Abstract

Currently, there is a need to develop technology that facilitates and improves detection dog research. The aim of this research was to develop an automated computer-driven olfactory line-up task. The apparatus consisted of three olfactometers. Each olfactometer was equipped with flow meters to regulate air flow and dilution and six solenoid valves connected to odor jars. Each olfactometer generated an odor which was carried to an odor port where the dogs sample it. The olfactometer's valves were activated by a microcontroller, and a Python program was built to control each olfactometer and randomize and balance the odor presentation. Dogs (N = 12) received one or two 40-trial training sessions in a day where they progressed through a series of training phases where they learned to detect and alert to double-base smokeless powder (SP). An “alert” consisted of a 4-s nose hold. This was measured by infrared sensors in the ports. For each trial, the apparatus recorded dogs' search latency, sniff time, port entries, and response. All this information was automatically recorded in a csv file. A photoionization detector (PID) and solid-phase microextraction followed by gas chromatography-mass spectrometry (SPME-GC/MS) were used to evaluate the odor dynamics and to instrumentally verify odor presence and clearance. A control test was conducted at the end of the training to ensure dogs were alerting exclusively to the odorant. All 12 dogs readily learned to operate the apparatus within 23 days, and all exceeded 85% accuracy. Control tests indicated dogs were leveraging only olfactory cues and not unintentional cues such as auditory cues from the apparatus. Analytical data showed that odor was detected in the port immediately after the activation of a valve and that odor clearance occurred immediately after the valve was closed. The apparatus developed was easy to operate by the dogs and allowed substantial data collection using double-blind testing procedures in a very short period at an affordable cost point for research equipment (~$5,000 USD). The apparatus may prove to be a useful research tool to provide optimal odor stimuli control, ensure double-blind conditions, reduce labor, and significantly increase the amount of data collected.

Highlights

  • Detection dogs’ broad and important use for homeland security and military applications highlights the need for research and development in detection dog proficiency assessments and training

  • Bruce and Maxine learned the task with the hotdog in only 2 and 1 day, respectively, as they were already familiarized with the equipment

  • Return to phase 1: food consisted of giving dogs 10 trials with hotdog as the target odor before starting the session with smokeless powder (SP) to initiate search with the apparatus

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Summary

Introduction

Detection dogs’ broad and important use for homeland security and military applications highlights the need for research and development in detection dog proficiency assessments and training. Detection dogs are frequently tested in “line-up” procedures or “odor recognition tests” in which a series of items (suitcases, paint cans, etc.) are placed in a line or circle and the dog is asked to search them. Such procedures are frequently used for research as well [3,4,5,6,7]. The development of an automated system with these capabilities will ensure double-blind conditions, maximize data collection, and reduce labor. This will result in more accurate and reliable data in detection dog research

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