FF - Introduction

The FF program is used for data collection using stimuli that mimic free field conditions over closed earphones.

FF can be started in one of the following ways:

(a) At the DCL prompt:

          $ FF

(b) From within DCP:

          $ DCP
            XP FF

For use during experiments, it recommended that the second method (i.e. start from within DCP) be used. This has many benefits. For one, when you switch between FF and some other data collection program (such as RA), then if both are started by DCP the program switching will be much faster, since the programs stay in memory even when inactive.

The other important benefit of starting from DCP is that many FF parameters can be specified via DCP commands. For example:

          $ DCP
            MODE FF
            SET CNODE CORTEX
            SET SPIKE CHAN 0 4 5
            XP FF

The commands above can be stored in macro, so (e.g.) the above could be shortened to:

          $ DCP
            EM MULTIFF

where MULTIFF.MCO is the file that contains the relevant DCP commands.