Other context effects in relation to pitch perception have been reported. Chambers and Pressnitzer (2014) used Shepard tones (Shepard 1964) separated by a tritone and showed that the perception of the direction of a pitch change from one complex tone to the next could be strongly influenced by the recent history of tones heard. Houtgast (1976) showed that a single harmonic could give rise to the perception of a subharmonic low pitch when it was preceded by a complex tone of similar pitch with many harmonics and both were presented in a noise background at a low signal-to-noise ratio (but see Burns and Houtsma 1999). Effects of pitch priming on the salience of pitch have also been reported. Presentation of a tone with a salient pitch indicating “what to listen for” can improve the perceptual representation and/or the discrimination of high pass filtered iterated rippled noises whose pitch is weak (Butler and Trainor 2013). Also, when discriminating between the frequencies of a very short or a noise-like tone and a longer tone with a more salient pitch, performance is better when the longer tone with the more salient pitch is presented first rather than second in the sequence (Demany et al. 2016).