Category: Stimuli

Operant Box for Auditory Tasks (OBAT)

June 2, 2017

Mariana de Araújo has shared the following regarding OBAT, an operant box designed for auditory tasks developed at the Edmond and Lily Safra International Institute of Neuroscience, Santos Dumont Institute, Macaiba, Brazil. 


Fig. 1
Overview of the OBAT, inside the sound-attenuating chamber with the door open. External sources of heating were left outside the chamber: (a) Arduino Mega 2560 and shields and (b) the power amplifier. The modules controlling sound delivery, the response bars, and reward delivery can be seen in this lateral view: (c) speaker, (d) retractable bars, (e) reward delivery system, and (f) reward dispenser. The animal was kept inside the (g) Plexiglas chamber, and monitored by an (h) internal camera mounted on the wall of the (i) sound isolation chamber

OBAT is a low cost operant box designed to train small primates in auditory tasks. The device presents auditory stimuli via a MP3 player shield connected to an Arduino Mega 2560 through an intermediate, custom-made shield. It also controls two touch-sensitive bars and a reward delivery system. A Graphical User Interface allows the experimenter to easily set the parameters of the experimental sessions. All board schematics, source code, equipment specification and design are available at GitHub and at the publication. Despite its low cost, OBAT has a high temporal accuracy and reliably sends TTL signals to other equipment. Finally, the device was tested with one marmoset, showing that it can successfully be used to train these animals in an auditory two-choice task.


Ribeiro MW, Neto JFR, Morya E, Brasil FL, de Araújo MFP (2017) OBAT: An open-source and low- cost operant box for auditory discriminative tasksBehav Res Methods. doi: 10.3758/s13428-017-0906-6

Visual Stimuli Presentation Device

This apparatus is designed to present complex visual stimuli in rodent behavioral experiments, such as visual discrimination tasks, or visually guided choice paradigms. This low-cost device utilizes an Arduino Uno microcontroller, and three (green) 8×8 LED matrices to present a montage of visual cues across a behavioral arena. Diffusion filters were used to decrease the luminance of the visual cues in order to render them more suitable for rodent visual discrimination. The present design incorporates three light displays to be mounted above three choice ports (nose pokes, levers, etc.); however as many as 8 light displays can be controlled by a single Arduino. This flexible device can be programmed to display a multitude of distinct static and dynamic visual cues, can easily be integrated into an existing behavioral chamber, and seamlessly interface with commercial systems such as MedPC. The wiring diagram and schematic below detail the configuration of this apparatus in a MedPC-based system; however, this device can be controlled by any comparable system, TTL signal, or other device in a behavioral chamber.

SchematicWiring Diagram

Adafruit provides extensive documentation on assembly and programming of these components on their website.

Please contact openbehavior@gmail.com for Arduino source code and the 3D design files of the mounts used to install this device into a behavioral chamber.