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Monday, November 4, 2013

Elevated Plus Maze and the HVS Image 2014

This week at Society for Neuroscience in San Diego sees a new step forward in elevated plus maze with the launch of HVS Image 2014 and its Elevated Plus Maze modules. As well as the new start of the art fully guided quick set-up and easy calibration, it aims at overcoming some of the ongoing criticisms of EPM  in assessing  'risk assessment' defensive behaviors in rodents and their resemblance to of the behavioral/somatic symptoms of generalized anxiety in humans by focusing on finding the best indicator variables in your analysis. These include internal support for  statistical and methodological procedures to allow compensation for one-trial tolerance (OTT)

Monday, July 1, 2013

What sort of USB cable will work with the HVS Image 2013 Video Trackers?

If the HVS Image system works with your LifeCam but not with an extension lead then its never the HVS Image Software, its always your current extension lead that's the problem. You can prove this for yourself by just using Microsoft's LifeCam software with the camera without the HVS software, If you've bought a turnkey system on a Sony Vaio from HVS Image then it will probably come with a Nikkai 5 meter cable, but in their own development labs HVS Image use these 10 meter USB 2.0 cables. These have great performance and work very well with the Microsoft LifeCams.


  • 10m high speed USB 2.0 extension cable, fully compliant with High speed 2.0 standard.
  • Twisted-Pair construction adopts impedance matching methods to ensure high-speed, error-free data transfer.
  • The foil and braid shielding reduce EMI/RFI signal interference.
  • Built-in signal booster.
  • High speed data transfer rate up to 480Mbps.
  • Plug & Play, hot pluggable.
  • Don't need external power.
  • Standard USB 2.0 Male to Female connectors.
  • Suitable for connecting Microsoft LifeCam to USB.



  • Specifications:
  • Color: Transparent blue
  • Cable length: Approx. 10m / 32ft
  • Connectors: USB 2.0 A Male to A Female
  • Package size: Approx. 18 * 18 * 4cm / 7 * 7 * 1.6in
  • Weight: 357g / 12.6oz
Here is the original OEM supplier but if you are not an OEM you can now get them from these suppliers

  1. Supplier A
  2. Supplier B
  3. Supplier C
If you need to extend further these go up to 30M but have not been tested in the labs.

Saturday, April 13, 2013

How to run Elevated Plus Maze Experiments

How to run Elevated Plus Maze Experiments

If you are using an automated system like HVS Image 2013 you won't need to fill out data sheets, but you should have a Master Experiment Planning File MEPF) with subject number of animal, date, coded condition and experimenter's name set up on the system.

Make sure maze is cleaned and dried before use and that video-tracking system is ready to be used to remove olfactory cues. The open arm is set up vertically in the camera's field of view, the closed or walled arm is horizontal.

Mount the camera firmly in place using a small C-clamp or hot melt glue. (This is for 2013 LifeCam style cameras. If you are using a 2100 or 2020 style system you will have a ceiling mounted photographic camera mount). Use an active USB 2.0 lead if necessary to reach the PC. Clip the cable out of the field of view with cable ties (otherwise if it flaps into view it will get tracked). Calibrate the system using the maze in exactly the position that it will be in when you run the experiment. Set up tracking with exactly the lighting that you will use when running the experiments. Take care to avoid shadows or glare in the tracking area.

Use an individual temporary transport cage to transport the rat or mouse into the behavioral testing room.

Now GENTLY and carefully take the animal out of its transport cage and place at the junction of the open and closed arms, facing upwards in the camera's field of view i.e. pointing along the the open arm opposite to where the experimenter is standing. Always handle your animals consistently and gently to ensure reliable consistent behavior, and place each animal in the elevated plus maze in the same position each time to get consistent, reliable data. Stress will change your animal's behavior[1,2] and ruin your results.

Video of the Elevated Plus Maze in use with a Rat


Friday, February 1, 2013

Open Source 3D Printable Elevated Plus Maze

HVS Image are releasing a full set of Open Source 3D Printable Models of standard lab hardware including Elevated Plus Maze to all of their users through the HVS Image Darwin Group. The idea is that instead of buying expensive, proprietary mazes users will be able to use the 3D .stl designs to get their mazes printed. Currently printers produce components that are a bit small and will need attaching together (HVS have information on that using some current research at Princeton) but bigger commercial printers mitigate the problem substantially. HVS Image say, "this isn't really about *FREE* as in free beer (although the files *are* free to HVS Users. Its about freedom to recreate the exact set-up in other labs, or to modify your maze in exactly the way you want using the .blend files that we provide. These can be edited using the free open source Blender program and then share your designs back to other scientists who can then run their studies using the same designs. It's all experimental at present, but we think it represents a big move forward away from proprietary lab equipment".

Early pre-release shot of the 3D designs
for the elevated plus maze.

Editing the 3D printable Elevated Plus Maze in Blender

HVS Image have already been using 1:12 scale printed models of the mazes to carry out lab set-up planning and lighting planning.

Tuesday, January 22, 2013

Latest Radial Arm, Elevated Plus, T-Maze,Y-Maze

The new HVS Image 2013 can run and analyze custom
maze experiments.

HVS Image have announced a new tracking and analysis module for Elevated Plus Maze as part of the HVS Image 2013. Like the previous HVS Image 2020,2100 and 2012 systems, the 2013 has full backwards compatibility so you will be able to capture and analyze more data yet retain your experiments and user training, but now it's a software package that you can use a generic web cam with  on a standard off the shelf laptop. This keeps performance and ease of use high with the costs kept right down, lower in fact than any of the rival systems.

The HVS Image Plus Maze Module has powerful context sensitive help that allows inexperienced users to be up and running in minutes rather than days. It shares a simplified UI (user interface) with the other new HVS Image 2013 software which also supports Morris Water Maze, T-Maze, Y-Maze, Radial arm and Open Field. We'll post new pictures of the system here as we get them.

Monday, December 17, 2012

Elevated Plus Maze Mashup

These are frames from the new forthcoming "Water Maze" cartoon strip. Give us your versions of the captions in the comments below! Original cartoons (c) HVS Image Software Ltd 2012  

This is the Elevated Plus Maze Mashup! A mashup is where a digital media file containing any or all of text, graphics, audio, video, and animation is recombined and modified to create a derivative work. The original is reproduced with permission from "The Water Maze" with permission from HVS Image Software Ltd. You can reproduce or reuse without permission for non-commercial purposes as long as you link back to this page both with the graphic and with a text link. If you want to see more of these or more originals make sure that you comment here and suggest captions and link back from your own blog or site!

Monday, November 12, 2012

Behaviors in Elevated Plus Mazes

We'd noted that Rats and Mice are observed to behave quite differently when put in the same elevated plus maze. Our rodent guru tells us that while superficially similar norway rats and lab mice, Rattus rattus, and Mus musculus are not even generically similar. Even at quite a coarse scale, norway rats have 22 chromosome pairs, lab mice have 20 (Levan 1991) and the common ancestor is at least 8 million years ago - as far back as humans are separated from Great Apes. The Rat Genome Sequencing Consortium 2004 tells us that Norway rats have 2.75 million base pairs while mice have 2.6 million so we'd expect significant differences.


I'd noted that with the HVS Image 2012 series Elevated Plus Maze the physical mazes are actually provided in different sizes for the two animals - for example the width is 50mm in the HVS Image Mouse Maze and 100mm in the HVS Image Rat maze so it's possible that its just a question of scaling.