Gordon Atkins

Learn More
Phonotactic selectivity of female crickets to natural and model calling songs (CSs) has been well documented. No identified acoustic interneurons or groups of them exhibited sufficiently selective responses to CSs to explain this behavioral selectivity. In this study identified acoustic interneurons were killed and pre- and post-killing phonotactic(More)
1. The response properties of nine prothoracic interneurons in the cricketTeleogryllus oceanicus are described. Two of these (DN1 and TN1) have been studied previously in another species (Wohlers and Huber 1982); the remaining seven are described here for the first time. Four of the neurons (DN1–DN4) have an axon that projects out of the prothoracic(More)
1. When tested with legphone stimulation at 5 and 16 kHz, two prothoracic low-frequency neurons', ON1 and L1 of Acheta domesticus females, receive mainly excitation from one side (soma-ipsilateral in ON1, soma-contralateral in L1) and inhibition from the opposite side as is described for other cricket species (Figs. 2,3). While thresholds at 5 kHz are(More)
1. The phonotactic threshold of 3 to 5-day-old adult female Acheta domesticus and the threshold of the L1 auditory neuron drop progressively (Fig. 1). 2. Application of juvenile hormone III (JHIII) to 1 -day-old females caused both the female's threshold for phonotaxis and the threshold of the L1 auditory neuron to drop 20 or more dB over the next 12 h(More)
1. Inactivating one L1 results in angular errors and circling during orientation toward the side having the intact L1 in response to calling songs (CSs) whose intensities are below the threshold for L3 (Figs. 2, 3A). When song intensities are increased above the threshold of L3, circling decreases (Fig. 3B). 2. Following inactivation of one L1 and occlusion(More)
1. The morphology and response properties of a high-frequency, bilaterally projecting brain neuron (HBB1) is described for the cricketAcheta domestica. 2. HBB1 has processes in several regions of the protocerebrum (Fig. 1), many of which overlap those of L3, an ascending prothoracic interneuron (Fig. 7). 3. HBB1 is most responsive to 16-kHz sounds (Fig. 2),(More)
The longstanding assumption that calves of more than 6 months of age are more resistant to Mycobacterium avium subspecies paratuberculosis (MAP) infection has recently been challenged. In order to elucidate this, a challenge experiment was performed to evaluate age- and dose-dependent susceptibility to MAP infection in dairy calves. Fifty-six calves from(More)
Female crickets (Gryllus pennsylvanicus), caught in the field as nymphs, responded as adults in the laboratory with selective phonotaxis to model calling songs (CSs) that reproduced the dominant carrier frequencies and syllable periods (SPs) characteristic of the male's natural calling song. Extracellular recordings demonstrated two types of auditory(More)
1. L3 is a prothoracic auditory interneuron which has an ascending axon projecting to the brain. It is rather broadly tuned and most sensitive to carrier frequencies around 16 kHz (mean threshold=60 dB) and at 4–5 kHz (mean threshold=70 dB, Fig. 1). 2. During open field stimulation L3's excitatory response increases rather linearly as sound intensity is(More)
1. L3 is an auditory interneuron in the prothoracic ganglion of the cricket, Acheta domesticus. The degree of syllable period (SP) specific decrement to model calling songs is age-specific in L3. In response to calling songs having 50 ms SPs, L3s in old females (23–28 days) exhibit less response decrement than those in young (4 days) females (Figs. 1, 2).(More)