Two-Choice TTL Interface
24 events · BNC-6 multi-channel · 4 chambers
Overview
The Two-Choice TTL interface supports two-alternative forced choice (2AFC) paradigms with 6 event types per chamber across 4 chambers. Records trial onset, left choice, right choice, correct reward delivery, incorrect punishment, and timeout events for signal detection and discrimination tasks.
The complex 9-byte protocol with BNC-6 output enables separate recording channels for stimulus-response events, making it straightforward to align choice behavior with prefrontal, striatal, or sensory cortical recordings.
Setup Instructions
- Connect the TTL module via USB. Note COM port.
- Select BNC-6 connector in ConductMaze > TTL Settings.
- Wire BNC channels: Ch1 = trial, Ch2 = left choice, Ch3 = right choice, Ch4 = infusion, Ch5 = reward, Ch6 = punishment.
- Configure stimulus parameters and choice timeout in protocol settings.
- Test each response port to verify correct channel mapping.
Common Pitfalls
- ⚠Response latencies in 2AFC tasks can be very short (200-500ms). Ensure your recording system timestamps TTL events with sufficient precision to distinguish response from outcome events.
- ⚠In correction trials (repeated presentation after errors), the same trial start signal fires multiple times for the same stimulus — track trial type in ConductMaze logs for disambiguation.
Methods Text (Copy-Paste)
Two-choice behavioral events were synchronized using the ConductMaze TTL module (ConductScience, Skokie, IL) with BNC-6 output. Six event types per chamber (trial onset, left/right choices, infusion, reward, punishment) were transmitted as 9-byte frames at 115,200 baud with 10ms resolution.
Suggested text for the Methods section of your manuscript.
Compatible Products
ME-OC-TTLME-OC-BASE
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