Flory R K, Smith C T
Physiol Behav. 1983 Jan;30(1):11-8. doi: 10.1016/0031-9384(83)90031-8.
Pigeons exposed to a 180-sec fixed-time food schedule could attack a rear-projected conspecific target that was available either (a) continuously throughout the interfood interval, (b) randomly during one 30-sec portion of each interfood interval, or (c) during the final 90 sec of each interval. During continuous-target availability, attack was maximal shortly after food ingestion and progressively decreased thereafter. During random-target availability, five of seven pigeons attacked less per target-access period the later that period occurred within the interfood interval, whereas two subjects exhibited relatively high local attack rates even when access periods occurred within the final third of the interval. When the target was available only during the second half of the interfood interval, attack occurred as soon as the target was presented and progressively decreased throughout the remainder of the target-access period. In general, these results show that schedule-induced attack can be increased by limiting the availability of that target and also indicate that such attack can reliably occur at times other than shortly after food delivery.
暴露于180秒定时进食计划的鸽子会攻击后投射的同种目标，该目标在进食间隔期间可处于以下三种情况之一：(a) 在整个进食间隔期间持续出现；(b) 在每个进食间隔的一个30秒时间段内随机出现；(c) 在每个间隔的最后90秒出现。在目标持续出现的情况下，进食后不久攻击行为最为强烈，之后逐渐减少。在目标随机出现的情况下，七个鸽子中有五个在进食间隔内目标出现的时间越晚，每个目标出现期间的攻击次数就越少，而另外两个受试者即使在间隔的最后三分之一时间内出现目标，也表现出相对较高的局部攻击率。当目标仅在进食间隔的后半段出现时，目标一出现就会发生攻击，并在目标出现的剩余时间内逐渐减少。总的来说，这些结果表明，通过限制目标的出现时间可以增加由时间表诱导的攻击行为，并且还表明这种攻击行为可以在食物投递后不久之外的其他时间可靠地发生。
