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Research Article

Affect 4.0

A Free Software Package for Implementing Psychological and Psychophysiological Experiments

Published Online:https://doi.org/10.1027/1618-3169/a000005

We describe Affect 4.0, a user-friendly software package for implementing psychological and psychophysiological experiments. Affect 4.0 can be used to present visual, acoustic, and/or tactile stimuli in highly complex (i.e., semirandomized and response-contingent) sequences. Affect 4.0 is capable of registering response latencies and analog behavioral input with millisecond accuracy. Affect 4.0 is available free of charge.

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