охоте, только без продвижения вперед.

Ряд простых опытов подтвердил наше предположение о том, что поведенческие реакции скорпиона, в которых проявляется его способность ориентироваться, не связаны ни со зрительной, ни со слуховой стимуляцией. Когда все восемь глаз скорпиона замазывали непрозрачной краской, не отмечалось никаких изменений ни в чувствительности его к угрожающим сигналам, ни в точности, с которой он поворачивался в ответ на эти сигналы. Не влияли на защитную реакцию животного и звукопоглощающие пластинки, которые мы помешали между скорпионом и источником сигналов. Иная картина складывалась, если в субстрате (песке) создавали воздушную прослойку, блокировавшую распространение в нем механических колебаний. Повеление животного изменялось, хотя эта прослойка не влияла на зрительные и слуховые стимулы. Когда «раздраженного» скорпиона помещали по одну сторону от воздушной преграды, а сигнал подавался по другую сторону, скорпион никак не реагировал, лаже если расстояние до источника сигнала не превышало нескольких сантиметров. Однако, если скорпион хотя бы одной ногой касался субстрата на той стороне, где возникал сигнал, животное немедленно поворачивалось в этом направлении. Так было показано, что для восприятия сигнала скорпиону необходимо иметь механический контакт с возмущенным, т.е. испытавшим воздействие, субстратом. Далее оказалось, что при проявлении защитной реакции угол, на который поворачивается скорпион, зависит исключительно от того, какими ногами он касается возмущенной поверхности. Например, когда все правые ноги скорпиона находились по одну сторону от воздушной прослойки, а все левые ноги — по другую, прикосновения к песку в различных точках с левой стороны от животного всегда вызывали поворот налево, но по сравнению с правильным направлением скорпион сильно отклонялся к перпендикуляру к преграде. В этом случае из-за воздушной прослойки чувствительность скорпиона к сигналам не уменьшалась, но снижалась точность, с которой животное устанавливало направление на источник колебаний.

 

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